Speed up the initial loading of Privacy Browser.
[PrivacyBrowser.git] / app / src / main / java / com / stoutner / privacybrowser / activities / MainWebViewActivity.java
index 1ced078..895f20a 100644 (file)
@@ -24,7 +24,6 @@ package com.stoutner.privacybrowser.activities;
 import android.Manifest;
 import android.annotation.SuppressLint;
 import android.app.Activity;
-import android.app.DialogFragment;
 import android.app.DownloadManager;
 import android.app.SearchManager;
 import android.content.ActivityNotFoundException;
@@ -37,7 +36,6 @@ import android.content.IntentFilter;
 import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.content.res.Configuration;
-import android.content.res.Resources;
 import android.database.Cursor;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
@@ -47,7 +45,6 @@ import android.graphics.drawable.Drawable;
 import android.net.Uri;
 import android.net.http.SslCertificate;
 import android.net.http.SslError;
-import android.os.AsyncTask;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Environment;
@@ -55,25 +52,6 @@ import android.os.Handler;
 import android.preference.PreferenceManager;
 import android.print.PrintDocumentAdapter;
 import android.print.PrintManager;
-import android.support.annotation.NonNull;
-import android.support.design.widget.CoordinatorLayout;
-import android.support.design.widget.FloatingActionButton;
-import android.support.design.widget.NavigationView;
-import android.support.design.widget.Snackbar;
-import android.support.v4.app.ActivityCompat;
-import android.support.v4.content.ContextCompat;
-// `ShortcutInfoCompat`, `ShortcutManagerCompat`, and `IconCompat` can be switched to the non-compat version once API >= 26.
-import android.support.v4.content.pm.ShortcutInfoCompat;
-import android.support.v4.content.pm.ShortcutManagerCompat;
-import android.support.v4.graphics.drawable.IconCompat;
-import android.support.v4.view.GravityCompat;
-import android.support.v4.widget.DrawerLayout;
-import android.support.v4.widget.SwipeRefreshLayout;
-import android.support.v7.app.ActionBar;
-import android.support.v7.app.ActionBarDrawerToggle;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.app.AppCompatDialogFragment;
-import android.support.v7.widget.Toolbar;
 import android.text.Editable;
 import android.text.Spanned;
 import android.text.TextWatcher;
@@ -93,7 +71,6 @@ import android.webkit.CookieManager;
 import android.webkit.HttpAuthHandler;
 import android.webkit.SslErrorHandler;
 import android.webkit.ValueCallback;
-import android.webkit.WebBackForwardList;
 import android.webkit.WebChromeClient;
 import android.webkit.WebResourceResponse;
 import android.webkit.WebSettings;
@@ -113,40 +90,63 @@ import android.widget.RadioButton;
 import android.widget.RelativeLayout;
 import android.widget.TextView;
 
+import androidx.annotation.NonNull;
+import androidx.appcompat.app.ActionBar;
+import androidx.appcompat.app.ActionBarDrawerToggle;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.appcompat.widget.Toolbar;
+import androidx.coordinatorlayout.widget.CoordinatorLayout;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
+import androidx.core.view.GravityCompat;
+import androidx.drawerlayout.widget.DrawerLayout;
+import androidx.fragment.app.DialogFragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
+import androidx.viewpager.widget.ViewPager;
+
+import com.google.android.material.appbar.AppBarLayout;
+import com.google.android.material.floatingactionbutton.FloatingActionButton;
+import com.google.android.material.navigation.NavigationView;
+import com.google.android.material.snackbar.Snackbar;
+import com.google.android.material.tabs.TabLayout;
+
 import com.stoutner.privacybrowser.BuildConfig;
 import com.stoutner.privacybrowser.R;
+import com.stoutner.privacybrowser.adapters.WebViewPagerAdapter;
+import com.stoutner.privacybrowser.asynctasks.GetHostIpAddresses;
+import com.stoutner.privacybrowser.asynctasks.PopulateBlocklists;
 import com.stoutner.privacybrowser.dialogs.AdConsentDialog;
 import com.stoutner.privacybrowser.dialogs.CreateBookmarkDialog;
 import com.stoutner.privacybrowser.dialogs.CreateBookmarkFolderDialog;
 import com.stoutner.privacybrowser.dialogs.CreateHomeScreenShortcutDialog;
+import com.stoutner.privacybrowser.dialogs.DownloadFileDialog;
 import com.stoutner.privacybrowser.dialogs.DownloadImageDialog;
 import com.stoutner.privacybrowser.dialogs.DownloadLocationPermissionDialog;
 import com.stoutner.privacybrowser.dialogs.EditBookmarkDialog;
 import com.stoutner.privacybrowser.dialogs.EditBookmarkFolderDialog;
 import com.stoutner.privacybrowser.dialogs.HttpAuthenticationDialog;
-import com.stoutner.privacybrowser.dialogs.PinnedMismatchDialog;
+import com.stoutner.privacybrowser.dialogs.SslCertificateErrorDialog;
 import com.stoutner.privacybrowser.dialogs.UrlHistoryDialog;
 import com.stoutner.privacybrowser.dialogs.ViewSslCertificateDialog;
+import com.stoutner.privacybrowser.fragments.WebViewTabFragment;
 import com.stoutner.privacybrowser.helpers.AdHelper;
-import com.stoutner.privacybrowser.helpers.BlockListHelper;
+import com.stoutner.privacybrowser.helpers.BlocklistHelper;
 import com.stoutner.privacybrowser.helpers.BookmarksDatabaseHelper;
+import com.stoutner.privacybrowser.helpers.CheckPinnedMismatchHelper;
 import com.stoutner.privacybrowser.helpers.DomainsDatabaseHelper;
 import com.stoutner.privacybrowser.helpers.OrbotProxyHelper;
-import com.stoutner.privacybrowser.dialogs.DownloadFileDialog;
-import com.stoutner.privacybrowser.dialogs.SslCertificateErrorDialog;
+import com.stoutner.privacybrowser.views.NestedScrollWebView;
 
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.IOException;
 import java.io.UnsupportedEncodingException;
-import java.lang.ref.WeakReference;
-import java.net.InetAddress;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLDecoder;
 import java.net.URLEncoder;
-import java.net.UnknownHostException;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.HashMap;
@@ -157,131 +157,26 @@ import java.util.Set;
 
 // AppCompatActivity from android.support.v7.app.AppCompatActivity must be used to have access to the SupportActionBar until the minimum API is >= 21.
 public class MainWebViewActivity extends AppCompatActivity implements CreateBookmarkDialog.CreateBookmarkListener, CreateBookmarkFolderDialog.CreateBookmarkFolderListener,
-        CreateHomeScreenShortcutDialog.CreateHomeScreenShortcutListener, DownloadFileDialog.DownloadFileListener, DownloadImageDialog.DownloadImageListener,
-        DownloadLocationPermissionDialog.DownloadLocationPermissionDialogListener, EditBookmarkDialog.EditBookmarkListener, EditBookmarkFolderDialog.EditBookmarkFolderListener,
-        HttpAuthenticationDialog.HttpAuthenticationListener, NavigationView.OnNavigationItemSelectedListener, PinnedMismatchDialog.PinnedMismatchListener,
-        SslCertificateErrorDialog.SslCertificateErrorListener, UrlHistoryDialog.UrlHistoryListener {
-
-    // `darkTheme` is public static so it can be accessed from everywhere.
-    public static boolean darkTheme;
-
-    // `allowScreenshots` is public static so it can be accessed from everywhere.  It is also used in `onCreate()`.
-    public static boolean allowScreenshots;
-
-    // `favoriteIconBitmap` is public static so it can be accessed from `CreateHomeScreenShortcutDialog`, `BookmarksActivity`, `BookmarksDatabaseViewActivity`, `CreateBookmarkDialog`,
-    // `CreateBookmarkFolderDialog`, `EditBookmarkDialog`, `EditBookmarkFolderDialog`, `EditBookmarkDatabaseViewDialog`, and `ViewSslCertificateDialog`.  It is also used in `onCreate()`,
-    // `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onCreateHomeScreenShortcutCreate()`, `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()`, and `applyDomainSettings()`.
-    public static Bitmap favoriteIconBitmap;
-
-    // `favoriteIconDefaultBitmap` public static so it can be accessed from `PinnedMismatchDialog`.  It is also used in `onCreate()` and `applyDomainSettings`.
-    public static Bitmap favoriteIconDefaultBitmap;
-
-    // `formattedUrlString` is public static so it can be accessed from `AddDomainDialog`, `BookmarksActivity`, `DomainSettingsFragment`, `CreateBookmarkDialog`, and `PinnedMismatchDialog`.
-    // It is also used in `onCreate()`, `onOptionsItemSelected()`, `onNavigationItemSelected()`, `onCreateHomeScreenShortcutCreate()`, `loadUrlFromTextBox()`, and `applyProxyThroughOrbot()`.
-    public static String formattedUrlString;
-
-    // `sslCertificate` is public static so it can be accessed from `DomainsActivity`, `DomainsListFragment`, `DomainSettingsFragment`, `PinnedMismatchDialog`, and `ViewSslCertificateDialog`.
-    // It is also used in `onCreate()`.
-    public static SslCertificate sslCertificate;
-
-    // `currentHostIpAddresses` is public static so it can be accessed from `DomainSettingsFragment` and `ViewSslCertificateDialog`.
-    // It is also used in `onCreate()` and `GetHostIpAddresses()`.
-    public static String currentHostIpAddresses;
+        DownloadFileDialog.DownloadFileListener, DownloadImageDialog.DownloadImageListener, DownloadLocationPermissionDialog.DownloadLocationPermissionDialogListener, EditBookmarkDialog.EditBookmarkListener,
+        EditBookmarkFolderDialog.EditBookmarkFolderListener, NavigationView.OnNavigationItemSelectedListener, PopulateBlocklists.PopulateBlocklistsListener, WebViewTabFragment.NewTabListener {
 
     // `orbotStatus` is public static so it can be accessed from `OrbotProxyHelper`.  It is also used in `onCreate()`, `onResume()`, and `applyProxyThroughOrbot()`.
     public static String orbotStatus;
 
-    // `webViewTitle` is public static so it can be accessed from `CreateBookmarkDialog` and `CreateHomeScreenShortcutDialog`.  It is also used in `onCreate()`.
-    public static String webViewTitle;
+    // The WebView pager adapter is accessed from `HttpAuthenticationDialog`, `PinnedMismatchDialog`, and `SslCertificateErrorDialog`.  It is also used in `onCreate()`, `onResume()`, and `addTab()`.
+    public static WebViewPagerAdapter webViewPagerAdapter;
 
-    // `appliedUserAgentString` is public static so it can be accessed from `ViewSourceActivity`.  It is also used in `applyDomainSettings()`.
-    public static String appliedUserAgentString;
-
-    // `reloadOnRestart` is public static so it can be accessed from `SettingsFragment`.  It is also used in `onRestart()`
-    public static boolean reloadOnRestart;
-
-    // `reloadUrlOnRestart` is public static so it can be accessed from `SettingsFragment` and `BookmarksActivity`.  It is also used in `onRestart()`.
+    // The load URL on restart variables are public static so they can be accessed from `BookmarksActivity`.  They are used in `onRestart()`.
     public static boolean loadUrlOnRestart;
+    public static String urlToLoadOnRestart;
 
     // `restartFromBookmarksActivity` is public static so it can be accessed from `BookmarksActivity`.  It is also used in `onRestart()`.
     public static boolean restartFromBookmarksActivity;
 
-    // The block list versions are public static so they can be accessed from `AboutTabFragment`.  They are also used in `onCreate()`.
-    public static String easyListVersion;
-    public static String easyPrivacyVersion;
-    public static String fanboysAnnoyanceVersion;
-    public static String fanboysSocialVersion;
-    public static String ultraPrivacyVersion;
-
-    // The request items are public static so they can be accessed by `BlockListHelper`, `RequestsArrayAdapter`, and `ViewRequestsDialog`.  They are also used in `onCreate()` and `onPrepareOptionsMenu()`.
-    public static List<String[]> resourceRequests;
-    public static String[] whiteListResultStringArray;
-    private int blockedRequests;
-    private int easyListBlockedRequests;
-    private int easyPrivacyBlockedRequests;
-    private int fanboysAnnoyanceListBlockedRequests;
-    private int fanboysSocialBlockingListBlockedRequests;
-    private int ultraPrivacyBlockedRequests;
-    private int thirdPartyBlockedRequests;
-
-    public final static int REQUEST_DISPOSITION = 0;
-    public final static int REQUEST_URL = 1;
-    public final static int REQUEST_BLOCKLIST = 2;
-    public final static int REQUEST_SUBLIST = 3;
-    public final static int REQUEST_BLOCKLIST_ENTRIES = 4;
-    public final static int REQUEST_BLOCKLIST_ORIGINAL_ENTRY = 5;
-
-    public final static int REQUEST_DEFAULT = 0;
-    public final static int REQUEST_ALLOWED = 1;
-    public final static int REQUEST_THIRD_PARTY = 2;
-    public final static int REQUEST_BLOCKED = 3;
-
-    public final static int MAIN_WHITELIST = 1;
-    public final static int FINAL_WHITELIST = 2;
-    public final static int DOMAIN_WHITELIST = 3;
-    public final static int DOMAIN_INITIAL_WHITELIST = 4;
-    public final static int DOMAIN_FINAL_WHITELIST = 5;
-    public final static int THIRD_PARTY_WHITELIST = 6;
-    public final static int THIRD_PARTY_DOMAIN_WHITELIST = 7;
-    public final static int THIRD_PARTY_DOMAIN_INITIAL_WHITELIST = 8;
-
-    public final static int MAIN_BLACKLIST = 9;
-    public final static int INITIAL_BLACKLIST = 10;
-    public final static int FINAL_BLACKLIST = 11;
-    public final static int DOMAIN_BLACKLIST = 12;
-    public final static int DOMAIN_INITIAL_BLACKLIST = 13;
-    public final static int DOMAIN_FINAL_BLACKLIST = 14;
-    public final static int DOMAIN_REGULAR_EXPRESSION_BLACKLIST = 15;
-    public final static int THIRD_PARTY_BLACKLIST = 16;
-    public final static int THIRD_PARTY_INITIAL_BLACKLIST = 17;
-    public final static int THIRD_PARTY_DOMAIN_BLACKLIST = 18;
-    public final static int THIRD_PARTY_DOMAIN_INITIAL_BLACKLIST = 19;
-    public final static int THIRD_PARTY_REGULAR_EXPRESSION_BLACKLIST = 20;
-    public final static int THIRD_PARTY_DOMAIN_REGULAR_EXPRESSION_BLACKLIST = 21;
-    public final static int REGULAR_EXPRESSION_BLACKLIST = 22;
-
-    // `blockAllThirdPartyRequests` is public static so it can be accessed from `RequestsActivity`.
-    // It is also used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, and `applyAppSettings()`
-    public static boolean blockAllThirdPartyRequests;
-
     // `currentBookmarksFolder` is public static so it can be accessed from `BookmarksActivity`.  It is also used in `onCreate()`, `onBackPressed()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`,
     // `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()`, and `loadBookmarksFolder()`.
     public static String currentBookmarksFolder;
 
-    // `domainSettingsDatabaseId` is public static so it can be accessed from `PinnedMismatchDialog`.  It is also used in `onCreate()`, `onOptionsItemSelected()`, and `applyDomainSettings()`.
-    public static int domainSettingsDatabaseId;
-
-    // The pinned variables are public static so they can be accessed from `PinnedMismatchDialog`.  They are also used in `onCreate()` and `applyDomainSettings()`.
-    public static String pinnedSslIssuedToCName;
-    public static String pinnedSslIssuedToOName;
-    public static String pinnedSslIssuedToUName;
-    public static String pinnedSslIssuedByCName;
-    public static String pinnedSslIssuedByOName;
-    public static String pinnedSslIssuedByUName;
-    public static Date pinnedSslStartDate;
-    public static Date pinnedSslEndDate;
-    public static String pinnedHostIpAddresses;
-
     // The user agent constants are public static so they can be accessed from `SettingsFragment`, `DomainsActivity`, and `DomainSettingsFragment`.
     public final static int UNRECOGNIZED_USER_AGENT = -1;
     public final static int SETTINGS_WEBVIEW_DEFAULT_USER_AGENT = 1;
@@ -291,112 +186,48 @@ public class MainWebViewActivity extends AppCompatActivity implements CreateBook
     public final static int DOMAINS_CUSTOM_USER_AGENT = 13;
 
 
-    // `appBar` is used in `onCreate()`, `onOptionsItemSelected()`, `closeFindOnPage()`, `applyAppSettings()`, and `applyProxyThroughOrbot()`.
-    private ActionBar appBar;
-
-    // `navigatingHistory` is used in `onCreate()`, `onNavigationItemSelected()`, `onSslMismatchBack()`, and `applyDomainSettings()`.
-    private boolean navigatingHistory;
-
-    // `drawerLayout` is used in `onCreate()`, `onNewIntent()`, `onBackPressed()`, and `onRestart()`.
-    private DrawerLayout drawerLayout;
-
-    // `rootCoordinatorLayout` is used in `onCreate()` and `applyAppSettings()`.
-    private CoordinatorLayout rootCoordinatorLayout;
-
-    // `mainWebView` is used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, `onNavigationItemSelected()`, `onRestart()`, `onCreateContextMenu()`, `findPreviousOnPage()`,
-    // `findNextOnPage()`, `closeFindOnPage()`, `loadUrlFromTextBox()`, `onSslMismatchBack()`, and `applyProxyThroughOrbot()`.
-    private WebView mainWebView;
-
-    // `fullScreenVideoFrameLayout` is used in `onCreate()` and `onConfigurationChanged()`.
-    private FrameLayout fullScreenVideoFrameLayout;
-
-    // `swipeRefreshLayout` is used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, and `onRestart()`.
-    private SwipeRefreshLayout swipeRefreshLayout;
-
-    // `urlAppBarRelativeLayout` is used in `onCreate()` and `applyDomainSettings()`.
-    private RelativeLayout urlAppBarRelativeLayout;
 
-    // `favoriteIconImageView` is used in `onCreate()` and `applyDomainSettings()`
-    private ImageView favoriteIconImageView;
-
-    // `cookieManager` is used in `onCreate()`, `onOptionsItemSelected()`, and `onNavigationItemSelected()`, `loadUrlFromTextBox()`, `onDownloadImage()`, `onDownloadFile()`, and `onRestart()`.
-    private CookieManager cookieManager;
+    // The current WebView is used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, `onNavigationItemSelected()`, `onRestart()`, `onCreateContextMenu()`, `findPreviousOnPage()`,
+    // `findNextOnPage()`, `closeFindOnPage()`, `loadUrlFromTextBox()`, `onSslMismatchBack()`, `applyProxyThroughOrbot()`, and `applyDomainSettings()`.
+    private NestedScrollWebView currentWebView;
 
     // `customHeader` is used in `onCreate()`, `onOptionsItemSelected()`, `onCreateContextMenu()`, and `loadUrl()`.
     private final Map<String, String> customHeaders = new HashMap<>();
 
-    // `javaScriptEnabled` is also used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, `applyDomainSettings()`, and `updatePrivacyIcons()`.
-    private boolean javaScriptEnabled;
-
-    // `firstPartyCookiesEnabled` is used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, `onDownloadImage()`, `onDownloadFile()`, and `applyDomainSettings()`.
-    private boolean firstPartyCookiesEnabled;
-
-    // `thirdPartyCookiesEnabled` used in `onCreate()`, `onPrepareOptionsMenu()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, and `applyDomainSettings()`.
-    private boolean thirdPartyCookiesEnabled;
-
-    // `domStorageEnabled` is used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, and `applyDomainSettings()`.
-    private boolean domStorageEnabled;
-
-    // `saveFormDataEnabled` is used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, and `applyDomainSettings()`.  It can be removed once the minimum API >= 26.
-    private boolean saveFormDataEnabled;
-
-    // `nightMode` is used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, and  `applyDomainSettings()`.
-    private boolean nightMode;
-
-    // 'homepage' is used in `onCreate()`, `onNavigationItemSelected()`, and `applyProxyThroughOrbot()`.
-    private String homepage;
-
-    // `searchURL` is used in `loadURLFromTextBox()` and `applyProxyThroughOrbot()`.
+    // The search URL is set in `applyProxyThroughOrbot()` and used in `onCreate()`, `onNewIntent()`, `loadURLFromTextBox()`, and `initializeWebView()`.
     private String searchURL;
 
-    // `mainMenu` is used in `onCreateOptionsMenu()` and `updatePrivacyIcons()`.
-    private Menu mainMenu;
+    // The options menu is set in `onCreateOptionsMenu()` and used in `onOptionsItemSelected()`, `updatePrivacyIcons()`, and `initializeWebView()`.
+    private Menu optionsMenu;
 
-    // `refreshMenuItem` is used in `onCreate()` and `onCreateOptionsMenu()`.
-    private MenuItem refreshMenuItem;
-
-    // The blocklist menu items are used in `onCreate()`, `onCreateOptionsMenu()`, and `onPrepareOptionsMenu()`.
-    private MenuItem blocklistsMenuItem;
-    private MenuItem easyListMenuItem;
-    private MenuItem easyPrivacyMenuItem;
-    private MenuItem fanboysAnnoyanceListMenuItem;
-    private MenuItem fanboysSocialBlockingListMenuItem;
-    private MenuItem ultraPrivacyMenuItem;
-    private MenuItem blockAllThirdPartyRequestsMenuItem;
-
-    // The blocklist variables are used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, and `applyAppSettings()`.
-    private boolean easyListEnabled;
-    private boolean easyPrivacyEnabled;
-    private boolean fanboysAnnoyanceListEnabled;
-    private boolean fanboysSocialBlockingListEnabled;
-    private boolean ultraPrivacyEnabled;
+    // The blocklists are populated in `finishedPopulatingBlocklists()` and accessed from `initializeWebView()`.
+    private ArrayList<List<String[]>> easyList;
+    private ArrayList<List<String[]>> easyPrivacy;
+    private ArrayList<List<String[]>> fanboysAnnoyanceList;
+    private ArrayList<List<String[]>> fanboysSocialList;
+    private ArrayList<List<String[]>> ultraPrivacy;
 
     // `webViewDefaultUserAgent` is used in `onCreate()` and `onPrepareOptionsMenu()`.
     private String webViewDefaultUserAgent;
 
-    // `defaultCustomUserAgentString` is used in `onPrepareOptionsMenu()` and `applyDomainSettings()`.
-    private String defaultCustomUserAgentString;
-
-    // `privacyBrowserRuntime` is used in `onCreate()`, `onOptionsItemSelected()`, and `applyAppSettings()`.
-    private Runtime privacyBrowserRuntime;
-
     // `proxyThroughOrbot` is used in `onRestart()`, `onOptionsItemSelected()`, `applyAppSettings()`, and `applyProxyThroughOrbot()`.
     private boolean proxyThroughOrbot;
 
-    // `incognitoModeEnabled` is used in `onCreate()` and `applyAppSettings()`.
+    // The incognito mode is set in `applyAppSettings()` and used in `initializeWebView()`.
     private boolean incognitoModeEnabled;
 
-    // `fullScreenBrowsingModeEnabled` is used in `onCreate()` and `applyAppSettings()`.
+    // The full screen browsing mode tracker is set it `applyAppSettings()` and used in `initializeWebView()`.
     private boolean fullScreenBrowsingModeEnabled;
 
     // `inFullScreenBrowsingMode` is used in `onCreate()`, `onConfigurationChanged()`, and `applyAppSettings()`.
     private boolean inFullScreenBrowsingMode;
 
-    // `hideSystemBarsOnFullscreen` is used in `onCreate()` and `applyAppSettings()`.
-    private boolean hideSystemBarsOnFullscreen;
+    // The app bar trackers are set in `applyAppSettings()` and used in `initializeWebView()`.
+    private boolean hideAppBar;
+    private boolean scrollAppBar;
 
-    // `translucentNavigationBarOnFullscreen` is used in `onCreate()` and `applyAppSettings()`.
-    private boolean translucentNavigationBarOnFullscreen;
+    // The loading new intent tracker is set in `onNewIntent()` and used in `setCurrentWebView()`.
+    private boolean loadingNewIntent;
 
     // `reapplyDomainSettingsOnRestart` is used in `onCreate()`, `onOptionsItemSelected()`, `onNavigationItemSelected()`, `onRestart()`, and `onAddDomain()`, .
     private boolean reapplyDomainSettingsOnRestart;
@@ -407,56 +238,14 @@ public class MainWebViewActivity extends AppCompatActivity implements CreateBook
     // `displayingFullScreenVideo` is used in `onCreate()` and `onResume()`.
     private boolean displayingFullScreenVideo;
 
-    // `downloadWithExternalApp` is used in `onCreate()`, `onCreateContextMenu()`, and `applyDomainSettings()`.
-    private boolean downloadWithExternalApp;
-
-    // `currentDomainName` is used in `onCreate()`, `onOptionsItemSelected()`, `onNavigationItemSelected()`, `onAddDomain()`, and `applyDomainSettings()`.
-    private String currentDomainName;
-
-    // `pinnedDomainSslCertificate` is used in `onCreate()` and `applyDomainSettings()`.
-    private boolean pinnedSslCertificate;
-
-    // `pinnedIpAddress` is used in `onCreate()` and `applyDomainSettings()`.
-    private boolean pinnedIpAddresses;
-
-    // `ignorePinnedDomainInformation` is used in `onCreate()`, `onSslMismatchProceed()`, and `applyDomainSettings()`.
-    private boolean ignorePinnedDomainInformation;
-
     // `orbotStatusBroadcastReceiver` is used in `onCreate()` and `onDestroy()`.
     private BroadcastReceiver orbotStatusBroadcastReceiver;
 
     // `waitingForOrbot` is used in `onCreate()`, `onResume()`, and `applyProxyThroughOrbot()`.
     private boolean waitingForOrbot;
 
-    // `domainSettingsApplied` is used in `prepareOptionsMenu()` and `applyDomainSettings()`.
-    private boolean domainSettingsApplied;
-
-    // `domainSettingsJavaScriptEnabled` is used in `onOptionsItemSelected()` and `applyDomainSettings()`.
-    private Boolean domainSettingsJavaScriptEnabled;
-
-    // `waitingForOrbotHtmlString` is used in `onCreate()` and `applyProxyThroughOrbot()`.
-    private String waitingForOrbotHtmlString;
-
-    // `privateDataDirectoryString` is used in `onCreate()`, `onOptionsItemSelected()`, and `onNavigationItemSelected()`.
-    private String privateDataDirectoryString;
-
-    // `findOnPageLinearLayout` is used in `onCreate()`, `onOptionsItemSelected()`, and `closeFindOnPage()`.
-    private LinearLayout findOnPageLinearLayout;
-
-    // `findOnPageEditText` is used in `onCreate()`, `onOptionsItemSelected()`, and `closeFindOnPage()`.
-    private EditText findOnPageEditText;
-
-    // `displayAdditionalAppBarIcons` is used in `onCreate()` and `onCreateOptionsMenu()`.
-    private boolean displayAdditionalAppBarIcons;
-
-    // `drawerToggle` is used in `onCreate()`, `onPostCreate()`, `onConfigurationChanged()`, `onNewIntent()`, and `onNavigationItemSelected()`.
-    private ActionBarDrawerToggle drawerToggle;
-
-    // `supportAppBar` is used in `onCreate()`, `onOptionsItemSelected()`, and `closeFindOnPage()`.
-    private Toolbar supportAppBar;
-
-    // `urlTextBox` is used in `onCreate()`, `onOptionsItemSelected()`, `loadUrlFromTextBox()`, `loadUrl()`, and `highlightUrlText()`.
-    private EditText urlTextBox;
+    // The action bar drawer toggle is initialized in `onCreate()` and used in `onResume()`.
+    private ActionBarDrawerToggle actionBarDrawerToggle;
 
     // The color spans are used in `onCreate()` and `highlightUrlText()`.
     private ForegroundColorSpan redColorSpan;
@@ -468,31 +257,10 @@ public class MainWebViewActivity extends AppCompatActivity implements CreateBook
     private int drawerHeaderPaddingTop;
     private int drawerHeaderPaddingBottom;
 
-    // `sslErrorHandler` is used in `onCreate()`, `onSslErrorCancel()`, and `onSslErrorProceed`.
-    private SslErrorHandler sslErrorHandler;
-
-    // `httpAuthHandler` is used in `onCreate()`, `onHttpAuthenticationCancel()`, and `onHttpAuthenticationProceed()`.
-    private static HttpAuthHandler httpAuthHandler;
-
-    // `inputMethodManager` is used in `onOptionsItemSelected()`, `loadUrlFromTextBox()`, and `closeFindOnPage()`.
-    private InputMethodManager inputMethodManager;
-
-    // `mainWebViewRelativeLayout` is used in `onCreate()` and `onNavigationItemSelected()`.
-    private RelativeLayout mainWebViewRelativeLayout;
-
-    // `urlIsLoading` is used in `onCreate()`, `onCreateOptionsMenu()`, `loadUrl()`, and `applyDomainSettings()`.
-    private boolean urlIsLoading;
-
     // `bookmarksDatabaseHelper` is used in `onCreate()`, `onDestroy`, `onOptionsItemSelected()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()`,
     // and `loadBookmarksFolder()`.
     private BookmarksDatabaseHelper bookmarksDatabaseHelper;
 
-    // `bookmarksListView` is used in `onCreate()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, and `loadBookmarksFolder()`.
-    private ListView bookmarksListView;
-
-    // `bookmarksTitleTextView` is used in `onCreate()` and `loadBookmarksFolder()`.
-    private TextView bookmarksTitleTextView;
-
     // `bookmarksCursor` is used in `onDestroy()`, `onOptionsItemSelected()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()`, and `loadBookmarksFolder()`.
     private Cursor bookmarksCursor;
 
@@ -505,7 +273,19 @@ public class MainWebViewActivity extends AppCompatActivity implements CreateBook
     // `fileChooserCallback` is used in `onCreate()` and `onActivityResult()`.
     private ValueCallback<Uri[]> fileChooserCallback;
 
-    // The download strings are used in `onCreate()` and `onRequestPermissionResult()`.
+    // The default progress view offsets are set in `onCreate()` and used in `initializeWebView()`.
+    private int defaultProgressViewStartOffset;
+    private int defaultProgressViewEndOffset;
+
+    // The swipe refresh layout top padding is used when exiting full screen browsing mode.  It is used in an inner class in `initializeWebView()`.
+    private int swipeRefreshLayoutPaddingTop;
+
+    // The URL sanitizers are set in `applyAppSettings()` and used in `sanitizeUrl()`.
+    private boolean sanitizeGoogleAnalytics;
+    private boolean sanitizeFacebookClickIds;
+    private boolean sanitizeTwitterAmpRedirects;
+
+    // The download strings are used in `onCreate()`, `onRequestPermissionResult()` and `initializeWebView()`.
     private String downloadUrl;
     private String downloadContentDisposition;
     private long downloadContentLength;
@@ -513,27 +293,23 @@ public class MainWebViewActivity extends AppCompatActivity implements CreateBook
     // `downloadImageUrl` is used in `onCreateContextMenu()` and `onRequestPermissionResult()`.
     private String downloadImageUrl;
 
-    // The user agent variables are used in `onCreate()` and `applyDomainSettings()`.
-    private ArrayAdapter<CharSequence> userAgentNamesArray;
-    private String[] userAgentDataArray;
-
-    // The request codes are used in `onCreate()`, `onCreateContextMenu()`, `onCloseDownloadLocationPermissionDialog()`, and `onRequestPermissionResult()`.
+    // The request codes are used in `onCreate()`, `onCreateContextMenu()`, `onCloseDownloadLocationPermissionDialog()`, `onRequestPermissionResult()`, and `initializeWebView()`.
     private final int DOWNLOAD_FILE_REQUEST_CODE = 1;
     private final int DOWNLOAD_IMAGE_REQUEST_CODE = 2;
 
     @Override
-    // Remove Android Studio's warning about the dangers of using SetJavaScriptEnabled.  The whole premise of Privacy Browser is built around an understanding of these dangers.
-    // Also, remove the warning about needing to override `performClick()` when using an `OnTouchListener` with `WebView`.
-    @SuppressLint({"SetJavaScriptEnabled", "ClickableViewAccessibility"})
-    // Remove Android Studio's warning about deprecations.  The deprecated `getColor()` must be used until API >= 23.
-    @SuppressWarnings("deprecation")
+    // Remove the warning about needing to override `performClick()` when using an `OnTouchListener` with `WebView`.
+    @SuppressLint("ClickableViewAccessibility")
     protected void onCreate(Bundle savedInstanceState) {
+        // Initialize the default preference values the first time the program is run.  `false` keeps this command from resetting any current preferences back to default.
+        PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
+
         // Get a handle for the shared preferences.
         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
 
         // Get the theme and screenshot preferences.
-        darkTheme = sharedPreferences.getBoolean("dark_theme", false);
-        allowScreenshots = sharedPreferences.getBoolean("allow_screenshots", false);
+        boolean darkTheme = sharedPreferences.getBoolean("dark_theme", false);
+        boolean allowScreenshots = sharedPreferences.getBoolean("allow_screenshots", false);
 
         // Disable screenshots if not allowed.
         if (!allowScreenshots) {
@@ -551,4345 +327,5279 @@ public class MainWebViewActivity extends AppCompatActivity implements CreateBook
         super.onCreate(savedInstanceState);
 
         // Set the content view.
-        setContentView(R.layout.main_drawerlayout);
+        setContentView(R.layout.main_framelayout);
+        // Get handles for the views that need to be modified.
+        DrawerLayout drawerLayout = findViewById(R.id.drawerlayout);
+        Toolbar toolbar = findViewById(R.id.toolbar);
+        ViewPager webViewPager = findViewById(R.id.webviewpager);
 
-        // Get a handle for the resources.
-        Resources resources = getResources();
+        // Set the action bar.  `SupportActionBar` must be used until the minimum API is >= 21.
+        setSupportActionBar(toolbar);
 
-        // Get a handle for `inputMethodManager`.
-        inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
+        // Get a handle for the action bar.
+        ActionBar actionBar = getSupportActionBar();
 
-        // `SupportActionBar` from `android.support.v7.app.ActionBar` must be used until the minimum API is >= 21.
-        supportAppBar = findViewById(R.id.app_bar);
-        setSupportActionBar(supportAppBar);
-        appBar = getSupportActionBar();
+        // This is needed to get rid of the Android Studio warning that the action bar might be null.
+        assert actionBar != null;
 
-        // This is needed to get rid of the Android Studio warning that `appBar` might be null.
-        assert appBar != null;
+        // Add the custom layout, which shows the URL text bar.
+        actionBar.setCustomView(R.layout.url_app_bar);
+        actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
 
-        // Add the custom `url_app_bar` layout, which shows the favorite icon and the URL text bar.
-        appBar.setCustomView(R.layout.url_app_bar);
-        appBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
+        // Initially disable the sliding drawers.  They will be enabled once the blocklists are loaded.
+        drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
 
-        // Initialize the foreground color spans for highlighting the URLs.  We have to use the deprecated `getColor()` until API >= 23.
-        redColorSpan = new ForegroundColorSpan(resources.getColor(R.color.red_a700));
-        initialGrayColorSpan = new ForegroundColorSpan(resources.getColor(R.color.gray_500));
-        finalGrayColorSpan = new ForegroundColorSpan(resources.getColor(R.color.gray_500));
+        // Create the hamburger icon at the start of the AppBar.
+        actionBarDrawerToggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.open_navigation_drawer, R.string.close_navigation_drawer);
 
-        // Get a handle for `urlTextBox`.
-        urlTextBox = findViewById(R.id.url_edittext);
+        // Initialize the web view pager adapter.
+        webViewPagerAdapter = new WebViewPagerAdapter(getSupportFragmentManager());
 
-        // Remove the formatting from `urlTextBar` when the user is editing the text.
-        urlTextBox.setOnFocusChangeListener((View v, boolean hasFocus) -> {
-            if (hasFocus) {  // The user is editing the URL text box.
-                // Remove the highlighting.
-                urlTextBox.getText().removeSpan(redColorSpan);
-                urlTextBox.getText().removeSpan(initialGrayColorSpan);
-                urlTextBox.getText().removeSpan(finalGrayColorSpan);
-            } else {  // The user has stopped editing the URL text box.
-                // Move to the beginning of the string.
-                urlTextBox.setSelection(0);
+        // Set the pager adapter on the web view pager.
+        webViewPager.setAdapter(webViewPagerAdapter);
 
-                // Reapply the highlighting.
-                highlightUrlText();
-            }
-        });
+        // Store up to 100 tabs in memory.
+        webViewPager.setOffscreenPageLimit(100);
 
-        // Set the go button on the keyboard to load the URL in `urlTextBox`.
-        urlTextBox.setOnKeyListener((View v, int keyCode, KeyEvent event) -> {
-            // If the event is a key-down event on the `enter` button, load the URL.
-            if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {
-                // Load the URL into the mainWebView and consume the event.
-                loadUrlFromTextBox();
+        // Populate the blocklists.
+        new PopulateBlocklists(this, this).execute();
+    }
 
-                // If the enter key was pressed, consume the event.
-                return true;
-            } else {
-                // If any other key was pressed, do not consume the event.
-                return false;
-            }
-        });
+    @Override
+    protected void onNewIntent(Intent intent) {
+        // Get the information from the intent.
+        String intentAction = intent.getAction();
+        Uri intentUriData = intent.getData();
 
-        // Set `waitingForOrbotHTMLString`.
-        waitingForOrbotHtmlString = "<html><body><br/><center><h1>" + getString(R.string.waiting_for_orbot) + "</h1></center></body></html>";
+        // Determine if this is a web search.
+        boolean isWebSearch = ((intentAction != null) && intentAction.equals(Intent.ACTION_WEB_SEARCH));
 
-        // Initialize `currentDomainName`, `orbotStatus`, and `waitingForOrbot`.
-        currentDomainName = "";
-        orbotStatus = "unknown";
-        waitingForOrbot = false;
+        // Only process the URI if it contains data or it is a web search.  If the user pressed the desktop icon after the app was already running the URI will be null.
+        if (intentUriData != null || isWebSearch) {
+            // Get the shared preferences.
+            SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
 
-        // Create an Orbot status `BroadcastReceiver`.
-        orbotStatusBroadcastReceiver = new BroadcastReceiver() {
-            @Override
-            public void onReceive(Context context, Intent intent) {
-                // Store the content of the status message in `orbotStatus`.
-                orbotStatus = intent.getStringExtra("org.torproject.android.intent.extra.STATUS");
+            // Create a URL string.
+            String url;
 
-                // If Privacy Browser is waiting on Orbot, load the website now that Orbot is connected.
-                if (orbotStatus.equals("ON") && waitingForOrbot) {
-                    // Reset `waitingForOrbot`.
-                    waitingForOrbot = false;
+            // If the intent action is a web search, perform the search.
+            if (isWebSearch) {
+                // Create an encoded URL string.
+                String encodedUrlString;
 
-                    // Load `formattedUrlString
-                    loadUrl(formattedUrlString);
+                // Sanitize the search input and convert it to a search.
+                try {
+                    encodedUrlString = URLEncoder.encode(intent.getStringExtra(SearchManager.QUERY), "UTF-8");
+                } catch (UnsupportedEncodingException exception) {
+                    encodedUrlString = "";
                 }
+
+                // Add the base search URL.
+                url = searchURL + encodedUrlString;
+            } else {  // The intent should contain a URL.
+                // Set the intent data as the URL.
+                url = intentUriData.toString();
             }
-        };
 
-        // Register `orbotStatusBroadcastReceiver` on `this` context.
-        this.registerReceiver(orbotStatusBroadcastReceiver, new IntentFilter("org.torproject.android.intent.action.STATUS"));
+            // Add a new tab if specified in the preferences.
+            if (sharedPreferences.getBoolean("open_intents_in_new_tab", true)) {  // Load the URL in a new tab.
+                // Set the loading new intent flag.
+                loadingNewIntent = true;
 
-        // Get handles for views that need to be accessed.
-        drawerLayout = findViewById(R.id.drawerlayout);
-        rootCoordinatorLayout = findViewById(R.id.root_coordinatorlayout);
-        bookmarksListView = findViewById(R.id.bookmarks_drawer_listview);
-        bookmarksTitleTextView = findViewById(R.id.bookmarks_title_textview);
-        FloatingActionButton launchBookmarksActivityFab = findViewById(R.id.launch_bookmarks_activity_fab);
-        FloatingActionButton createBookmarkFolderFab = findViewById(R.id.create_bookmark_folder_fab);
-        FloatingActionButton createBookmarkFab = findViewById(R.id.create_bookmark_fab);
-        mainWebViewRelativeLayout = findViewById(R.id.main_webview_relativelayout);
-        mainWebView = findViewById(R.id.main_webview);
-        findOnPageLinearLayout = findViewById(R.id.find_on_page_linearlayout);
-        findOnPageEditText = findViewById(R.id.find_on_page_edittext);
-        fullScreenVideoFrameLayout = findViewById(R.id.full_screen_video_framelayout);
-        urlAppBarRelativeLayout = findViewById(R.id.url_app_bar_relativelayout);
-        favoriteIconImageView = findViewById(R.id.favorite_icon);
+                // Add a new tab.
+                addNewTab(url);
+            } else {  // Load the URL in the current tab.
+                // Make it so.
+                loadUrl(url);
+            }
 
-        // Set the bookmarks drawer resources according to the theme.  This can't be done in the layout due to compatibility issues with the `DrawerLayout` support widget.
-        if (darkTheme) {
-            launchBookmarksActivityFab.setImageDrawable(resources.getDrawable(R.drawable.bookmarks_dark));
-            createBookmarkFolderFab.setImageDrawable(resources.getDrawable(R.drawable.create_folder_dark));
-            createBookmarkFab.setImageDrawable(resources.getDrawable(R.drawable.create_bookmark_dark));
-            bookmarksListView.setBackgroundColor(resources.getColor(R.color.gray_850));
-        } else {
-            launchBookmarksActivityFab.setImageDrawable(resources.getDrawable(R.drawable.bookmarks_light));
-            createBookmarkFolderFab.setImageDrawable(resources.getDrawable(R.drawable.create_folder_light));
-            createBookmarkFab.setImageDrawable(resources.getDrawable(R.drawable.create_bookmark_light));
-            bookmarksListView.setBackgroundColor(resources.getColor(R.color.white));
-        }
+            // Get a handle for the drawer layout.
+            DrawerLayout drawerLayout = findViewById(R.id.drawerlayout);
 
-        // Set the launch bookmarks activity FAB to launch the bookmarks activity.
-        launchBookmarksActivityFab.setOnClickListener(v -> {
-            // Create an intent to launch the bookmarks activity.
-            Intent bookmarksIntent = new Intent(getApplicationContext(), BookmarksActivity.class);
+            // Close the navigation drawer if it is open.
+            if (drawerLayout.isDrawerVisible(GravityCompat.START)) {
+                drawerLayout.closeDrawer(GravityCompat.START);
+            }
 
-            // Include the current folder with the `Intent`.
-            bookmarksIntent.putExtra("Current Folder", currentBookmarksFolder);
+            // Close the bookmarks drawer if it is open.
+            if (drawerLayout.isDrawerVisible(GravityCompat.END)) {
+                drawerLayout.closeDrawer(GravityCompat.END);
+            }
+        }
+    }
 
-            // Make it so.
-            startActivity(bookmarksIntent);
-        });
+    @Override
+    public void onRestart() {
+        // Run the default commands.
+        super.onRestart();
 
-        // Set the create new bookmark folder FAB to display an alert dialog.
-        createBookmarkFolderFab.setOnClickListener(v -> {
-            // Show the `CreateBookmarkFolderDialog` `AlertDialog` and name the instance `@string/create_folder`.
-            AppCompatDialogFragment createBookmarkFolderDialog = new CreateBookmarkFolderDialog();
-            createBookmarkFolderDialog.show(getSupportFragmentManager(), resources.getString(R.string.create_folder));
-        });
+        // Make sure Orbot is running if Privacy Browser is proxying through Orbot.
+        if (proxyThroughOrbot) {
+            // Request Orbot to start.  If Orbot is already running no hard will be caused by this request.
+            Intent orbotIntent = new Intent("org.torproject.android.intent.action.START");
 
-        // Set the create new bookmark FAB to display an alert dialog.
-        createBookmarkFab.setOnClickListener(view -> {
-            // Show the `CreateBookmarkDialog` `AlertDialog` and name the instance `@string/create_bookmark`.
-            AppCompatDialogFragment createBookmarkDialog = new CreateBookmarkDialog();
-            createBookmarkDialog.show(getSupportFragmentManager(), resources.getString(R.string.create_bookmark));
-        });
+            // Send the intent to the Orbot package.
+            orbotIntent.setPackage("org.torproject.android");
 
-        // Create a double-tap listener to toggle full-screen mode.
-        final GestureDetector gestureDetector = new GestureDetector(this, new GestureDetector.SimpleOnGestureListener() {
-            // Override `onDoubleTap()`.  All other events are handled using the default settings.
-            @Override
-            public boolean onDoubleTap(MotionEvent event) {
-                if (fullScreenBrowsingModeEnabled) {  // Only process the double-tap if full screen browsing mode is enabled.
-                    // Toggle `inFullScreenBrowsingMode`.
-                    inFullScreenBrowsingMode = !inFullScreenBrowsingMode;
+            // Make it so.
+            sendBroadcast(orbotIntent);
+        }
 
-                    if (inFullScreenBrowsingMode) {  // Switch to full screen mode.
-                        // Hide the `appBar`.
-                        appBar.hide();
+        // Apply the app settings if returning from the Settings activity.
+        if (reapplyAppSettingsOnRestart) {
+            // Reset the reapply app settings on restart tracker.
+            reapplyAppSettingsOnRestart = false;
 
-                        // Hide the banner ad in the free flavor.
-                        if (BuildConfig.FLAVOR.contentEquals("free")) {
-                            // The AdView is destroyed and recreated, which changes the ID, every time it is reloaded to handle possible rotations.
-                            AdHelper.hideAd(findViewById(R.id.adview));
-                        }
+            // Apply the app settings.
+            applyAppSettings();
+        }
 
-                        // Modify the system bars.
-                        if (hideSystemBarsOnFullscreen) {  // Hide everything.
-                            // Remove the translucent overlays.
-                            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
-
-                            // Remove the translucent status bar overlay on the `Drawer Layout`, which is special and needs its own command.
-                            drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
-
-                            /* SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
-                             * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
-                             * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
-                             */
-                            rootCoordinatorLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
-
-                            // Set `rootCoordinatorLayout` to fill the whole screen.
-                            rootCoordinatorLayout.setFitsSystemWindows(false);
-                        } else {  // Hide everything except the status and navigation bars.
-                            // Set `rootCoordinatorLayout` to fit under the status and navigation bars.
-                            rootCoordinatorLayout.setFitsSystemWindows(false);
-
-                            // There is an Android Support Library bug that causes a scrim to print on the right side of the `Drawer Layout` when the navigation bar is displayed on the right of the screen.
-                            if (translucentNavigationBarOnFullscreen) {
-                                // Set the navigation bar to be translucent.
-                                getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
-                            }
-                        }
-                    } else {  // Switch to normal viewing mode.
-                        // Show the `appBar`.
-                        appBar.show();
+        // Apply the domain settings if returning from the settings or domains activity.
+        if (reapplyDomainSettingsOnRestart) {
+            // Reset the reapply domain settings on restart tracker.
+            reapplyDomainSettingsOnRestart = false;
 
-                        // Show the `BannerAd` in the free flavor.
-                        if (BuildConfig.FLAVOR.contentEquals("free")) {
-                            // Reload the ad.  The AdView is destroyed and recreated, which changes the ID, every time it is reloaded to handle possible rotations.
-                            AdHelper.loadAd(findViewById(R.id.adview), getApplicationContext(), getString(R.string.ad_unit_id));
-                        }
+            // Reapply the domain settings for each tab.
+            for (int i = 0; i < webViewPagerAdapter.getCount(); i++) {
+                // Get the WebView tab fragment.
+                WebViewTabFragment webViewTabFragment = webViewPagerAdapter.getPageFragment(i);
 
-                        // Remove the translucent navigation bar flag if it is set.
-                        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
+                // Get the fragment view.
+                View fragmentView = webViewTabFragment.getView();
 
-                        // Add the translucent status flag if it is unset.  This also resets `drawerLayout's` `View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN`.
-                        getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
+                // Only reload the WebViews if they exist.
+                if (fragmentView != null) {
+                    // Get the nested scroll WebView from the tab fragment.
+                    NestedScrollWebView nestedScrollWebView = fragmentView.findViewById(R.id.nestedscroll_webview);
 
-                        // Remove any `SYSTEM_UI` flags from `rootCoordinatorLayout`.
-                        rootCoordinatorLayout.setSystemUiVisibility(0);
+                    // Reset the current domain name so the domain settings will be reapplied.
+                    nestedScrollWebView.resetCurrentDomainName();
 
-                        // Constrain `rootCoordinatorLayout` inside the status and navigation bars.
-                        rootCoordinatorLayout.setFitsSystemWindows(true);
+                    // Reapply the domain settings if the URL is not null, which can happen if an empty tab is active when returning from settings.
+                    if (nestedScrollWebView.getUrl() != null) {
+                        applyDomainSettings(nestedScrollWebView, nestedScrollWebView.getUrl(), false, true);
                     }
-
-                    // Consume the double-tap.
-                    return true;
-                } else { // Do not consume the double-tap because full screen browsing mode is disabled.
-                    return false;
                 }
             }
-        });
+        }
 
-        // Pass all touch events on `mainWebView` through `gestureDetector` to check for double-taps.
-        mainWebView.setOnTouchListener((View v, MotionEvent event) -> {
-            // Call `performClick()` on the view, which is required for accessibility.
-            v.performClick();
+        // Load the URL on restart (used when loading a bookmark).
+        if (loadUrlOnRestart) {
+            // Load the specified URL.
+            loadUrl(urlToLoadOnRestart);
 
-            // Send the `event` to `gestureDetector`.
-            return gestureDetector.onTouchEvent(event);
-        });
+            // Reset the load on restart tracker.
+            loadUrlOnRestart = false;
+        }
 
-        // Update `findOnPageCountTextView`.
-        mainWebView.setFindListener(new WebView.FindListener() {
-            // Get a handle for `findOnPageCountTextView`.
-            final TextView findOnPageCountTextView = findViewById(R.id.find_on_page_count_textview);
+        // Update the bookmarks drawer if returning from the Bookmarks activity.
+        if (restartFromBookmarksActivity) {
+            // Get a handle for the drawer layout.
+            DrawerLayout drawerLayout = findViewById(R.id.drawerlayout);
 
-            @Override
-            public void onFindResultReceived(int activeMatchOrdinal, int numberOfMatches, boolean isDoneCounting) {
-                if ((isDoneCounting) && (numberOfMatches == 0)) {  // There are no matches.
-                    // Set `findOnPageCountTextView` to `0/0`.
-                    findOnPageCountTextView.setText(R.string.zero_of_zero);
-                } else if (isDoneCounting) {  // There are matches.
-                    // `activeMatchOrdinal` is zero-based.
-                    int activeMatch = activeMatchOrdinal + 1;
+            // Close the bookmarks drawer.
+            drawerLayout.closeDrawer(GravityCompat.END);
 
-                    // Build the match string.
-                    String matchString = activeMatch + "/" + numberOfMatches;
+            // Reload the bookmarks drawer.
+            loadBookmarksFolder();
 
-                    // Set `findOnPageCountTextView`.
-                    findOnPageCountTextView.setText(matchString);
-                }
-            }
-        });
+            // Reset `restartFromBookmarksActivity`.
+            restartFromBookmarksActivity = false;
+        }
 
-        // Search for the string on the page whenever a character changes in the `findOnPageEditText`.
-        findOnPageEditText.addTextChangedListener(new TextWatcher() {
-            @Override
-            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
-                // Do nothing.
-            }
+        // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.  This can be important if the screen was rotated.
+        updatePrivacyIcons(true);
+    }
 
-            @Override
-            public void onTextChanged(CharSequence s, int start, int before, int count) {
-                // Do nothing.
-            }
+    // `onResume()` runs after `onStart()`, which runs after `onCreate()` and `onRestart()`.
+    @Override
+    public void onResume() {
+        // Run the default commands.
+        super.onResume();
 
-            @Override
-            public void afterTextChanged(Editable s) {
-                // Search for the text in `mainWebView`.
-                mainWebView.findAllAsync(findOnPageEditText.getText().toString());
-            }
-        });
+        for (int i = 0; i < webViewPagerAdapter.getCount(); i++) {
+            // Get the WebView tab fragment.
+            WebViewTabFragment webViewTabFragment = webViewPagerAdapter.getPageFragment(i);
 
-        // Set the `check mark` button for the `findOnPageEditText` keyboard to close the soft keyboard.
-        findOnPageEditText.setOnKeyListener((v, keyCode, event) -> {
-            if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {  // The `enter` key was pressed.
-                // Hide the soft keyboard.  `0` indicates no additional flags.
-                inputMethodManager.hideSoftInputFromWindow(mainWebView.getWindowToken(), 0);
+            // Get the fragment view.
+            View fragmentView = webViewTabFragment.getView();
 
-                // Consume the event.
-                return true;
-            } else {  // A different key was pressed.
-                // Do not consume the event.
-                return false;
+            // Only resume the WebViews if they exist (they won't when the app is first created).
+            if (fragmentView != null) {
+                // Get the nested scroll WebView from the tab fragment.
+                NestedScrollWebView nestedScrollWebView = fragmentView.findViewById(R.id.nestedscroll_webview);
+
+                // Resume the nested scroll WebView JavaScript timers.
+                nestedScrollWebView.resumeTimers();
+
+                // Resume the nested scroll WebView.
+                nestedScrollWebView.onResume();
             }
-        });
+        }
 
-        // Implement swipe to refresh.
-        swipeRefreshLayout = findViewById(R.id.swiperefreshlayout);
-        swipeRefreshLayout.setOnRefreshListener(() -> mainWebView.reload());
+        // Display a message to the user if waiting for Orbot.
+        if (waitingForOrbot && !orbotStatus.equals("ON")) {
+            // Disable the wide view port so that the waiting for Orbot text is displayed correctly.
+            currentWebView.getSettings().setUseWideViewPort(false);
 
-        // Set the swipe to refresh color according to the theme.
-        if (darkTheme) {
-            swipeRefreshLayout.setColorSchemeResources(R.color.blue_600);
-            swipeRefreshLayout.setProgressBackgroundColorSchemeResource(R.color.gray_850);
-        } else {
-            swipeRefreshLayout.setColorSchemeResources(R.color.blue_700);
+            // Load a waiting page.  `null` specifies no encoding, which defaults to ASCII.
+            currentWebView.loadData("<html><body><br/><center><h1>" + getString(R.string.waiting_for_orbot) + "</h1></center></body></html>", "text/html", null);
         }
 
-        // `DrawerTitle` identifies the `DrawerLayouts` in accessibility mode.
-        drawerLayout.setDrawerTitle(GravityCompat.START, getString(R.string.navigation_drawer));
-        drawerLayout.setDrawerTitle(GravityCompat.END, getString(R.string.bookmarks));
+        if (displayingFullScreenVideo || inFullScreenBrowsingMode) {
+            // Get a handle for the root frame layouts.
+            FrameLayout rootFrameLayout = findViewById(R.id.root_framelayout);
 
-        // Listen for touches on the navigation menu.
-        final NavigationView navigationView = findViewById(R.id.navigationview);
-        navigationView.setNavigationItemSelectedListener(this);
+            // Remove the translucent status flag.  This is necessary so the root frame layout can fill the entire screen.
+            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
 
-        // Get handles for `navigationMenu` and the back and forward menu items.  The menu is zero-based, so items 1, 2, and 3 are the second, third, and fourth entries in the menu.
-        final Menu navigationMenu = navigationView.getMenu();
-        final MenuItem navigationBackMenuItem = navigationMenu.getItem(1);
-        final MenuItem navigationForwardMenuItem = navigationMenu.getItem(2);
-        final MenuItem navigationHistoryMenuItem = navigationMenu.getItem(3);
-        final MenuItem navigationRequestsMenuItem = navigationMenu.getItem(4);
+            /* Hide the system bars.
+             * SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
+             * SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN makes the root frame layout fill the area that is normally reserved for the status bar.
+             * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
+             * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
+             */
+            rootFrameLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
+                    View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+        } else if (BuildConfig.FLAVOR.contentEquals("free")) {  // Resume the adView for the free flavor.
+            // Resume the ad.
+            AdHelper.resumeAd(findViewById(R.id.adview));
+        }
+    }
 
-        // Initialize the bookmarks database helper.  The `0` specifies a database version, but that is ignored and set instead using a constant in `BookmarksDatabaseHelper`.
-        bookmarksDatabaseHelper = new BookmarksDatabaseHelper(this, null, null, 0);
+    @Override
+    public void onPause() {
+        // Run the default commands.
+        super.onPause();
 
-        // Initialize `currentBookmarksFolder`.  `""` is the home folder in the database.
-        currentBookmarksFolder = "";
+        for (int i = 0; i < webViewPagerAdapter.getCount(); i++) {
+            // Get the WebView tab fragment.
+            WebViewTabFragment webViewTabFragment = webViewPagerAdapter.getPageFragment(i);
 
-        // Load the home folder, which is `""` in the database.
-        loadBookmarksFolder();
+            // Get the fragment view.
+            View fragmentView = webViewTabFragment.getView();
 
-        bookmarksListView.setOnItemClickListener((parent, view, position, id) -> {
-            // Convert the id from long to int to match the format of the bookmarks database.
-            int databaseID = (int) id;
+            // Only pause the WebViews if they exist (they won't when the app is first created).
+            if (fragmentView != null) {
+                // Get the nested scroll WebView from the tab fragment.
+                NestedScrollWebView nestedScrollWebView = fragmentView.findViewById(R.id.nestedscroll_webview);
 
-            // Get the bookmark cursor for this ID and move it to the first row.
-            Cursor bookmarkCursor = bookmarksDatabaseHelper.getBookmark(databaseID);
-            bookmarkCursor.moveToFirst();
+                // Pause the nested scroll WebView.
+                nestedScrollWebView.onPause();
 
-            // Act upon the bookmark according to the type.
-            if (bookmarkCursor.getInt(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1) {  // The selected bookmark is a folder.
-                // Store the new folder name in `currentBookmarksFolder`.
-                currentBookmarksFolder = bookmarkCursor.getString(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
+                // Pause the nested scroll WebView JavaScript timers.
+                nestedScrollWebView.pauseTimers();
+            }
+        }
 
-                // Load the new folder.
-                loadBookmarksFolder();
-            } else {  // The selected bookmark is not a folder.
-                // Load the bookmark URL.
-                loadUrl(bookmarkCursor.getString(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_URL)));
+        // Pause the ad or it will continue to consume resources in the background on the free flavor.
+        if (BuildConfig.FLAVOR.contentEquals("free")) {
+            // Pause the ad.
+            AdHelper.pauseAd(findViewById(R.id.adview));
+        }
+    }
 
-                // Close the bookmarks drawer.
-                drawerLayout.closeDrawer(GravityCompat.END);
+    @Override
+    public void onDestroy() {
+        // Unregister the Orbot status broadcast receiver.
+        this.unregisterReceiver(orbotStatusBroadcastReceiver);
+
+        // Close the bookmarks cursor and database.
+        bookmarksCursor.close();
+        bookmarksDatabaseHelper.close();
+
+        // Run the default commands.
+        super.onDestroy();
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        // Inflate the menu.  This adds items to the action bar if it is present.
+        getMenuInflater().inflate(R.menu.webview_options_menu, menu);
+
+        // Store a handle for the options menu so it can be used by `onOptionsItemSelected()` and `updatePrivacyIcons()`.
+        optionsMenu = menu;
+
+        // Set the initial status of the privacy icons.  `false` does not call `invalidateOptionsMenu` as the last step.
+        updatePrivacyIcons(false);
+
+        // Get handles for the menu items.
+        MenuItem toggleFirstPartyCookiesMenuItem = menu.findItem(R.id.toggle_first_party_cookies);
+        MenuItem toggleThirdPartyCookiesMenuItem = menu.findItem(R.id.toggle_third_party_cookies);
+        MenuItem toggleDomStorageMenuItem = menu.findItem(R.id.toggle_dom_storage);
+        MenuItem toggleSaveFormDataMenuItem = menu.findItem(R.id.toggle_save_form_data);  // Form data can be removed once the minimum API >= 26.
+        MenuItem clearFormDataMenuItem = menu.findItem(R.id.clear_form_data);  // Form data can be removed once the minimum API >= 26.
+        MenuItem refreshMenuItem = menu.findItem(R.id.refresh);
+        MenuItem adConsentMenuItem = menu.findItem(R.id.ad_consent);
+
+        // Only display third-party cookies if API >= 21
+        toggleThirdPartyCookiesMenuItem.setVisible(Build.VERSION.SDK_INT >= 21);
+
+        // Only display the form data menu items if the API < 26.
+        toggleSaveFormDataMenuItem.setVisible(Build.VERSION.SDK_INT < 26);
+        clearFormDataMenuItem.setVisible(Build.VERSION.SDK_INT < 26);
+
+        // Disable the clear form data menu item if the API >= 26 so that the status of the main Clear Data is calculated correctly.
+        clearFormDataMenuItem.setEnabled(Build.VERSION.SDK_INT < 26);
+
+        // Only show Ad Consent if this is the free flavor.
+        adConsentMenuItem.setVisible(BuildConfig.FLAVOR.contentEquals("free"));
+
+        // Get the shared preferences.
+        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
+
+        // Get the dark theme and app bar preferences..
+        boolean displayAdditionalAppBarIcons = sharedPreferences.getBoolean("display_additional_app_bar_icons", false);
+        boolean darkTheme = sharedPreferences.getBoolean("dark_theme", false);
+
+        // Set the status of the additional app bar icons.  Setting the refresh menu item to `SHOW_AS_ACTION_ALWAYS` makes it appear even on small devices like phones.
+        if (displayAdditionalAppBarIcons) {
+            toggleFirstPartyCookiesMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
+            toggleDomStorageMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
+            refreshMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
+        } else { //Do not display the additional icons.
+            toggleFirstPartyCookiesMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
+            toggleDomStorageMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
+            refreshMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
+        }
+
+        // Replace Refresh with Stop if a URL is already loading.
+        if (currentWebView != null && currentWebView.getProgress() != 100) {
+            // Set the title.
+            refreshMenuItem.setTitle(R.string.stop);
+
+            // If the icon is displayed in the AppBar, set it according to the theme.
+            if (displayAdditionalAppBarIcons) {
+                if (darkTheme) {
+                    refreshMenuItem.setIcon(R.drawable.close_dark);
+                } else {
+                    refreshMenuItem.setIcon(R.drawable.close_light);
+                }
             }
+        }
 
-            // Close the `Cursor`.
-            bookmarkCursor.close();
-        });
+        // Done.
+        return true;
+    }
 
-        bookmarksListView.setOnItemLongClickListener((parent, view, position, id) -> {
-            // Convert the database ID from `long` to `int`.
-            int databaseId = (int) id;
+    @Override
+    public boolean onPrepareOptionsMenu(Menu menu) {
+        // Get handles for the menu items.
+        MenuItem addOrEditDomain = menu.findItem(R.id.add_or_edit_domain);
+        MenuItem firstPartyCookiesMenuItem = menu.findItem(R.id.toggle_first_party_cookies);
+        MenuItem thirdPartyCookiesMenuItem = menu.findItem(R.id.toggle_third_party_cookies);
+        MenuItem domStorageMenuItem = menu.findItem(R.id.toggle_dom_storage);
+        MenuItem saveFormDataMenuItem = menu.findItem(R.id.toggle_save_form_data);  // Form data can be removed once the minimum API >= 26.
+        MenuItem clearDataMenuItem = menu.findItem(R.id.clear_data);
+        MenuItem clearCookiesMenuItem = menu.findItem(R.id.clear_cookies);
+        MenuItem clearDOMStorageMenuItem = menu.findItem(R.id.clear_dom_storage);
+        MenuItem clearFormDataMenuItem = menu.findItem(R.id.clear_form_data);  // Form data can be removed once the minimum API >= 26.
+        MenuItem blocklistsMenuItem = menu.findItem(R.id.blocklists);
+        MenuItem easyListMenuItem = menu.findItem(R.id.easylist);
+        MenuItem easyPrivacyMenuItem = menu.findItem(R.id.easyprivacy);
+        MenuItem fanboysAnnoyanceListMenuItem = menu.findItem(R.id.fanboys_annoyance_list);
+        MenuItem fanboysSocialBlockingListMenuItem = menu.findItem(R.id.fanboys_social_blocking_list);
+        MenuItem ultraPrivacyMenuItem = menu.findItem(R.id.ultraprivacy);
+        MenuItem blockAllThirdPartyRequestsMenuItem = menu.findItem(R.id.block_all_third_party_requests);
+        MenuItem fontSizeMenuItem = menu.findItem(R.id.font_size);
+        MenuItem swipeToRefreshMenuItem = menu.findItem(R.id.swipe_to_refresh);
+        MenuItem wideViewportMenuItem = menu.findItem(R.id.wide_viewport);
+        MenuItem displayImagesMenuItem = menu.findItem(R.id.display_images);
+        MenuItem nightModeMenuItem = menu.findItem(R.id.night_mode);
+        MenuItem proxyThroughOrbotMenuItem = menu.findItem(R.id.proxy_through_orbot);
 
-            // Find out if the selected bookmark is a folder.
-            boolean isFolder = bookmarksDatabaseHelper.isFolder(databaseId);
+        // Get a handle for the cookie manager.
+        CookieManager cookieManager = CookieManager.getInstance();
 
-            if (isFolder) {
-                // Save the current folder name, which is used in `onSaveEditBookmarkFolder()`.
-                oldFolderNameString = bookmarksCursor.getString(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
+        // Initialize the current user agent string and the font size.
+        String currentUserAgent = getString(R.string.user_agent_privacy_browser);
+        int fontSize = 100;
 
-                // Show the edit bookmark folder `AlertDialog` and name the instance `@string/edit_folder`.
-                AppCompatDialogFragment editFolderDialog = EditBookmarkFolderDialog.folderDatabaseId(databaseId);
-                editFolderDialog.show(getSupportFragmentManager(), resources.getString(R.string.edit_folder));
+        // Set items that require the current web view to be populated.  It will be null when the program is first opened, as `onPrepareOptionsMenu()` is called before the first WebView is initialized.
+        if (currentWebView != null) {
+            // Set the add or edit domain text.
+            if (currentWebView.getDomainSettingsApplied()) {
+                addOrEditDomain.setTitle(R.string.edit_domain_settings);
             } else {
-                // Show the edit bookmark `AlertDialog` and name the instance `@string/edit_bookmark`.
-                AppCompatDialogFragment editBookmarkDialog = EditBookmarkDialog.bookmarkDatabaseId(databaseId);
-                editBookmarkDialog.show(getSupportFragmentManager(), resources.getString(R.string.edit_bookmark));
+                addOrEditDomain.setTitle(R.string.add_domain_settings);
             }
 
-            // Consume the event.
-            return true;
-        });
+            // Get the current user agent from the WebView.
+            currentUserAgent = currentWebView.getSettings().getUserAgentString();
+
+            // Get the current font size from the
+            fontSize = currentWebView.getSettings().getTextZoom();
+
+            // Set the status of the menu item checkboxes.
+            domStorageMenuItem.setChecked(currentWebView.getSettings().getDomStorageEnabled());
+            saveFormDataMenuItem.setChecked(currentWebView.getSettings().getSaveFormData());  // Form data can be removed once the minimum API >= 26.
+            easyListMenuItem.setChecked(currentWebView.isBlocklistEnabled(NestedScrollWebView.EASY_LIST));
+            easyPrivacyMenuItem.setChecked(currentWebView.isBlocklistEnabled(NestedScrollWebView.EASY_PRIVACY));
+            fanboysAnnoyanceListMenuItem.setChecked(currentWebView.isBlocklistEnabled(NestedScrollWebView.FANBOYS_ANNOYANCE_LIST));
+            fanboysSocialBlockingListMenuItem.setChecked(currentWebView.isBlocklistEnabled(NestedScrollWebView.FANBOYS_SOCIAL_BLOCKING_LIST));
+            ultraPrivacyMenuItem.setChecked(currentWebView.isBlocklistEnabled(NestedScrollWebView.ULTRA_PRIVACY));
+            blockAllThirdPartyRequestsMenuItem.setChecked(currentWebView.isBlocklistEnabled(NestedScrollWebView.THIRD_PARTY_REQUESTS));
+            swipeToRefreshMenuItem.setChecked(currentWebView.getSwipeToRefresh());
+            wideViewportMenuItem.setChecked(currentWebView.getSettings().getUseWideViewPort());
+            displayImagesMenuItem.setChecked(currentWebView.getSettings().getLoadsImagesAutomatically());
+            nightModeMenuItem.setChecked(currentWebView.getNightMode());
+
+            // Initialize the display names for the blocklists with the number of blocked requests.
+            blocklistsMenuItem.setTitle(getString(R.string.blocklists) + " - " + currentWebView.getRequestsCount(NestedScrollWebView.BLOCKED_REQUESTS));
+            easyListMenuItem.setTitle(currentWebView.getRequestsCount(NestedScrollWebView.EASY_LIST) + " - " + getString(R.string.easylist));
+            easyPrivacyMenuItem.setTitle(currentWebView.getRequestsCount(NestedScrollWebView.EASY_PRIVACY) + " - " + getString(R.string.easyprivacy));
+            fanboysAnnoyanceListMenuItem.setTitle(currentWebView.getRequestsCount(NestedScrollWebView.FANBOYS_ANNOYANCE_LIST) + " - " + getString(R.string.fanboys_annoyance_list));
+            fanboysSocialBlockingListMenuItem.setTitle(currentWebView.getRequestsCount(NestedScrollWebView.FANBOYS_SOCIAL_BLOCKING_LIST) + " - " + getString(R.string.fanboys_social_blocking_list));
+            ultraPrivacyMenuItem.setTitle(currentWebView.getRequestsCount(NestedScrollWebView.ULTRA_PRIVACY) + " - " + getString(R.string.ultraprivacy));
+            blockAllThirdPartyRequestsMenuItem.setTitle(currentWebView.getRequestsCount(NestedScrollWebView.THIRD_PARTY_REQUESTS) + " - " + getString(R.string.block_all_third_party_requests));
+
+            // Only modify third-party cookies if the API >= 21.
+            if (Build.VERSION.SDK_INT >= 21) {
+                // Set the status of the third-party cookies checkbox.
+                thirdPartyCookiesMenuItem.setChecked(cookieManager.acceptThirdPartyCookies(currentWebView));
+
+                // Enable third-party cookies if first-party cookies are enabled.
+                thirdPartyCookiesMenuItem.setEnabled(cookieManager.acceptCookie());
+            }
 
-        // Get the status bar pixel size.
-        int statusBarResourceId = resources.getIdentifier("status_bar_height", "dimen", "android");
-        int statusBarPixelSize = resources.getDimensionPixelSize(statusBarResourceId);
+            // Enable DOM Storage if JavaScript is enabled.
+            domStorageMenuItem.setEnabled(currentWebView.getSettings().getJavaScriptEnabled());
+        }
 
-        // Get the resource density.
-        float screenDensity = resources.getDisplayMetrics().density;
+        // Set the status of the menu item checkboxes.
+        firstPartyCookiesMenuItem.setChecked(cookieManager.acceptCookie());
+        proxyThroughOrbotMenuItem.setChecked(proxyThroughOrbot);
+
+        // Enable Clear Cookies if there are any.
+        clearCookiesMenuItem.setEnabled(cookieManager.hasCookies());
+
+        // Get the application's private data directory, which will be something like `/data/user/0/com.stoutner.privacybrowser.standard`, which links to `/data/data/com.stoutner.privacybrowser.standard`.
+        String privateDataDirectoryString = getApplicationInfo().dataDir;
+
+        // Get a count of the number of files in the Local Storage directory.
+        File localStorageDirectory = new File (privateDataDirectoryString + "/app_webview/Local Storage/");
+        int localStorageDirectoryNumberOfFiles = 0;
+        if (localStorageDirectory.exists()) {
+            localStorageDirectoryNumberOfFiles = localStorageDirectory.list().length;
+        }
+
+        // Get a count of the number of files in the IndexedDB directory.
+        File indexedDBDirectory = new File (privateDataDirectoryString + "/app_webview/IndexedDB");
+        int indexedDBDirectoryNumberOfFiles = 0;
+        if (indexedDBDirectory.exists()) {
+            indexedDBDirectoryNumberOfFiles = indexedDBDirectory.list().length;
+        }
+
+        // Enable Clear DOM Storage if there is any.
+        clearDOMStorageMenuItem.setEnabled(localStorageDirectoryNumberOfFiles > 0 || indexedDBDirectoryNumberOfFiles > 0);
+
+        // Enable Clear Form Data is there is any.  This can be removed once the minimum API >= 26.
+        if (Build.VERSION.SDK_INT < 26) {
+            // Get the WebView database.
+            WebViewDatabase webViewDatabase = WebViewDatabase.getInstance(this);
+
+            // Enable the clear form data menu item if there is anything to clear.
+            clearFormDataMenuItem.setEnabled(webViewDatabase.hasFormData());
+        }
+
+        // Enable Clear Data if any of the submenu items are enabled.
+        clearDataMenuItem.setEnabled(clearCookiesMenuItem.isEnabled() || clearDOMStorageMenuItem.isEnabled() || clearFormDataMenuItem.isEnabled());
+
+        // Disable Fanboy's Social Blocking List menu item if Fanboy's Annoyance List is checked.
+        fanboysSocialBlockingListMenuItem.setEnabled(!fanboysAnnoyanceListMenuItem.isChecked());
+
+        // Select the current user agent menu item.  A switch statement cannot be used because the user agents are not compile time constants.
+        if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[0])) {  // Privacy Browser.
+            menu.findItem(R.id.user_agent_privacy_browser).setChecked(true);
+        } else if (currentUserAgent.equals(webViewDefaultUserAgent)) {  // WebView Default.
+            menu.findItem(R.id.user_agent_webview_default).setChecked(true);
+        } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[2])) {  // Firefox on Android.
+            menu.findItem(R.id.user_agent_firefox_on_android).setChecked(true);
+        } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[3])) {  // Chrome on Android.
+            menu.findItem(R.id.user_agent_chrome_on_android).setChecked(true);
+        } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[4])) {  // Safari on iOS.
+            menu.findItem(R.id.user_agent_safari_on_ios).setChecked(true);
+        } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[5])) {  // Firefox on Linux.
+            menu.findItem(R.id.user_agent_firefox_on_linux).setChecked(true);
+        } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[6])) {  // Chromium on Linux.
+            menu.findItem(R.id.user_agent_chromium_on_linux).setChecked(true);
+        } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[7])) {  // Firefox on Windows.
+            menu.findItem(R.id.user_agent_firefox_on_windows).setChecked(true);
+        } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[8])) {  // Chrome on Windows.
+            menu.findItem(R.id.user_agent_chrome_on_windows).setChecked(true);
+        } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[9])) {  // Edge on Windows.
+            menu.findItem(R.id.user_agent_edge_on_windows).setChecked(true);
+        } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[10])) {  // Internet Explorer on Windows.
+            menu.findItem(R.id.user_agent_internet_explorer_on_windows).setChecked(true);
+        } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[11])) {  // Safari on macOS.
+            menu.findItem(R.id.user_agent_safari_on_macos).setChecked(true);
+        } else {  // Custom user agent.
+            menu.findItem(R.id.user_agent_custom).setChecked(true);
+        }
+
+        // Instantiate the font size title and the selected font size menu item.
+        String fontSizeTitle;
+        MenuItem selectedFontSizeMenuItem;
+
+        // Prepare the font size title and current size menu item.
+        switch (fontSize) {
+            case 25:
+                fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.twenty_five_percent);
+                selectedFontSizeMenuItem = menu.findItem(R.id.font_size_twenty_five_percent);
+                break;
+
+            case 50:
+                fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.fifty_percent);
+                selectedFontSizeMenuItem = menu.findItem(R.id.font_size_fifty_percent);
+                break;
+
+            case 75:
+                fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.seventy_five_percent);
+                selectedFontSizeMenuItem = menu.findItem(R.id.font_size_seventy_five_percent);
+                break;
+
+            case 100:
+                fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.one_hundred_percent);
+                selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_percent);
+                break;
+
+            case 125:
+                fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.one_hundred_twenty_five_percent);
+                selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_twenty_five_percent);
+                break;
+
+            case 150:
+                fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.one_hundred_fifty_percent);
+                selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_fifty_percent);
+                break;
+
+            case 175:
+                fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.one_hundred_seventy_five_percent);
+                selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_seventy_five_percent);
+                break;
+
+            case 200:
+                fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.two_hundred_percent);
+                selectedFontSizeMenuItem = menu.findItem(R.id.font_size_two_hundred_percent);
+                break;
+
+            default:
+                fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.one_hundred_percent);
+                selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_percent);
+                break;
+        }
+
+        // Set the font size title and select the current size menu item.
+        fontSizeMenuItem.setTitle(fontSizeTitle);
+        selectedFontSizeMenuItem.setChecked(true);
+
+        // Run all the other default commands.
+        super.onPrepareOptionsMenu(menu);
+
+        // Display the menu.
+        return true;
+    }
+
+    @Override
+    // Remove Android Studio's warning about the dangers of using SetJavaScriptEnabled.
+    @SuppressLint("SetJavaScriptEnabled")
+    public boolean onOptionsItemSelected(MenuItem menuItem) {
+        // Reenter full screen browsing mode if it was interrupted by the options menu.  <https://redmine.stoutner.com/issues/389>
+        if (inFullScreenBrowsingMode) {
+            // Remove the translucent status flag.  This is necessary so the root frame layout can fill the entire screen.
+            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
+
+            FrameLayout rootFrameLayout = findViewById(R.id.root_framelayout);
+
+            /* Hide the system bars.
+             * SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
+             * SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN makes the root frame layout fill the area that is normally reserved for the status bar.
+             * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
+             * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
+             */
+            rootFrameLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
+                    View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+        }
+
+        // Get the selected menu item ID.
+        int menuItemId = menuItem.getItemId();
+
+        // Get a handle for the shared preferences.
+        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
+
+        // Get a handle for the cookie manager.
+        CookieManager cookieManager = CookieManager.getInstance();
+
+        // Run the commands that correlate to the selected menu item.
+        switch (menuItemId) {
+            case R.id.toggle_javascript:
+                // Toggle the JavaScript status.
+                currentWebView.getSettings().setJavaScriptEnabled(!currentWebView.getSettings().getJavaScriptEnabled());
+
+                // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
+                updatePrivacyIcons(true);
+
+                // Display a `Snackbar`.
+                if (currentWebView.getSettings().getJavaScriptEnabled()) {  // JavaScrip is enabled.
+                    Snackbar.make(findViewById(R.id.webviewpager), R.string.javascript_enabled, Snackbar.LENGTH_SHORT).show();
+                } else if (cookieManager.acceptCookie()) {  // JavaScript is disabled, but first-party cookies are enabled.
+                    Snackbar.make(findViewById(R.id.webviewpager), R.string.javascript_disabled, Snackbar.LENGTH_SHORT).show();
+                } else {  // Privacy mode.
+                    Snackbar.make(findViewById(R.id.webviewpager), R.string.privacy_mode, Snackbar.LENGTH_SHORT).show();
+                }
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.add_or_edit_domain:
+                if (currentWebView.getDomainSettingsApplied()) {  // Edit the current domain settings.
+                    // Reapply the domain settings on returning to `MainWebViewActivity`.
+                    reapplyDomainSettingsOnRestart = true;
+
+                    // Create an intent to launch the domains activity.
+                    Intent domainsIntent = new Intent(this, DomainsActivity.class);
+
+                    // Add the extra information to the intent.
+                    domainsIntent.putExtra("load_domain", currentWebView.getDomainSettingsDatabaseId());
+                    domainsIntent.putExtra("close_on_back", true);
+                    domainsIntent.putExtra("current_url", currentWebView.getUrl());
+
+                    // Get the current certificate.
+                    SslCertificate sslCertificate = currentWebView.getCertificate();
+
+                    // Check to see if the SSL certificate is populated.
+                    if (sslCertificate != null) {
+                        // Extract the certificate to strings.
+                        String issuedToCName = sslCertificate.getIssuedTo().getCName();
+                        String issuedToOName = sslCertificate.getIssuedTo().getOName();
+                        String issuedToUName = sslCertificate.getIssuedTo().getUName();
+                        String issuedByCName = sslCertificate.getIssuedBy().getCName();
+                        String issuedByOName = sslCertificate.getIssuedBy().getOName();
+                        String issuedByUName = sslCertificate.getIssuedBy().getUName();
+                        long startDateLong = sslCertificate.getValidNotBeforeDate().getTime();
+                        long endDateLong = sslCertificate.getValidNotAfterDate().getTime();
+
+                        // Add the certificate to the intent.
+                        domainsIntent.putExtra("ssl_issued_to_cname", issuedToCName);
+                        domainsIntent.putExtra("ssl_issued_to_oname", issuedToOName);
+                        domainsIntent.putExtra("ssl_issued_to_uname", issuedToUName);
+                        domainsIntent.putExtra("ssl_issued_by_cname", issuedByCName);
+                        domainsIntent.putExtra("ssl_issued_by_oname", issuedByOName);
+                        domainsIntent.putExtra("ssl_issued_by_uname", issuedByUName);
+                        domainsIntent.putExtra("ssl_start_date", startDateLong);
+                        domainsIntent.putExtra("ssl_end_date", endDateLong);
+                    }
+
+                    // Check to see if the current IP addresses have been received.
+                    if (currentWebView.hasCurrentIpAddresses()) {
+                        // Add the current IP addresses to the intent.
+                        domainsIntent.putExtra("current_ip_addresses", currentWebView.getCurrentIpAddresses());
+                    }
+
+                    // Make it so.
+                    startActivity(domainsIntent);
+                } else {  // Add a new domain.
+                    // Apply the new domain settings on returning to `MainWebViewActivity`.
+                    reapplyDomainSettingsOnRestart = true;
+
+                    // Get the current domain
+                    Uri currentUri = Uri.parse(currentWebView.getUrl());
+                    String currentDomain = currentUri.getHost();
+
+                    // Initialize the database handler.  The `0` specifies the database version, but that is ignored and set instead using a constant in `DomainsDatabaseHelper`.
+                    DomainsDatabaseHelper domainsDatabaseHelper = new DomainsDatabaseHelper(this, null, null, 0);
+
+                    // Create the domain and store the database ID.
+                    int newDomainDatabaseId = domainsDatabaseHelper.addDomain(currentDomain);
+
+                    // Create an intent to launch the domains activity.
+                    Intent domainsIntent = new Intent(this, DomainsActivity.class);
+
+                    // Add the extra information to the intent.
+                    domainsIntent.putExtra("load_domain", newDomainDatabaseId);
+                    domainsIntent.putExtra("close_on_back", true);
+                    domainsIntent.putExtra("current_url", currentWebView.getUrl());
+
+                    // Get the current certificate.
+                    SslCertificate sslCertificate = currentWebView.getCertificate();
+
+                    // Check to see if the SSL certificate is populated.
+                    if (sslCertificate != null) {
+                        // Extract the certificate to strings.
+                        String issuedToCName = sslCertificate.getIssuedTo().getCName();
+                        String issuedToOName = sslCertificate.getIssuedTo().getOName();
+                        String issuedToUName = sslCertificate.getIssuedTo().getUName();
+                        String issuedByCName = sslCertificate.getIssuedBy().getCName();
+                        String issuedByOName = sslCertificate.getIssuedBy().getOName();
+                        String issuedByUName = sslCertificate.getIssuedBy().getUName();
+                        long startDateLong = sslCertificate.getValidNotBeforeDate().getTime();
+                        long endDateLong = sslCertificate.getValidNotAfterDate().getTime();
+
+                        // Add the certificate to the intent.
+                        domainsIntent.putExtra("ssl_issued_to_cname", issuedToCName);
+                        domainsIntent.putExtra("ssl_issued_to_oname", issuedToOName);
+                        domainsIntent.putExtra("ssl_issued_to_uname", issuedToUName);
+                        domainsIntent.putExtra("ssl_issued_by_cname", issuedByCName);
+                        domainsIntent.putExtra("ssl_issued_by_oname", issuedByOName);
+                        domainsIntent.putExtra("ssl_issued_by_uname", issuedByUName);
+                        domainsIntent.putExtra("ssl_start_date", startDateLong);
+                        domainsIntent.putExtra("ssl_end_date", endDateLong);
+                    }
+
+                    // Check to see if the current IP addresses have been received.
+                    if (currentWebView.hasCurrentIpAddresses()) {
+                        // Add the current IP addresses to the intent.
+                        domainsIntent.putExtra("current_ip_addresses", currentWebView.getCurrentIpAddresses());
+                    }
+
+                    // Make it so.
+                    startActivity(domainsIntent);
+                }
+                return true;
+
+            case R.id.toggle_first_party_cookies:
+                // Switch the first-party cookie status.
+                cookieManager.setAcceptCookie(!cookieManager.acceptCookie());
+
+                // Store the first-party cookie status.
+                currentWebView.setAcceptFirstPartyCookies(cookieManager.acceptCookie());
+
+                // Update the menu checkbox.
+                menuItem.setChecked(cookieManager.acceptCookie());
+
+                // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
+                updatePrivacyIcons(true);
+
+                // Display a snackbar.
+                if (cookieManager.acceptCookie()) {  // First-party cookies are enabled.
+                    Snackbar.make(findViewById(R.id.webviewpager), R.string.first_party_cookies_enabled, Snackbar.LENGTH_SHORT).show();
+                } else if (currentWebView.getSettings().getJavaScriptEnabled()) {  // JavaScript is still enabled.
+                    Snackbar.make(findViewById(R.id.webviewpager), R.string.first_party_cookies_disabled, Snackbar.LENGTH_SHORT).show();
+                } else {  // Privacy mode.
+                    Snackbar.make(findViewById(R.id.webviewpager), R.string.privacy_mode, Snackbar.LENGTH_SHORT).show();
+                }
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.toggle_third_party_cookies:
+                if (Build.VERSION.SDK_INT >= 21) {
+                    // Switch the status of thirdPartyCookiesEnabled.
+                    cookieManager.setAcceptThirdPartyCookies(currentWebView, !cookieManager.acceptThirdPartyCookies(currentWebView));
+
+                    // Update the menu checkbox.
+                    menuItem.setChecked(cookieManager.acceptThirdPartyCookies(currentWebView));
+
+                    // Display a snackbar.
+                    if (cookieManager.acceptThirdPartyCookies(currentWebView)) {
+                        Snackbar.make(findViewById(R.id.webviewpager), R.string.third_party_cookies_enabled, Snackbar.LENGTH_SHORT).show();
+                    } else {
+                        Snackbar.make(findViewById(R.id.webviewpager), R.string.third_party_cookies_disabled, Snackbar.LENGTH_SHORT).show();
+                    }
+
+                    // Reload the current WebView.
+                    currentWebView.reload();
+                } // Else do nothing because SDK < 21.
+                return true;
+
+            case R.id.toggle_dom_storage:
+                // Toggle the status of domStorageEnabled.
+                currentWebView.getSettings().setDomStorageEnabled(!currentWebView.getSettings().getDomStorageEnabled());
+
+                // Update the menu checkbox.
+                menuItem.setChecked(currentWebView.getSettings().getDomStorageEnabled());
+
+                // Update the privacy icon.  `true` refreshes the app bar icons.
+                updatePrivacyIcons(true);
+
+                // Display a snackbar.
+                if (currentWebView.getSettings().getDomStorageEnabled()) {
+                    Snackbar.make(findViewById(R.id.webviewpager), R.string.dom_storage_enabled, Snackbar.LENGTH_SHORT).show();
+                } else {
+                    Snackbar.make(findViewById(R.id.webviewpager), R.string.dom_storage_disabled, Snackbar.LENGTH_SHORT).show();
+                }
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            // Form data can be removed once the minimum API >= 26.
+            case R.id.toggle_save_form_data:
+                // Switch the status of saveFormDataEnabled.
+                currentWebView.getSettings().setSaveFormData(!currentWebView.getSettings().getSaveFormData());
+
+                // Update the menu checkbox.
+                menuItem.setChecked(currentWebView.getSettings().getSaveFormData());
+
+                // Display a snackbar.
+                if (currentWebView.getSettings().getSaveFormData()) {
+                    Snackbar.make(findViewById(R.id.webviewpager), R.string.form_data_enabled, Snackbar.LENGTH_SHORT).show();
+                } else {
+                    Snackbar.make(findViewById(R.id.webviewpager), R.string.form_data_disabled, Snackbar.LENGTH_SHORT).show();
+                }
+
+                // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
+                updatePrivacyIcons(true);
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.clear_cookies:
+                Snackbar.make(findViewById(R.id.webviewpager), R.string.cookies_deleted, Snackbar.LENGTH_LONG)
+                        .setAction(R.string.undo, v -> {
+                            // Do nothing because everything will be handled by `onDismissed()` below.
+                        })
+                        .addCallback(new Snackbar.Callback() {
+                            @SuppressLint("SwitchIntDef")  // Ignore the lint warning about not handling the other possible events as they are covered by `default:`.
+                            @Override
+                            public void onDismissed(Snackbar snackbar, int event) {
+                                if (event != Snackbar.Callback.DISMISS_EVENT_ACTION) {  // The snackbar was dismissed without the undo button being pushed.
+                                    // Delete the cookies, which command varies by SDK.
+                                    if (Build.VERSION.SDK_INT < 21) {
+                                        cookieManager.removeAllCookie();
+                                    } else {
+                                        cookieManager.removeAllCookies(null);
+                                    }
+                                }
+                            }
+                        })
+                        .show();
+                return true;
+
+            case R.id.clear_dom_storage:
+                Snackbar.make(findViewById(R.id.webviewpager), R.string.dom_storage_deleted, Snackbar.LENGTH_LONG)
+                        .setAction(R.string.undo, v -> {
+                            // Do nothing because everything will be handled by `onDismissed()` below.
+                        })
+                        .addCallback(new Snackbar.Callback() {
+                            @SuppressLint("SwitchIntDef")  // Ignore the lint warning about not handling the other possible events as they are covered by `default:`.
+                            @Override
+                            public void onDismissed(Snackbar snackbar, int event) {
+                                if (event != Snackbar.Callback.DISMISS_EVENT_ACTION) {  // The snackbar was dismissed without the undo button being pushed.
+                                    // Delete the DOM Storage.
+                                    WebStorage webStorage = WebStorage.getInstance();
+                                    webStorage.deleteAllData();
+
+                                    // Initialize a handler to manually delete the DOM storage files and directories.
+                                    Handler deleteDomStorageHandler = new Handler();
+
+                                    // Setup a runnable to manually delete the DOM storage files and directories.
+                                    Runnable deleteDomStorageRunnable = () -> {
+                                        try {
+                                            // Get a handle for the runtime.
+                                            Runtime runtime = Runtime.getRuntime();
+
+                                            // Get the application's private data directory, which will be something like `/data/user/0/com.stoutner.privacybrowser.standard`,
+                                            // which links to `/data/data/com.stoutner.privacybrowser.standard`.
+                                            String privateDataDirectoryString = getApplicationInfo().dataDir;
+
+                                            // A string array must be used because the directory contains a space and `Runtime.exec` will otherwise not escape the string correctly.
+                                            Process deleteLocalStorageProcess = runtime.exec(new String[]{"rm", "-rf", privateDataDirectoryString + "/app_webview/Local Storage/"});
+
+                                            // Multiple commands must be used because `Runtime.exec()` does not like `*`.
+                                            Process deleteIndexProcess = runtime.exec("rm -rf " + privateDataDirectoryString + "/app_webview/IndexedDB");
+                                            Process deleteQuotaManagerProcess = runtime.exec("rm -f " + privateDataDirectoryString + "/app_webview/QuotaManager");
+                                            Process deleteQuotaManagerJournalProcess = runtime.exec("rm -f " + privateDataDirectoryString + "/app_webview/QuotaManager-journal");
+                                            Process deleteDatabasesProcess = runtime.exec("rm -rf " + privateDataDirectoryString + "/app_webview/databases");
+
+                                            // Wait for the processes to finish.
+                                            deleteLocalStorageProcess.waitFor();
+                                            deleteIndexProcess.waitFor();
+                                            deleteQuotaManagerProcess.waitFor();
+                                            deleteQuotaManagerJournalProcess.waitFor();
+                                            deleteDatabasesProcess.waitFor();
+                                        } catch (Exception exception) {
+                                            // Do nothing if an error is thrown.
+                                        }
+                                    };
+
+                                    // Manually delete the DOM storage files after 200 milliseconds.
+                                    deleteDomStorageHandler.postDelayed(deleteDomStorageRunnable, 200);
+                                }
+                            }
+                        })
+                        .show();
+                return true;
+
+            // Form data can be remove once the minimum API >= 26.
+            case R.id.clear_form_data:
+                Snackbar.make(findViewById(R.id.webviewpager), R.string.form_data_deleted, Snackbar.LENGTH_LONG)
+                        .setAction(R.string.undo, v -> {
+                            // Do nothing because everything will be handled by `onDismissed()` below.
+                        })
+                        .addCallback(new Snackbar.Callback() {
+                            @SuppressLint("SwitchIntDef")  // Ignore the lint warning about not handling the other possible events as they are covered by `default:`.
+                            @Override
+                            public void onDismissed(Snackbar snackbar, int event) {
+                                if (event != Snackbar.Callback.DISMISS_EVENT_ACTION) {  // The snackbar was dismissed without the undo button being pushed.
+                                    // Delete the form data.
+                                    WebViewDatabase mainWebViewDatabase = WebViewDatabase.getInstance(getApplicationContext());
+                                    mainWebViewDatabase.clearFormData();
+                                }
+                            }
+                        })
+                        .show();
+                return true;
+
+            case R.id.easylist:
+                // Toggle the EasyList status.
+                currentWebView.enableBlocklist(NestedScrollWebView.EASY_LIST, !currentWebView.isBlocklistEnabled(NestedScrollWebView.EASY_LIST));
+
+                // Update the menu checkbox.
+                menuItem.setChecked(currentWebView.isBlocklistEnabled(NestedScrollWebView.EASY_LIST));
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.easyprivacy:
+                // Toggle the EasyPrivacy status.
+                currentWebView.enableBlocklist(NestedScrollWebView.EASY_PRIVACY, !currentWebView.isBlocklistEnabled(NestedScrollWebView.EASY_PRIVACY));
+
+                // Update the menu checkbox.
+                menuItem.setChecked(currentWebView.isBlocklistEnabled(NestedScrollWebView.EASY_PRIVACY));
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.fanboys_annoyance_list:
+                // Toggle Fanboy's Annoyance List status.
+                currentWebView.enableBlocklist(NestedScrollWebView.FANBOYS_ANNOYANCE_LIST, !currentWebView.isBlocklistEnabled(NestedScrollWebView.FANBOYS_ANNOYANCE_LIST));
+
+                // Update the menu checkbox.
+                menuItem.setChecked(currentWebView.isBlocklistEnabled(NestedScrollWebView.FANBOYS_ANNOYANCE_LIST));
+
+                // Update the staus of Fanboy's Social Blocking List.
+                MenuItem fanboysSocialBlockingListMenuItem = optionsMenu.findItem(R.id.fanboys_social_blocking_list);
+                fanboysSocialBlockingListMenuItem.setEnabled(!currentWebView.isBlocklistEnabled(NestedScrollWebView.FANBOYS_ANNOYANCE_LIST));
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.fanboys_social_blocking_list:
+                // Toggle Fanboy's Social Blocking List status.
+                currentWebView.enableBlocklist(NestedScrollWebView.FANBOYS_SOCIAL_BLOCKING_LIST, !currentWebView.isBlocklistEnabled(NestedScrollWebView.FANBOYS_SOCIAL_BLOCKING_LIST));
+
+                // Update the menu checkbox.
+                menuItem.setChecked(currentWebView.isBlocklistEnabled(NestedScrollWebView.FANBOYS_SOCIAL_BLOCKING_LIST));
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.ultraprivacy:
+                // Toggle the UltraPrivacy status.
+                currentWebView.enableBlocklist(NestedScrollWebView.ULTRA_PRIVACY, !currentWebView.isBlocklistEnabled(NestedScrollWebView.ULTRA_PRIVACY));
+
+                // Update the menu checkbox.
+                menuItem.setChecked(currentWebView.isBlocklistEnabled(NestedScrollWebView.ULTRA_PRIVACY));
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.block_all_third_party_requests:
+                //Toggle the third-party requests blocker status.
+                currentWebView.enableBlocklist(NestedScrollWebView.THIRD_PARTY_REQUESTS, !currentWebView.isBlocklistEnabled(NestedScrollWebView.THIRD_PARTY_REQUESTS));
+
+                // Update the menu checkbox.
+                menuItem.setChecked(currentWebView.isBlocklistEnabled(NestedScrollWebView.THIRD_PARTY_REQUESTS));
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.user_agent_privacy_browser:
+                // Update the user agent.
+                currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[0]);
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.user_agent_webview_default:
+                // Update the user agent.
+                currentWebView.getSettings().setUserAgentString("");
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.user_agent_firefox_on_android:
+                // Update the user agent.
+                currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[2]);
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.user_agent_chrome_on_android:
+                // Update the user agent.
+                currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[3]);
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.user_agent_safari_on_ios:
+                // Update the user agent.
+                currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[4]);
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.user_agent_firefox_on_linux:
+                // Update the user agent.
+                currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[5]);
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.user_agent_chromium_on_linux:
+                // Update the user agent.
+                currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[6]);
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.user_agent_firefox_on_windows:
+                // Update the user agent.
+                currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[7]);
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.user_agent_chrome_on_windows:
+                // Update the user agent.
+                currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[8]);
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.user_agent_edge_on_windows:
+                // Update the user agent.
+                currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[9]);
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.user_agent_internet_explorer_on_windows:
+                // Update the user agent.
+                currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[10]);
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.user_agent_safari_on_macos:
+                // Update the user agent.
+                currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[11]);
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.user_agent_custom:
+                // Update the user agent.
+                currentWebView.getSettings().setUserAgentString(sharedPreferences.getString("custom_user_agent", getString(R.string.custom_user_agent_default_value)));
+
+                // Reload the current WebView.
+                currentWebView.reload();
+                return true;
+
+            case R.id.font_size_twenty_five_percent:
+                currentWebView.getSettings().setTextZoom(25);
+                return true;
+
+            case R.id.font_size_fifty_percent:
+                currentWebView.getSettings().setTextZoom(50);
+                return true;
+
+            case R.id.font_size_seventy_five_percent:
+                currentWebView.getSettings().setTextZoom(75);
+                return true;
+
+            case R.id.font_size_one_hundred_percent:
+                currentWebView.getSettings().setTextZoom(100);
+                return true;
+
+            case R.id.font_size_one_hundred_twenty_five_percent:
+                currentWebView.getSettings().setTextZoom(125);
+                return true;
+
+            case R.id.font_size_one_hundred_fifty_percent:
+                currentWebView.getSettings().setTextZoom(150);
+                return true;
+
+            case R.id.font_size_one_hundred_seventy_five_percent:
+                currentWebView.getSettings().setTextZoom(175);
+                return true;
+
+            case R.id.font_size_two_hundred_percent:
+                currentWebView.getSettings().setTextZoom(200);
+                return true;
+
+            case R.id.swipe_to_refresh:
+                // Toggle the stored status of swipe to refresh.
+                currentWebView.setSwipeToRefresh(!currentWebView.getSwipeToRefresh());
+
+                // Get a handle for the swipe refresh layout.
+                SwipeRefreshLayout swipeRefreshLayout = findViewById(R.id.swiperefreshlayout);
+
+                // Update the swipe refresh layout.
+                if (currentWebView.getSwipeToRefresh()) {  // Swipe to refresh is enabled.
+                    // Only enable the swipe refresh layout if the WebView is scrolled to the top.  It is updated every time the scroll changes.
+                    swipeRefreshLayout.setEnabled(currentWebView.getY() == 0);
+                } else {  // Swipe to refresh is disabled.
+                    // Disable the swipe refresh layout.
+                    swipeRefreshLayout.setEnabled(false);
+                }
+                return true;
+
+            case R.id.wide_viewport:
+                // Toggle the viewport.
+                currentWebView.getSettings().setUseWideViewPort(!currentWebView.getSettings().getUseWideViewPort());
+                return true;
+
+            case R.id.display_images:
+                if (currentWebView.getSettings().getLoadsImagesAutomatically()) {  // Images are currently loaded automatically.
+                    // Disable loading of images.
+                    currentWebView.getSettings().setLoadsImagesAutomatically(false);
+
+                    // Reload the website to remove existing images.
+                    currentWebView.reload();
+                } else {  // Images are not currently loaded automatically.
+                    // Enable loading of images.  Missing images will be loaded without the need for a reload.
+                    currentWebView.getSettings().setLoadsImagesAutomatically(true);
+                }
+                return true;
+
+            case R.id.night_mode:
+                // Toggle night mode.
+                currentWebView.setNightMode(!currentWebView.getNightMode());
+
+                // Enable or disable JavaScript according to night mode, the global preference, and any domain settings.
+                if (currentWebView.getNightMode()) {  // Night mode is enabled, which requires JavaScript.
+                    // Enable JavaScript.
+                    currentWebView.getSettings().setJavaScriptEnabled(true);
+                } else if (currentWebView.getDomainSettingsApplied()) {  // Night mode is disabled and domain settings are applied.  Set JavaScript according to the domain settings.
+                    // Apply the JavaScript preference that was stored the last time domain settings were loaded.
+                    currentWebView.getSettings().setJavaScriptEnabled(currentWebView.getDomainSettingsJavaScriptEnabled());
+                } else {  // Night mode is disabled and domain settings are not applied.  Set JavaScript according to the global preference.
+                    // Apply the JavaScript preference.
+                    currentWebView.getSettings().setJavaScriptEnabled(sharedPreferences.getBoolean("javascript", false));
+                }
+
+                // Update the privacy icons.
+                updatePrivacyIcons(false);
+
+                // Reload the website.
+                currentWebView.reload();
+                return true;
+
+            case R.id.find_on_page:
+                // Get a handle for the views.
+                Toolbar toolbar = findViewById(R.id.toolbar);
+                LinearLayout findOnPageLinearLayout = findViewById(R.id.find_on_page_linearlayout);
+                EditText findOnPageEditText = findViewById(R.id.find_on_page_edittext);
+
+                // Set the minimum height of the find on page linear layout to match the toolbar.
+                findOnPageLinearLayout.setMinimumHeight(toolbar.getHeight());
+
+                // Hide the toolbar.
+                toolbar.setVisibility(View.GONE);
+
+                // Show the find on page linear layout.
+                findOnPageLinearLayout.setVisibility(View.VISIBLE);
+
+                // Display the keyboard.  The app must wait 200 ms before running the command to work around a bug in Android.
+                // http://stackoverflow.com/questions/5520085/android-show-softkeyboard-with-showsoftinput-is-not-working
+                findOnPageEditText.postDelayed(() -> {
+                    // Set the focus on `findOnPageEditText`.
+                    findOnPageEditText.requestFocus();
+
+                    // Get a handle for the input method manager.
+                    InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
+
+                    // Remove the lint warning below that the input method manager might be null.
+                    assert inputMethodManager != null;
+
+                    // Display the keyboard.  `0` sets no input flags.
+                    inputMethodManager.showSoftInput(findOnPageEditText, 0);
+                }, 200);
+                return true;
+
+            case R.id.print:
+                // Get a print manager instance.
+                PrintManager printManager = (PrintManager) getSystemService(Context.PRINT_SERVICE);
+
+                // Remove the lint error below that print manager might be null.
+                assert printManager != null;
+
+                // Create a print document adapter from the current WebView.
+                PrintDocumentAdapter printDocumentAdapter = currentWebView.createPrintDocumentAdapter();
+
+                // Print the document.
+                printManager.print(getString(R.string.privacy_browser_web_page), printDocumentAdapter, null);
+                return true;
+
+            case R.id.add_to_homescreen:
+                // Instantiate the create home screen shortcut dialog.
+                DialogFragment createHomeScreenShortcutDialogFragment = CreateHomeScreenShortcutDialog.createDialog(currentWebView.getTitle(), currentWebView.getUrl(),
+                        currentWebView.getFavoriteOrDefaultIcon());
+
+                // Show the create home screen shortcut dialog.
+                createHomeScreenShortcutDialogFragment.show(getSupportFragmentManager(), getString(R.string.create_shortcut));
+                return true;
+
+            case R.id.view_source:
+                // Create an intent to launch the view source activity.
+                Intent viewSourceIntent = new Intent(this, ViewSourceActivity.class);
+
+                // Add the variables to the intent.
+                viewSourceIntent.putExtra("user_agent", currentWebView.getSettings().getUserAgentString());
+                viewSourceIntent.putExtra("current_url", currentWebView.getUrl());
+
+                // Make it so.
+                startActivity(viewSourceIntent);
+                return true;
+
+            case R.id.share_url:
+                // Setup the share string.
+                String shareString = currentWebView.getTitle() + " – " + currentWebView.getUrl();
+
+                // Create the share intent.
+                Intent shareIntent = new Intent(Intent.ACTION_SEND);
+                shareIntent.putExtra(Intent.EXTRA_TEXT, shareString);
+                shareIntent.setType("text/plain");
+
+                // Make it so.
+                startActivity(Intent.createChooser(shareIntent, getString(R.string.share_url)));
+                return true;
+
+            case R.id.open_with_app:
+                openWithApp(currentWebView.getUrl());
+                return true;
+
+            case R.id.open_with_browser:
+                openWithBrowser(currentWebView.getUrl());
+                return true;
+
+            case R.id.proxy_through_orbot:
+                // Toggle the proxy through Orbot variable.
+                proxyThroughOrbot = !proxyThroughOrbot;
+
+                // Apply the proxy through Orbot settings.
+                applyProxyThroughOrbot(true);
+                return true;
 
-        // Calculate the drawer header padding.  This is used to move the text in the drawer headers below any cutouts.
-        drawerHeaderPaddingLeftAndRight = (int) (15 * screenDensity);
-        drawerHeaderPaddingTop = statusBarPixelSize + (int) (4 * screenDensity);
-        drawerHeaderPaddingBottom = (int) (8 * screenDensity);
+            case R.id.refresh:
+                if (menuItem.getTitle().equals(getString(R.string.refresh))) {  // The refresh button was pushed.
+                    // Reload the current WebView.
+                    currentWebView.reload();
+                } else {  // The stop button was pushed.
+                    // Stop the loading of the WebView.
+                    currentWebView.stopLoading();
+                }
+                return true;
 
-        // The drawer listener is used to update the navigation menu.`
-        drawerLayout.addDrawerListener(new DrawerLayout.DrawerListener() {
-            @Override
-            public void onDrawerSlide(@NonNull View drawerView, float slideOffset) {
-            }
+            case R.id.ad_consent:
+                // Display the ad consent dialog.
+                DialogFragment adConsentDialogFragment = new AdConsentDialog();
+                adConsentDialogFragment.show(getSupportFragmentManager(), getString(R.string.ad_consent));
+                return true;
 
-            @Override
-            public void onDrawerOpened(@NonNull View drawerView) {
-            }
+            default:
+                // Don't consume the event.
+                return super.onOptionsItemSelected(menuItem);
+        }
+    }
 
-            @Override
-            public void onDrawerClosed(@NonNull View drawerView) {
-            }
+    // removeAllCookies is deprecated, but it is required for API < 21.
+    @Override
+    public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
+        // Get the menu item ID.
+        int menuItemId = menuItem.getItemId();
 
-            @Override
-            public void onDrawerStateChanged(int newState) {
-                if ((newState == DrawerLayout.STATE_SETTLING) || (newState == DrawerLayout.STATE_DRAGGING)) {  // A drawer is opening or closing.
-                    // Get handles for the drawer headers.
-                    TextView navigationHeaderTextView = findViewById(R.id.navigationText);
-                    TextView bookmarksHeaderTextView = findViewById(R.id.bookmarks_title_textview);
+        // Get a handle for the shared preferences.
+        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
 
-                    // Apply the navigation header paddings if the view is not null (sometimes it is null if another activity has already started).  This moves the text in the header below any cutouts.
-                    if (navigationHeaderTextView != null) {
-                        navigationHeaderTextView.setPadding(drawerHeaderPaddingLeftAndRight, drawerHeaderPaddingTop, drawerHeaderPaddingLeftAndRight, drawerHeaderPaddingBottom);
-                    }
+        // Run the commands that correspond to the selected menu item.
+        switch (menuItemId) {
+            case R.id.clear_and_exit:
+                // Clear and exit Privacy Browser.
+                clearAndExit();
+                break;
 
-                    // Apply the bookmarks header paddings if the view is not null (sometimes it is null if another activity has already started).  This moves the text in the header below any cutouts.
-                    if (bookmarksHeaderTextView != null) {
-                        bookmarksHeaderTextView.setPadding(drawerHeaderPaddingLeftAndRight, drawerHeaderPaddingTop, drawerHeaderPaddingLeftAndRight, drawerHeaderPaddingBottom);
-                    }
+            case R.id.home:
+                // Select the homepage based on the proxy through Orbot status.
+                if (proxyThroughOrbot) {
+                    // Load the Tor homepage.
+                    loadUrl(sharedPreferences.getString("tor_homepage", getString(R.string.tor_homepage_default_value)));
+                } else {
+                    // Load the normal homepage.
+                    loadUrl(sharedPreferences.getString("homepage", getString(R.string.homepage_default_value)));
+                }
+                break;
 
-                    // Update the back, forward, history, and requests menu items.
-                    navigationBackMenuItem.setEnabled(mainWebView.canGoBack());
-                    navigationForwardMenuItem.setEnabled(mainWebView.canGoForward());
-                    navigationHistoryMenuItem.setEnabled((mainWebView.canGoBack() || mainWebView.canGoForward()));
-                    navigationRequestsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
+            case R.id.back:
+                if (currentWebView.canGoBack()) {
+                    // Reset the current domain name so that navigation works if third-party requests are blocked.
+                    currentWebView.resetCurrentDomainName();
 
-                    // Hide the keyboard (if displayed).
-                    inputMethodManager.hideSoftInputFromWindow(mainWebView.getWindowToken(), 0);
+                    // Set navigating history so that the domain settings are applied when the new URL is loaded.
+                    currentWebView.setNavigatingHistory(true);
 
-                    // Clear the focus from from the URL text box and the WebView.  This removes any text selection markers and context menus, which otherwise draw above the open drawers.
-                    urlTextBox.clearFocus();
-                    mainWebView.clearFocus();
+                    // Load the previous website in the history.
+                    currentWebView.goBack();
                 }
-            }
-        });
-
-        // drawerToggle creates the hamburger icon at the start of the AppBar.
-        drawerToggle = new ActionBarDrawerToggle(this, drawerLayout, supportAppBar, R.string.open_navigation_drawer, R.string.close_navigation_drawer);
+                break;
 
-        // Get a handle for the progress bar.
-        final ProgressBar progressBar = findViewById(R.id.progress_bar);
+            case R.id.forward:
+                if (currentWebView.canGoForward()) {
+                    // Reset the current domain name so that navigation works if third-party requests are blocked.
+                    currentWebView.resetCurrentDomainName();
 
-        mainWebView.setWebChromeClient(new WebChromeClient() {
-            // Update the progress bar when a page is loading.
-            @Override
-            public void onProgressChanged(WebView view, int progress) {
-                // Inject the night mode CSS if night mode is enabled.
-                if (nightMode) {
-                    // `background-color: #212121` sets the background to be dark gray.  `color: #BDBDBD` sets the text color to be light gray.  `box-shadow: none` removes a lower underline on links
-                    // used by WordPress.  `text-decoration: none` removes all text underlines.  `text-shadow: none` removes text shadows, which usually have a hard coded color.
-                    // `border: none` removes all borders, which can also be used to underline text.  `a {color: #1565C0}` sets links to be a dark blue.
-                    // `::selection {background: #0D47A1}' sets the text selection highlight color to be a dark blue. `!important` takes precedent over any existing sub-settings.
-                    mainWebView.evaluateJavascript("(function() {var parent = document.getElementsByTagName('head').item(0); var style = document.createElement('style'); style.type = 'text/css'; " +
-                            "style.innerHTML = '* {background-color: #212121 !important; color: #BDBDBD !important; box-shadow: none !important; text-decoration: none !important;" +
-                            "text-shadow: none !important; border: none !important;} a {color: #1565C0 !important;} ::selection {background: #0D47A1 !important;}'; parent.appendChild(style)})()", value -> {
-                                // Initialize a handler to display `mainWebView`.
-                                Handler displayWebViewHandler = new Handler();
-
-                                // Setup a runnable to display `mainWebView` after a delay to allow the CSS to be applied.
-                                Runnable displayWebViewRunnable = () -> {
-                                    // Only display `mainWebView` if the progress bar is gone.  This prevents the display of the `WebView` while it is still loading.
-                                    if (progressBar.getVisibility() == View.GONE) {
-                                        mainWebView.setVisibility(View.VISIBLE);
-                                    }
-                                };
+                    // Set navigating history so that the domain settings are applied when the new URL is loaded.
+                    currentWebView.setNavigatingHistory(true);
 
-                                // Displaying of `mainWebView` after 500 milliseconds.
-                                displayWebViewHandler.postDelayed(displayWebViewRunnable, 500);
-                            });
+                    // Load the next website in the history.
+                    currentWebView.goForward();
                 }
+                break;
 
-                // Update the progress bar.
-                progressBar.setProgress(progress);
+            case R.id.history:
+                // Instantiate the URL history dialog.
+                DialogFragment urlHistoryDialogFragment = UrlHistoryDialog.loadBackForwardList(currentWebView.getWebViewFragmentId());
 
-                // Set the visibility of the progress bar.
-                if (progress < 100) {
-                    // Show the progress bar.
-                    progressBar.setVisibility(View.VISIBLE);
-                } else {
-                    // Hide the progress bar.
-                    progressBar.setVisibility(View.GONE);
+                // Show the URL history dialog.
+                urlHistoryDialogFragment.show(getSupportFragmentManager(), getString(R.string.history));
+                break;
 
-                    // Display `mainWebView` if night mode is disabled.
-                    // Because of a race condition between `applyDomainSettings` and `onPageStarted`, when night mode is set by domain settings the `WebView` may be hidden even if night mode is not
-                    // currently enabled.
-                    if (!nightMode) {
-                        mainWebView.setVisibility(View.VISIBLE);
-                    }
+            case R.id.requests:
+                // Populate the resource requests.
+                RequestsActivity.resourceRequests = currentWebView.getResourceRequests();
 
-                    //Stop the swipe to refresh indicator if it is running
-                    swipeRefreshLayout.setRefreshing(false);
-                }
-            }
+                // Create an intent to launch the Requests activity.
+                Intent requestsIntent = new Intent(this, RequestsActivity.class);
 
-            // Set the favorite icon when it changes.
-            @Override
-            public void onReceivedIcon(WebView view, Bitmap icon) {
-                // Only update the favorite icon if the website has finished loading.
-                if (progressBar.getVisibility() == View.GONE) {
-                    // Save a copy of the favorite icon.
-                    favoriteIconBitmap = icon;
+                // Add the block third-party requests status to the intent.
+                requestsIntent.putExtra("block_all_third_party_requests", currentWebView.isBlocklistEnabled(NestedScrollWebView.THIRD_PARTY_REQUESTS));
 
-                    // Place the favorite icon in the appBar.
-                    favoriteIconImageView.setImageBitmap(Bitmap.createScaledBitmap(icon, 64, 64, true));
-                }
-            }
+                // Make it so.
+                startActivity(requestsIntent);
+                break;
 
-            // Save a copy of the title when it changes.
-            @Override
-            public void onReceivedTitle(WebView view, String title) {
-                // Save a copy of the title.
-                webViewTitle = title;
-            }
+            case R.id.downloads:
+                // Launch the system Download Manager.
+                Intent downloadManagerIntent = new Intent(DownloadManager.ACTION_VIEW_DOWNLOADS);
 
-            // Enter full screen video.
-            @Override
-            public void onShowCustomView(View view, CustomViewCallback callback) {
-                // Set the full screen video flag.
-                displayingFullScreenVideo = true;
+                // Launch as a new task so that Download Manager and Privacy Browser show as separate windows in the recent tasks list.
+                downloadManagerIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
 
-                // Pause the ad if this is the free flavor.
-                if (BuildConfig.FLAVOR.contentEquals("free")) {
-                    // The AdView is destroyed and recreated, which changes the ID, every time it is reloaded to handle possible rotations.
-                    AdHelper.pauseAd(findViewById(R.id.adview));
-                }
+                startActivity(downloadManagerIntent);
+                break;
 
-                // Remove the translucent overlays.
-                getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
+            case R.id.domains:
+                // Set the flag to reapply the domain settings on restart when returning from Domain Settings.
+                reapplyDomainSettingsOnRestart = true;
 
-                // Remove the translucent status bar overlay on the `Drawer Layout`, which is special and needs its own command.
-                drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
+                // Launch the domains activity.
+                Intent domainsIntent = new Intent(this, DomainsActivity.class);
 
-                /* SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
-                 * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
-                 * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
-                 */
-                rootCoordinatorLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+                // Add the extra information to the intent.
+                domainsIntent.putExtra("current_url", currentWebView.getUrl());
+
+                // Get the current certificate.
+                SslCertificate sslCertificate = currentWebView.getCertificate();
+
+                // Check to see if the SSL certificate is populated.
+                if (sslCertificate != null) {
+                    // Extract the certificate to strings.
+                    String issuedToCName = sslCertificate.getIssuedTo().getCName();
+                    String issuedToOName = sslCertificate.getIssuedTo().getOName();
+                    String issuedToUName = sslCertificate.getIssuedTo().getUName();
+                    String issuedByCName = sslCertificate.getIssuedBy().getCName();
+                    String issuedByOName = sslCertificate.getIssuedBy().getOName();
+                    String issuedByUName = sslCertificate.getIssuedBy().getUName();
+                    long startDateLong = sslCertificate.getValidNotBeforeDate().getTime();
+                    long endDateLong = sslCertificate.getValidNotAfterDate().getTime();
+
+                    // Add the certificate to the intent.
+                    domainsIntent.putExtra("ssl_issued_to_cname", issuedToCName);
+                    domainsIntent.putExtra("ssl_issued_to_oname", issuedToOName);
+                    domainsIntent.putExtra("ssl_issued_to_uname", issuedToUName);
+                    domainsIntent.putExtra("ssl_issued_by_cname", issuedByCName);
+                    domainsIntent.putExtra("ssl_issued_by_oname", issuedByOName);
+                    domainsIntent.putExtra("ssl_issued_by_uname", issuedByUName);
+                    domainsIntent.putExtra("ssl_start_date", startDateLong);
+                    domainsIntent.putExtra("ssl_end_date", endDateLong);
+                }
 
-                // Set `rootCoordinatorLayout` to fill the entire screen.
-                rootCoordinatorLayout.setFitsSystemWindows(false);
+                // Check to see if the current IP addresses have been received.
+                if (currentWebView.hasCurrentIpAddresses()) {
+                    // Add the current IP addresses to the intent.
+                    domainsIntent.putExtra("current_ip_addresses", currentWebView.getCurrentIpAddresses());
+                }
 
-                // Disable the sliding drawers.
-                drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
+                // Make it so.
+                startActivity(domainsIntent);
+                break;
 
-                // Add `view` to `fullScreenVideoFrameLayout` and display it on the screen.
-                fullScreenVideoFrameLayout.addView(view);
-                fullScreenVideoFrameLayout.setVisibility(View.VISIBLE);
-            }
+            case R.id.settings:
+                // Set the flag to reapply app settings on restart when returning from Settings.
+                reapplyAppSettingsOnRestart = true;
 
-            // Exit full screen video.
-            @Override
-            public void onHideCustomView() {
-                // Unset the full screen video flag.
-                displayingFullScreenVideo = false;
+                // Set the flag to reapply the domain settings on restart when returning from Settings.
+                reapplyDomainSettingsOnRestart = true;
 
-                // Hide `fullScreenVideoFrameLayout`.
-                fullScreenVideoFrameLayout.removeAllViews();
-                fullScreenVideoFrameLayout.setVisibility(View.GONE);
+                // Launch the settings activity.
+                Intent settingsIntent = new Intent(this, SettingsActivity.class);
+                startActivity(settingsIntent);
+                break;
 
-                // Enable the sliding drawers.
-                drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
+            case R.id.import_export:
+                // Launch the import/export activity.
+                Intent importExportIntent = new Intent (this, ImportExportActivity.class);
+                startActivity(importExportIntent);
+                break;
 
-                // Apply the appropriate full screen mode the `SYSTEM_UI` flags.
-                if (fullScreenBrowsingModeEnabled && inFullScreenBrowsingMode) {  // Privacy Browser is currently in full screen browsing mode.
-                    if (hideSystemBarsOnFullscreen) {  // Hide everything.
-                        // Remove the translucent navigation setting if it is currently flagged.
-                        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
+            case R.id.logcat:
+                // Launch the logcat activity.
+                Intent logcatIntent = new Intent(this, LogcatActivity.class);
+                startActivity(logcatIntent);
+                break;
 
-                        // Remove the translucent status bar overlay.
-                        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
+            case R.id.guide:
+                // Launch `GuideActivity`.
+                Intent guideIntent = new Intent(this, GuideActivity.class);
+                startActivity(guideIntent);
+                break;
 
-                        // Remove the translucent status bar overlay on the `Drawer Layout`, which is special and needs its own command.
-                        drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
+            case R.id.about:
+                // Create an intent to launch the about activity.
+                Intent aboutIntent = new Intent(this, AboutActivity.class);
 
-                        /* SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
-                         * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
-                         * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
-                         */
-                        rootCoordinatorLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
-                    } else {  // Hide everything except the status and navigation bars.
-                        // Remove any `SYSTEM_UI` flags from `rootCoordinatorLayout`.
-                        rootCoordinatorLayout.setSystemUiVisibility(0);
+                // Create a string array for the blocklist versions.
+                String[] blocklistVersions = new String[] {easyList.get(0).get(0)[0], easyPrivacy.get(0).get(0)[0], fanboysAnnoyanceList.get(0).get(0)[0], fanboysSocialList.get(0).get(0)[0],
+                        ultraPrivacy.get(0).get(0)[0]};
 
-                        // Add the translucent status flag if it is unset.
-                        getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
+                // Add the blocklist versions to the intent.
+                aboutIntent.putExtra("blocklist_versions", blocklistVersions);
 
-                        if (translucentNavigationBarOnFullscreen) {
-                            // Set the navigation bar to be translucent.  This also resets `drawerLayout's` `View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN`.
-                            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
-                        } else {
-                            // Set the navigation bar to be black.
-                            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
-                        }
-                    }
-                } else {  // Switch to normal viewing mode.
-                    // Show the `appBar` if `findOnPageLinearLayout` is not visible.
-                    if (findOnPageLinearLayout.getVisibility() == View.GONE) {
-                        appBar.show();
-                    }
+                // Make it so.
+                startActivity(aboutIntent);
+                break;
+        }
 
-                    // Show the `BannerAd` in the free flavor.
-                    if (BuildConfig.FLAVOR.contentEquals("free")) {
-                        // Initialize the ad.  The AdView is destroyed and recreated, which changes the ID, every time it is reloaded to handle possible rotations.
-                        AdHelper.initializeAds(findViewById(R.id.adview), getApplicationContext(), getFragmentManager(), getString(R.string.google_app_id), getString(R.string.ad_unit_id));
-                    }
+        // Get a handle for the drawer layout.
+        DrawerLayout drawerLayout = findViewById(R.id.drawerlayout);
 
-                    // Remove any `SYSTEM_UI` flags from `rootCoordinatorLayout`.
-                    rootCoordinatorLayout.setSystemUiVisibility(0);
+        // Close the navigation drawer.
+        drawerLayout.closeDrawer(GravityCompat.START);
+        return true;
+    }
 
-                    // Remove the translucent navigation bar flag if it is set.
-                    getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
+    @Override
+    public void onPostCreate(Bundle savedInstanceState) {
+        // Run the default commands.
+        super.onPostCreate(savedInstanceState);
 
-                    // Add the translucent status flag if it is unset.  This also resets `drawerLayout's` `View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN`.
-                    getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
+        // Sync the state of the DrawerToggle after the default `onRestoreInstanceState()` has finished.  This creates the navigation drawer icon.
+        actionBarDrawerToggle.syncState();
+    }
 
-                    // Constrain `rootCoordinatorLayout` inside the status and navigation bars.
-                    rootCoordinatorLayout.setFitsSystemWindows(true);
-                }
+    @Override
+    public void onConfigurationChanged(Configuration newConfig) {
+        // Run the default commands.
+        super.onConfigurationChanged(newConfig);
 
-                // Show the ad if this is the free flavor.
-                if (BuildConfig.FLAVOR.contentEquals("free")) {
-                    // Reload the ad.  The AdView is destroyed and recreated, which changes the ID, every time it is reloaded to handle possible rotations.
-                    AdHelper.loadAd(findViewById(R.id.adview), getApplicationContext(), getString(R.string.ad_unit_id));
-                }
-            }
+        // Get the status bar pixel size.
+        int statusBarResourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
+        int statusBarPixelSize = getResources().getDimensionPixelSize(statusBarResourceId);
 
-            // Upload files.
-            @Override
-            public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {
-                // Show the file chooser if the device is running API >= 21.
-                if (Build.VERSION.SDK_INT >= 21) {
-                    // Store the file path callback.
-                    fileChooserCallback = filePathCallback;
+        // Get the resource density.
+        float screenDensity = getResources().getDisplayMetrics().density;
 
-                    // Create an intent to open a chooser based ont the file chooser parameters.
-                    Intent fileChooserIntent = fileChooserParams.createIntent();
+        // Recalculate the drawer header padding.
+        drawerHeaderPaddingLeftAndRight = (int) (15 * screenDensity);
+        drawerHeaderPaddingTop = statusBarPixelSize + (int) (4 * screenDensity);
+        drawerHeaderPaddingBottom = (int) (8 * screenDensity);
 
-                    // Open the file chooser.  Currently only one `startActivityForResult` exists in this activity, so the request code, used to differentiate them, is simply `0`.
-                    startActivityForResult(fileChooserIntent, 0);
-                }
-                return true;
-            }
-        });
+        // Reload the ad for the free flavor if not in full screen mode.
+        if (BuildConfig.FLAVOR.contentEquals("free") && !inFullScreenBrowsingMode) {
+            // Reload the ad.  The AdView is destroyed and recreated, which changes the ID, every time it is reloaded to handle possible rotations.
+            AdHelper.loadAd(findViewById(R.id.adview), getApplicationContext(), getString(R.string.ad_unit_id));
+        }
 
-        // Register `mainWebView` for a context menu.  This is used to see link targets and download images.
-        registerForContextMenu(mainWebView);
+        // `invalidateOptionsMenu` should recalculate the number of action buttons from the menu to display on the app bar, but it doesn't because of the this bug:
+        // https://code.google.com/p/android/issues/detail?id=20493#c8
+        // ActivityCompat.invalidateOptionsMenu(this);
+    }
 
-        // Allow the downloading of files.
-        mainWebView.setDownloadListener((String url, String userAgent, String contentDisposition, String mimetype, long contentLength) -> {
-            // Check if the download should be processed by an external app.
-            if (downloadWithExternalApp) {  // Download with an external app.
-                openUrlWithExternalApp(url);
-            } else {  // Download with Android's download manager.
-                // Check to see if the WRITE_EXTERNAL_STORAGE permission has already been granted.
-                if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_DENIED) {  // The storage permission has not been granted.
-                    // The WRITE_EXTERNAL_STORAGE permission needs to be requested.
+    @Override
+    public void onCreateContextMenu(ContextMenu menu, View view, ContextMenu.ContextMenuInfo menuInfo) {
+        // Store the hit test result.
+        final WebView.HitTestResult hitTestResult = currentWebView.getHitTestResult();
 
-                    // Store the variables for future use by `onRequestPermissionsResult()`.
-                    downloadUrl = url;
-                    downloadContentDisposition = contentDisposition;
-                    downloadContentLength = contentLength;
+        // Create the URL strings.
+        final String imageUrl;
+        final String linkUrl;
 
-                    // Show a dialog if the user has previously denied the permission.
-                    if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {  // Show a dialog explaining the request first.
-                        // Instantiate the download location permission alert dialog and set the download type to DOWNLOAD_FILE.
-                        DialogFragment downloadLocationPermissionDialogFragment = DownloadLocationPermissionDialog.downloadType(DownloadLocationPermissionDialog.DOWNLOAD_FILE);
+        // Get handles for the system managers.
+        final ClipboardManager clipboardManager = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
+        FragmentManager fragmentManager = getSupportFragmentManager();
+        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
 
-                        // Show the download location permission alert dialog.  The permission will be requested when the the dialog is closed.
-                        downloadLocationPermissionDialogFragment.show(getFragmentManager(), getString(R.string.download_location));
-                    } else {  // Show the permission request directly.
-                        // Request the permission.  The download dialog will be launched by `onRequestPermissionResult()`.
-                        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, DOWNLOAD_FILE_REQUEST_CODE);
-                    }
-                } else {  // The storage permission has already been granted.
-                    // Get a handle for the download file alert dialog.
-                    AppCompatDialogFragment downloadFileDialogFragment = DownloadFileDialog.fromUrl(url, contentDisposition, contentLength);
+        // Remove the lint errors below that the clipboard manager might be null.
+        assert clipboardManager != null;
 
-                    // Show the download file alert dialog.
-                    downloadFileDialogFragment.show(getSupportFragmentManager(), getString(R.string.download));
-                }
-            }
-        });
+        // Process the link according to the type.
+        switch (hitTestResult.getType()) {
+            // `SRC_ANCHOR_TYPE` is a link.
+            case WebView.HitTestResult.SRC_ANCHOR_TYPE:
+                // Get the target URL.
+                linkUrl = hitTestResult.getExtra();
 
-        // Allow pinch to zoom.
-        mainWebView.getSettings().setBuiltInZoomControls(true);
+                // Set the target URL as the title of the `ContextMenu`.
+                menu.setHeaderTitle(linkUrl);
 
-        // Hide zoom controls.
-        mainWebView.getSettings().setDisplayZoomControls(false);
+                // Add an Open in New Tab entry.
+                menu.add(R.string.open_in_new_tab).setOnMenuItemClickListener((MenuItem item) -> {
+                    // Load the link URL in a new tab.
+                    addNewTab(linkUrl);
+                    return false;
+                });
 
-        // Don't allow mixed content (HTTP and HTTPS) on the same website.
-        if (Build.VERSION.SDK_INT >= 21) {
-            mainWebView.getSettings().setMixedContentMode(WebSettings.MIXED_CONTENT_NEVER_ALLOW);
-        }
+                // Add an Open with App entry.
+                menu.add(R.string.open_with_app).setOnMenuItemClickListener((MenuItem item) -> {
+                    openWithApp(linkUrl);
+                    return false;
+                });
 
-        // Set the WebView to use a wide viewport.  Otherwise, some web pages will be scrunched and some content will render outside the screen.
-        mainWebView.getSettings().setUseWideViewPort(true);
+                // Add an Open with Browser entry.
+                menu.add(R.string.open_with_browser).setOnMenuItemClickListener((MenuItem item) -> {
+                    openWithBrowser(linkUrl);
+                    return false;
+                });
 
-        // Set the WebView to load in overview mode (zoomed out to the maximum width).
-        mainWebView.getSettings().setLoadWithOverviewMode(true);
+                // Add a Copy URL entry.
+                menu.add(R.string.copy_url).setOnMenuItemClickListener((MenuItem item) -> {
+                    // Save the link URL in a `ClipData`.
+                    ClipData srcAnchorTypeClipData = ClipData.newPlainText(getString(R.string.url), linkUrl);
 
-        // Explicitly disable geolocation.
-        mainWebView.getSettings().setGeolocationEnabled(false);
+                    // Set the `ClipData` as the clipboard's primary clip.
+                    clipboardManager.setPrimaryClip(srcAnchorTypeClipData);
+                    return false;
+                });
 
-        // Initialize cookieManager.
-        cookieManager = CookieManager.getInstance();
+                // Add a Download URL entry.
+                menu.add(R.string.download_url).setOnMenuItemClickListener((MenuItem item) -> {
+                    // Check if the download should be processed by an external app.
+                    if (sharedPreferences.getBoolean("download_with_external_app", false)) {  // Download with an external app.
+                        openUrlWithExternalApp(linkUrl);
+                    } else {  // Download with Android's download manager.
+                        // Check to see if the storage permission has already been granted.
+                        if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_DENIED) {  // The storage permission needs to be requested.
+                            // Store the variables for future use by `onRequestPermissionsResult()`.
+                            downloadUrl = linkUrl;
+                            downloadContentDisposition = "none";
+                            downloadContentLength = -1;
 
-        // Replace the header that `WebView` creates for `X-Requested-With` with a null value.  The default value is the application ID (com.stoutner.privacybrowser.standard).
-        customHeaders.put("X-Requested-With", "");
+                            // Show a dialog if the user has previously denied the permission.
+                            if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {  // Show a dialog explaining the request first.
+                                // Instantiate the download location permission alert dialog and set the download type to DOWNLOAD_FILE.
+                                DialogFragment downloadLocationPermissionDialogFragment = DownloadLocationPermissionDialog.downloadType(DownloadLocationPermissionDialog.DOWNLOAD_FILE);
 
-        // Initialize the default preference values the first time the program is run.  `false` keeps this command from resetting any current preferences back to default.
-        PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
+                                // Show the download location permission alert dialog.  The permission will be requested when the the dialog is closed.
+                                downloadLocationPermissionDialogFragment.show(fragmentManager, getString(R.string.download_location));
+                            } else {  // Show the permission request directly.
+                                // Request the permission.  The download dialog will be launched by `onRequestPermissionResult()`.
+                                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, DOWNLOAD_FILE_REQUEST_CODE);
+                            }
+                        } else {  // The storage permission has already been granted.
+                            // Get a handle for the download file alert dialog.
+                            DialogFragment downloadFileDialogFragment = DownloadFileDialog.fromUrl(linkUrl, "none", -1);
 
-        // Get a handle for the `Runtime`.
-        privacyBrowserRuntime = Runtime.getRuntime();
+                            // Show the download file alert dialog.
+                            downloadFileDialogFragment.show(fragmentManager, getString(R.string.download));
+                        }
+                    }
+                    return false;
+                });
 
-        // Store the application's private data directory.
-        privateDataDirectoryString = getApplicationInfo().dataDir;
-        // `dataDir` will vary, but will be something like `/data/user/0/com.stoutner.privacybrowser.standard`, which links to `/data/data/com.stoutner.privacybrowser.standard`.
+                // Add a Cancel entry, which by default closes the context menu.
+                menu.add(R.string.cancel);
+                break;
 
-        // Initialize `inFullScreenBrowsingMode`, which is always false at this point because Privacy Browser never starts in full screen browsing mode.
-        inFullScreenBrowsingMode = false;
+            case WebView.HitTestResult.EMAIL_TYPE:
+                // Get the target URL.
+                linkUrl = hitTestResult.getExtra();
 
-        // Initialize the privacy settings variables.
-        javaScriptEnabled = false;
-        firstPartyCookiesEnabled = false;
-        thirdPartyCookiesEnabled = false;
-        domStorageEnabled = false;
-        saveFormDataEnabled = false;  // Form data can be removed once the minimum API >= 26.
-        nightMode = false;
+                // Set the target URL as the title of the `ContextMenu`.
+                menu.setHeaderTitle(linkUrl);
 
-        // Store the default user agent.
-        webViewDefaultUserAgent = mainWebView.getSettings().getUserAgentString();
+                // Add a Write Email entry.
+                menu.add(R.string.write_email).setOnMenuItemClickListener(item -> {
+                    // Use `ACTION_SENDTO` instead of `ACTION_SEND` so that only email programs are launched.
+                    Intent emailIntent = new Intent(Intent.ACTION_SENDTO);
 
-        // Initialize the WebView title.
-        webViewTitle = getString(R.string.no_title);
+                    // Parse the url and set it as the data for the `Intent`.
+                    emailIntent.setData(Uri.parse("mailto:" + linkUrl));
 
-        // Initialize the favorite icon bitmap.  `ContextCompat` must be used until API >= 21.
-        Drawable favoriteIconDrawable = ContextCompat.getDrawable(getApplicationContext(), R.drawable.world);
-        BitmapDrawable favoriteIconBitmapDrawable = (BitmapDrawable) favoriteIconDrawable;
-        assert favoriteIconBitmapDrawable != null;
-        favoriteIconDefaultBitmap = favoriteIconBitmapDrawable.getBitmap();
+                    // `FLAG_ACTIVITY_NEW_TASK` opens the email program in a new task instead as part of Privacy Browser.
+                    emailIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
 
-        // If the favorite icon is null, load the default.
-        if (favoriteIconBitmap == null) {
-            favoriteIconBitmap = favoriteIconDefaultBitmap;
-        }
+                    // Make it so.
+                    startActivity(emailIntent);
+                    return false;
+                });
 
-        // Initialize the user agent array adapter and string array.
-        userAgentNamesArray = ArrayAdapter.createFromResource(this, R.array.user_agent_names, R.layout.spinner_item);
-        userAgentDataArray = resources.getStringArray(R.array.user_agent_data);
+                // Add a Copy Email Address entry.
+                menu.add(R.string.copy_email_address).setOnMenuItemClickListener(item -> {
+                    // Save the email address in a `ClipData`.
+                    ClipData srcEmailTypeClipData = ClipData.newPlainText(getString(R.string.email_address), linkUrl);
 
-        // Apply the app settings from the shared preferences.
-        applyAppSettings();
+                    // Set the `ClipData` as the clipboard's primary clip.
+                    clipboardManager.setPrimaryClip(srcEmailTypeClipData);
+                    return false;
+                });
 
-        // Instantiate the block list helper.
-        BlockListHelper blockListHelper = new BlockListHelper();
+                // Add a `Cancel` entry, which by default closes the `ContextMenu`.
+                menu.add(R.string.cancel);
+                break;
 
-        // Initialize the list of resource requests.
-        resourceRequests = new ArrayList<>();
+            // `IMAGE_TYPE` is an image. `SRC_IMAGE_ANCHOR_TYPE` is an image that is also a link.  Privacy Browser processes them the same.
+            case WebView.HitTestResult.IMAGE_TYPE:
+            case WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE:
+                // Get the image URL.
+                imageUrl = hitTestResult.getExtra();
 
-        // Parse the block lists.
-        final ArrayList<List<String[]>> easyList = blockListHelper.parseBlockList(getAssets(), "blocklists/easylist.txt");
-        final ArrayList<List<String[]>> easyPrivacy = blockListHelper.parseBlockList(getAssets(), "blocklists/easyprivacy.txt");
-        final ArrayList<List<String[]>> fanboysAnnoyanceList = blockListHelper.parseBlockList(getAssets(), "blocklists/fanboy-annoyance.txt");
-        final ArrayList<List<String[]>> fanboysSocialList = blockListHelper.parseBlockList(getAssets(), "blocklists/fanboy-social.txt");
-        final ArrayList<List<String[]>> ultraPrivacy = blockListHelper.parseBlockList(getAssets(), "blocklists/ultraprivacy.txt");
+                // Set the image URL as the title of the context menu.
+                menu.setHeaderTitle(imageUrl);
 
-        // Store the list versions.
-        easyListVersion = easyList.get(0).get(0)[0];
-        easyPrivacyVersion = easyPrivacy.get(0).get(0)[0];
-        fanboysAnnoyanceVersion = fanboysAnnoyanceList.get(0).get(0)[0];
-        fanboysSocialVersion = fanboysSocialList.get(0).get(0)[0];
-        ultraPrivacyVersion = ultraPrivacy.get(0).get(0)[0];
+                // Add an Open in New Tab entry.
+                menu.add(R.string.open_in_new_tab).setOnMenuItemClickListener((MenuItem item) -> {
+                    // Load the image URL in a new tab.
+                    addNewTab(imageUrl);
+                    return false;
+                });
 
-        // Get a handle for the activity.  This is used to update the requests counter while the navigation menu is open.
-        Activity activity = this;
+                // Add a View Image entry.
+                menu.add(R.string.view_image).setOnMenuItemClickListener(item -> {
+                    loadUrl(imageUrl);
+                    return false;
+                });
 
-        mainWebView.setWebViewClient(new WebViewClient() {
-            // `shouldOverrideUrlLoading` makes this `WebView` the default handler for URLs inside the app, so that links are not kicked out to other apps.
-            // The deprecated `shouldOverrideUrlLoading` must be used until API >= 24.
-            @SuppressWarnings("deprecation")
-            @Override
-            public boolean shouldOverrideUrlLoading(WebView view, String url) {
-                if (url.startsWith("http")) {  // Load the URL in Privacy Browser.
-                    // Reset the formatted URL string so the page will load correctly if blocking of third-party requests is enabled.
-                    formattedUrlString = "";
+                // Add a `Download Image` entry.
+                menu.add(R.string.download_image).setOnMenuItemClickListener((MenuItem item) -> {
+                    // Check if the download should be processed by an external app.
+                    if (sharedPreferences.getBoolean("download_with_external_app", false)) {  // Download with an external app.
+                        openUrlWithExternalApp(imageUrl);
+                    } else {  // Download with Android's download manager.
+                        // Check to see if the storage permission has already been granted.
+                        if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_DENIED) {  // The storage permission needs to be requested.
+                            // Store the image URL for use by `onRequestPermissionResult()`.
+                            downloadImageUrl = imageUrl;
 
-                    // Apply the domain settings for the new URL.  `applyDomainSettings` doesn't do anything if the domain has not changed.
-                    boolean userAgentChanged = applyDomainSettings(url, true, false);
+                            // Show a dialog if the user has previously denied the permission.
+                            if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {  // Show a dialog explaining the request first.
+                                // Instantiate the download location permission alert dialog and set the download type to DOWNLOAD_IMAGE.
+                                DialogFragment downloadLocationPermissionDialogFragment = DownloadLocationPermissionDialog.downloadType(DownloadLocationPermissionDialog.DOWNLOAD_IMAGE);
 
-                    // Check if the user agent has changed.
-                    if (userAgentChanged) {
-                        // Manually load the URL.  The changing of the user agent will cause WebView to reload the previous URL.
-                        mainWebView.loadUrl(url, customHeaders);
+                                // Show the download location permission alert dialog.  The permission will be requested when the dialog is closed.
+                                downloadLocationPermissionDialogFragment.show(fragmentManager, getString(R.string.download_location));
+                            } else {  // Show the permission request directly.
+                                // Request the permission.  The download dialog will be launched by `onRequestPermissionResult().
+                                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, DOWNLOAD_IMAGE_REQUEST_CODE);
+                            }
+                        } else {  // The storage permission has already been granted.
+                            // Get a handle for the download image alert dialog.
+                            DialogFragment downloadImageDialogFragment = DownloadImageDialog.imageUrl(imageUrl);
 
-                        // Returning true indicates that Privacy Browser is manually handling the loading of the URL.
-                        return true;
-                    } else {
-                        // Returning false causes the current WebView to handle the URL and prevents it from adding redirects to the history list.
-                        return false;
+                            // Show the download image alert dialog.
+                            downloadImageDialogFragment.show(fragmentManager, getString(R.string.download));
+                        }
                     }
-                } else if (url.startsWith("mailto:")) {  // Load the email address in an external email program.
-                    // Use `ACTION_SENDTO` instead of `ACTION_SEND` so that only email programs are launched.
-                    Intent emailIntent = new Intent(Intent.ACTION_SENDTO);
+                    return false;
+                });
 
-                    // Parse the url and set it as the data for the intent.
-                    emailIntent.setData(Uri.parse(url));
+                // Add a `Copy URL` entry.
+                menu.add(R.string.copy_url).setOnMenuItemClickListener(item -> {
+                    // Save the image URL in a `ClipData`.
+                    ClipData srcImageAnchorTypeClipData = ClipData.newPlainText(getString(R.string.url), imageUrl);
 
-                    // Open the email program in a new task instead of as part of Privacy Browser.
-                    emailIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+                    // Set the `ClipData` as the clipboard's primary clip.
+                    clipboardManager.setPrimaryClip(srcImageAnchorTypeClipData);
+                    return false;
+                });
 
-                    // Make it so.
-                    startActivity(emailIntent);
+                // Add an Open with App entry.
+                menu.add(R.string.open_with_app).setOnMenuItemClickListener((MenuItem item) -> {
+                    openWithApp(imageUrl);
+                    return false;
+                });
 
-                    // Returning true indicates Privacy Browser is handling the URL by creating an intent.
-                    return true;
-                } else if (url.startsWith("tel:")) {  // Load the phone number in the dialer.
-                    // Open the dialer and load the phone number, but wait for the user to place the call.
-                    Intent dialIntent = new Intent(Intent.ACTION_DIAL);
+                // Add an Open with Browser entry.
+                menu.add(R.string.open_with_browser).setOnMenuItemClickListener((MenuItem item) -> {
+                    openWithBrowser(imageUrl);
+                    return false;
+                });
 
-                    // Add the phone number to the intent.
-                    dialIntent.setData(Uri.parse(url));
+                // Add a `Cancel` entry, which by default closes the `ContextMenu`.
+                menu.add(R.string.cancel);
+                break;
+        }
+    }
 
-                    // Open the dialer in a new task instead of as part of Privacy Browser.
-                    dialIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+    @Override
+    public void onCreateBookmark(DialogFragment dialogFragment, Bitmap favoriteIconBitmap) {
+        // Get a handle for the bookmarks list view.
+        ListView bookmarksListView = findViewById(R.id.bookmarks_drawer_listview);
 
-                    // Make it so.
-                    startActivity(dialIntent);
+        // Get the views from the dialog fragment.
+        EditText createBookmarkNameEditText = dialogFragment.getDialog().findViewById(R.id.create_bookmark_name_edittext);
+        EditText createBookmarkUrlEditText = dialogFragment.getDialog().findViewById(R.id.create_bookmark_url_edittext);
 
-                    // Returning true indicates Privacy Browser is handling the URL by creating an intent.
-                    return true;
-                } else {  // Load a system chooser to select an app that can handle the URL.
-                    // Open an app that can handle the URL.
-                    Intent genericIntent = new Intent(Intent.ACTION_VIEW);
+        // Extract the strings from the edit texts.
+        String bookmarkNameString = createBookmarkNameEditText.getText().toString();
+        String bookmarkUrlString = createBookmarkUrlEditText.getText().toString();
 
-                    // Add the URL to the intent.
-                    genericIntent.setData(Uri.parse(url));
+        // Create a favorite icon byte array output stream.
+        ByteArrayOutputStream favoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
 
-                    // List all apps that can handle the URL instead of just opening the first one.
-                    genericIntent.addCategory(Intent.CATEGORY_BROWSABLE);
+        // Convert the favorite icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
+        favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, favoriteIconByteArrayOutputStream);
 
-                    // Open the app in a new task instead of as part of Privacy Browser.
-                    genericIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        // Convert the favorite icon byte array stream to a byte array.
+        byte[] favoriteIconByteArray = favoriteIconByteArrayOutputStream.toByteArray();
 
-                    // Start the app or display a snackbar if no app is available to handle the URL.
-                    try {
-                        startActivity(genericIntent);
-                    } catch (ActivityNotFoundException exception) {
-                        Snackbar.make(mainWebView, getString(R.string.unrecognized_url) + "  " + url, Snackbar.LENGTH_SHORT).show();
-                    }
+        // Display the new bookmark below the current items in the (0 indexed) list.
+        int newBookmarkDisplayOrder = bookmarksListView.getCount();
 
-                    // Returning true indicates Privacy Browser is handling the URL by creating an intent.
-                    return true;
-                }
-            }
+        // Create the bookmark.
+        bookmarksDatabaseHelper.createBookmark(bookmarkNameString, bookmarkUrlString, currentBookmarksFolder, newBookmarkDisplayOrder, favoriteIconByteArray);
 
-            // Check requests against the block lists.  The deprecated `shouldInterceptRequest()` must be used until minimum API >= 21.
-            @SuppressWarnings("deprecation")
-            @Override
-            public WebResourceResponse shouldInterceptRequest(WebView view, String url){
-                // Create an empty web resource response to be used if the resource request is blocked.
-                WebResourceResponse emptyWebResourceResponse = new WebResourceResponse("text/plain", "utf8", new ByteArrayInputStream("".getBytes()));
+        // Update the bookmarks cursor with the current contents of this folder.
+        bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentBookmarksFolder);
 
-                // Reset the whitelist results tracker.
-                whiteListResultStringArray = null;
+        // Update the list view.
+        bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 
-                // Initialize the third party request tracker.
-                boolean isThirdPartyRequest = false;
+        // Scroll to the new bookmark.
+        bookmarksListView.setSelection(newBookmarkDisplayOrder);
+    }
 
-                // Initialize the current domain string.
-                String currentDomain = "";
+    @Override
+    public void onCreateBookmarkFolder(DialogFragment dialogFragment, Bitmap favoriteIconBitmap) {
+        // Get a handle for the bookmarks list view.
+        ListView bookmarksListView = findViewById(R.id.bookmarks_drawer_listview);
 
-                // Nobody is happy when comparing null strings.
-                if (!(formattedUrlString == null) && !(url == null)) {
-                    // Get the domain strings to URIs.
-                    Uri currentDomainUri = Uri.parse(formattedUrlString);
-                    Uri requestDomainUri = Uri.parse(url);
+        // Get handles for the views in the dialog fragment.
+        EditText createFolderNameEditText = dialogFragment.getDialog().findViewById(R.id.create_folder_name_edittext);
+        RadioButton defaultFolderIconRadioButton = dialogFragment.getDialog().findViewById(R.id.create_folder_default_icon_radiobutton);
+        ImageView folderIconImageView = dialogFragment.getDialog().findViewById(R.id.create_folder_default_icon);
+
+        // Get new folder name string.
+        String folderNameString = createFolderNameEditText.getText().toString();
+
+        // Create a folder icon bitmap.
+        Bitmap folderIconBitmap;
+
+        // Set the folder icon bitmap according to the dialog.
+        if (defaultFolderIconRadioButton.isChecked()) {  // Use the default folder icon.
+            // Get the default folder icon drawable.
+            Drawable folderIconDrawable = folderIconImageView.getDrawable();
 
-                    // Get the domain host names.
-                    String currentBaseDomain = currentDomainUri.getHost();
-                    String requestBaseDomain = requestDomainUri.getHost();
+            // Convert the folder icon drawable to a bitmap drawable.
+            BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
 
-                    // Update the current domain variable.
-                    currentDomain = currentBaseDomain;
+            // Convert the folder icon bitmap drawable to a bitmap.
+            folderIconBitmap = folderIconBitmapDrawable.getBitmap();
+        } else {  // Use the WebView favorite icon.
+            // Copy the favorite icon bitmap to the folder icon bitmap.
+            folderIconBitmap = favoriteIconBitmap;
+        }
 
-                    // Only compare the current base domain and the request base domain if neither is null.
-                    if (!(currentBaseDomain == null) && !(requestBaseDomain == null)) {
-                        // Determine the current base domain.
-                        while (currentBaseDomain.indexOf(".", currentBaseDomain.indexOf(".") + 1) > 0) {  // There is at least one subdomain.
-                            // Remove the first subdomain.
-                            currentBaseDomain = currentBaseDomain.substring(currentBaseDomain.indexOf(".") + 1);
-                        }
+        // Create a folder icon byte array output stream.
+        ByteArrayOutputStream folderIconByteArrayOutputStream = new ByteArrayOutputStream();
 
-                        // Determine the request base domain.
-                        while (requestBaseDomain.indexOf(".", requestBaseDomain.indexOf(".") + 1) > 0) {  // There is at least one subdomain.
-                            // Remove the first subdomain.
-                            requestBaseDomain = requestBaseDomain.substring(requestBaseDomain.indexOf(".") + 1);
-                        }
+        // Convert the folder icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
+        folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream);
 
-                        // Update the third party request tracker.
-                        isThirdPartyRequest = !currentBaseDomain.equals(requestBaseDomain);
-                    }
-                }
+        // Convert the folder icon byte array stream to a byte array.
+        byte[] folderIconByteArray = folderIconByteArrayOutputStream.toByteArray();
 
-                // Block third-party requests if enabled.
-                if (isThirdPartyRequest && blockAllThirdPartyRequests) {
-                    // Increment the blocked requests counters.
-                    blockedRequests++;
-                    thirdPartyBlockedRequests++;
-
-                    // Update the titles of the blocklist menu items.  This must be run from the UI thread.
-                    activity.runOnUiThread(() -> {
-                        navigationRequestsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
-                        blocklistsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
-                        blockAllThirdPartyRequestsMenuItem.setTitle(thirdPartyBlockedRequests + " - " + getString(R.string.block_all_third_party_requests));
-                    });
+        // Move all the bookmarks down one in the display order.
+        for (int i = 0; i < bookmarksListView.getCount(); i++) {
+            int databaseId = (int) bookmarksListView.getItemIdAtPosition(i);
+            bookmarksDatabaseHelper.updateDisplayOrder(databaseId, i + 1);
+        }
 
-                    // Add the request to the log.
-                    resourceRequests.add(new String[]{String.valueOf(REQUEST_THIRD_PARTY), url});
+        // Create the folder, which will be placed at the top of the `ListView`.
+        bookmarksDatabaseHelper.createFolder(folderNameString, currentBookmarksFolder, folderIconByteArray);
 
-                    // Return an empty web resource response.
-                    return emptyWebResourceResponse;
-                }
+        // Update the bookmarks cursor with the current contents of this folder.
+        bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentBookmarksFolder);
 
-                // Check UltraPrivacy if it is enabled.
-                if (ultraPrivacyEnabled) {
-                    if (blockListHelper.isBlocked(currentDomain, url, isThirdPartyRequest, ultraPrivacy)) {
-                        // Increment the blocked requests counters.
-                        blockedRequests++;
-                        ultraPrivacyBlockedRequests++;
+        // Update the `ListView`.
+        bookmarksCursorAdapter.changeCursor(bookmarksCursor);
 
-                        // Update the titles of the blocklist menu items.  This must be run from the UI thread.
-                        activity.runOnUiThread(() -> {
-                            navigationRequestsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
-                            blocklistsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
-                            ultraPrivacyMenuItem.setTitle(ultraPrivacyBlockedRequests + " - " + getString(R.string.ultraprivacy));
-                        });
+        // Scroll to the new folder.
+        bookmarksListView.setSelection(0);
+    }
 
-                        // The resource request was blocked.  Return an empty web resource response.
-                        return emptyWebResourceResponse;
-                    }
+    @Override
+    public void onSaveBookmark(DialogFragment dialogFragment, int selectedBookmarkDatabaseId, Bitmap favoriteIconBitmap) {
+        // Get handles for the views from `dialogFragment`.
+        EditText editBookmarkNameEditText = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_name_edittext);
+        EditText editBookmarkUrlEditText = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_url_edittext);
+        RadioButton currentBookmarkIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_bookmark_current_icon_radiobutton);
 
-                    // If the whitelist result is not null, the request has been allowed by UltraPrivacy.
-                    if (whiteListResultStringArray != null) {
-                        // Add a whitelist entry to the resource requests array.
-                        resourceRequests.add(whiteListResultStringArray);
+        // Store the bookmark strings.
+        String bookmarkNameString = editBookmarkNameEditText.getText().toString();
+        String bookmarkUrlString = editBookmarkUrlEditText.getText().toString();
 
-                        // The resource request has been allowed by UltraPrivacy.  `return null` loads the requested resource.
-                        return null;
-                    }
-                }
+        // Update the bookmark.
+        if (currentBookmarkIconRadioButton.isChecked()) {  // Update the bookmark without changing the favorite icon.
+            bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString);
+        } else {  // Update the bookmark using the `WebView` favorite icon.
+            // Create a favorite icon byte array output stream.
+            ByteArrayOutputStream newFavoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
 
-                // Check EasyList if it is enabled.
-                if (easyListEnabled) {
-                    if (blockListHelper.isBlocked(currentDomain, url, isThirdPartyRequest, easyList)) {
-                        // Increment the blocked requests counters.
-                        blockedRequests++;
-                        easyListBlockedRequests++;
+            // Convert the favorite icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
+            favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFavoriteIconByteArrayOutputStream);
 
-                        // Update the titles of the blocklist menu items.  This must be run from the UI thread.
-                        activity.runOnUiThread(() -> {
-                            navigationRequestsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
-                            blocklistsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
-                            easyListMenuItem.setTitle(easyListBlockedRequests + " - " + getString(R.string.easylist));
-                        });
+            // Convert the favorite icon byte array stream to a byte array.
+            byte[] newFavoriteIconByteArray = newFavoriteIconByteArrayOutputStream.toByteArray();
 
-                        // Reset the whitelist results tracker (because otherwise it will sometimes add results to the list due to a race condition).
-                        whiteListResultStringArray = null;
+            //  Update the bookmark and the favorite icon.
+            bookmarksDatabaseHelper.updateBookmark(selectedBookmarkDatabaseId, bookmarkNameString, bookmarkUrlString, newFavoriteIconByteArray);
+        }
 
-                        // The resource request was blocked.  Return an empty web resource response.
-                        return emptyWebResourceResponse;
-                    }
-                }
+        // Update the bookmarks cursor with the current contents of this folder.
+        bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentBookmarksFolder);
 
-                // Check EasyPrivacy if it is enabled.
-                if (easyPrivacyEnabled) {
-                    if (blockListHelper.isBlocked(currentDomain, url, isThirdPartyRequest, easyPrivacy)) {
-                        // Increment the blocked requests counters.
-                        blockedRequests++;
-                        easyPrivacyBlockedRequests++;
+        // Update the list view.
+        bookmarksCursorAdapter.changeCursor(bookmarksCursor);
+    }
 
-                        // Update the titles of the blocklist menu items.  This must be run from the UI thread.
-                        activity.runOnUiThread(() -> {
-                            navigationRequestsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
-                            blocklistsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
-                            easyPrivacyMenuItem.setTitle(easyPrivacyBlockedRequests + " - " + getString(R.string.easyprivacy));
-                        });
+    @Override
+    public void onSaveBookmarkFolder(DialogFragment dialogFragment, int selectedFolderDatabaseId, Bitmap favoriteIconBitmap) {
+        // Get handles for the views from `dialogFragment`.
+        EditText editFolderNameEditText = dialogFragment.getDialog().findViewById(R.id.edit_folder_name_edittext);
+        RadioButton currentFolderIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_folder_current_icon_radiobutton);
+        RadioButton defaultFolderIconRadioButton = dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon_radiobutton);
+        ImageView defaultFolderIconImageView = dialogFragment.getDialog().findViewById(R.id.edit_folder_default_icon_imageview);
 
-                        // Reset the whitelist results tracker (because otherwise it will sometimes add results to the list due to a race condition).
-                        whiteListResultStringArray = null;
+        // Get the new folder name.
+        String newFolderNameString = editFolderNameEditText.getText().toString();
 
-                        // The resource request was blocked.  Return an empty web resource response.
-                        return emptyWebResourceResponse;
-                    }
-                }
+        // Check if the favorite icon has changed.
+        if (currentFolderIconRadioButton.isChecked()) {  // Only the name has changed.
+            // Update the name in the database.
+            bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, oldFolderNameString, newFolderNameString);
+        } else if (!currentFolderIconRadioButton.isChecked() && newFolderNameString.equals(oldFolderNameString)) {  // Only the icon has changed.
+            // Create the new folder icon Bitmap.
+            Bitmap folderIconBitmap;
 
-                // Check Fanboy’s Annoyance List if it is enabled.
-                if (fanboysAnnoyanceListEnabled) {
-                    if (blockListHelper.isBlocked(currentDomain, url, isThirdPartyRequest, fanboysAnnoyanceList)) {
-                        // Increment the blocked requests counters.
-                        blockedRequests++;
-                        fanboysAnnoyanceListBlockedRequests++;
+            // Populate the new folder icon bitmap.
+            if (defaultFolderIconRadioButton.isChecked()) {
+                // Get the default folder icon drawable.
+                Drawable folderIconDrawable = defaultFolderIconImageView.getDrawable();
 
-                        // Update the titles of the blocklist menu items.  This must be run from the UI thread.
-                        activity.runOnUiThread(() -> {
-                            navigationRequestsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
-                            blocklistsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
-                            fanboysAnnoyanceListMenuItem.setTitle(fanboysAnnoyanceListBlockedRequests + " - " + getString(R.string.fanboys_annoyance_list));
-                        });
+                // Convert the folder icon drawable to a bitmap drawable.
+                BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
 
-                        // Reset the whitelist results tracker (because otherwise it will sometimes add results to the list due to a race condition).
-                        whiteListResultStringArray = null;
+                // Convert the folder icon bitmap drawable to a bitmap.
+                folderIconBitmap = folderIconBitmapDrawable.getBitmap();
+            } else {  // Use the `WebView` favorite icon.
+                // Copy the favorite icon bitmap to the folder icon bitmap.
+                folderIconBitmap = favoriteIconBitmap;
+            }
 
-                        // The resource request was blocked.  Return an empty web resource response.
-                        return emptyWebResourceResponse;
-                    }
-                } else if (fanboysSocialBlockingListEnabled){  // Only check Fanboy’s Social Blocking List if Fanboy’s Annoyance List is disabled.
-                    if (blockListHelper.isBlocked(currentDomain, url, isThirdPartyRequest, fanboysSocialList)) {
-                        // Increment the blocked requests counters.
-                        blockedRequests++;
-                        fanboysSocialBlockingListBlockedRequests++;
+            // Create a folder icon byte array output stream.
+            ByteArrayOutputStream newFolderIconByteArrayOutputStream = new ByteArrayOutputStream();
 
-                        // Update the titles of the blocklist menu items.  This must be run from the UI thread.
-                        activity.runOnUiThread(() -> {
-                            navigationRequestsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
-                            blocklistsMenuItem.setTitle(getString(R.string.requests) + " - " + blockedRequests);
-                            fanboysSocialBlockingListMenuItem.setTitle(fanboysSocialBlockingListBlockedRequests + " - " + getString(R.string.fanboys_social_blocking_list));
-                        });
+            // Convert the folder icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
+            folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFolderIconByteArrayOutputStream);
 
-                        // Reset the whitelist results tracker (because otherwise it will sometimes add results to the list due to a race condition).
-                        whiteListResultStringArray = null;
+            // Convert the folder icon byte array stream to a byte array.
+            byte[] newFolderIconByteArray = newFolderIconByteArrayOutputStream.toByteArray();
 
-                        // The resource request was blocked.  Return an empty web resource response.
-                        return emptyWebResourceResponse;
-                    }
-                }
+            // Update the folder icon in the database.
+            bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, newFolderIconByteArray);
+        } else {  // The folder icon and the name have changed.
+            // Get the new folder icon `Bitmap`.
+            Bitmap folderIconBitmap;
+            if (defaultFolderIconRadioButton.isChecked()) {
+                // Get the default folder icon drawable.
+                Drawable folderIconDrawable = defaultFolderIconImageView.getDrawable();
 
-                // Add the request to the log because it hasn't been processed by any of the previous checks.
-                if (whiteListResultStringArray != null ) {  // The request was processed by a whitelist.
-                    resourceRequests.add(whiteListResultStringArray);
-                } else {  // The request didn't match any blocklist entry.  Log it as a default request.
-                    resourceRequests.add(new String[]{String.valueOf(REQUEST_DEFAULT), url});
-                }
+                // Convert the folder icon drawable to a bitmap drawable.
+                BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
 
-                // The resource request has not been blocked.  `return null` loads the requested resource.
-                return null;
+                // Convert the folder icon bitmap drawable to a bitmap.
+                folderIconBitmap = folderIconBitmapDrawable.getBitmap();
+            } else {  // Use the `WebView` favorite icon.
+                // Copy the favorite icon bitmap to the folder icon bitmap.
+                folderIconBitmap = favoriteIconBitmap;
             }
 
-            // Handle HTTP authentication requests.
-            @Override
-            public void onReceivedHttpAuthRequest(WebView view, HttpAuthHandler handler, String host, String realm) {
-                // Store `handler` so it can be accessed from `onHttpAuthenticationCancel()` and `onHttpAuthenticationProceed()`.
-                httpAuthHandler = handler;
-
-                // Display the HTTP authentication dialog.
-                AppCompatDialogFragment httpAuthenticationDialogFragment = HttpAuthenticationDialog.displayDialog(host, realm);
-                httpAuthenticationDialogFragment.show(getSupportFragmentManager(), getString(R.string.http_authentication));
-            }
+            // Create a folder icon byte array output stream.
+            ByteArrayOutputStream newFolderIconByteArrayOutputStream = new ByteArrayOutputStream();
 
-            // Update the URL in urlTextBox when the page starts to load.
-            @Override
-            public void onPageStarted(WebView view, String url, Bitmap favicon) {
-                // Reset the list of host IP addresses.
-                currentHostIpAddresses = "";
+            // Convert the folder icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
+            folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFolderIconByteArrayOutputStream);
 
-                // Reset the list of resource requests.
-                resourceRequests.clear();
+            // Convert the folder icon byte array stream to a byte array.
+            byte[] newFolderIconByteArray = newFolderIconByteArrayOutputStream.toByteArray();
 
-                // Initialize the counters for requests blocked by each blocklist.
-                blockedRequests = 0;
-                easyListBlockedRequests = 0;
-                easyPrivacyBlockedRequests = 0;
-                fanboysAnnoyanceListBlockedRequests = 0;
-                fanboysSocialBlockingListBlockedRequests = 0;
-                ultraPrivacyBlockedRequests = 0;
-                thirdPartyBlockedRequests = 0;
+            // Update the folder name and icon in the database.
+            bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, oldFolderNameString, newFolderNameString, newFolderIconByteArray);
+        }
 
-                // If night mode is enabled, hide `mainWebView` until after the night mode CSS is applied.
-                if (nightMode) {
-                    mainWebView.setVisibility(View.INVISIBLE);
-                }
+        // Update the bookmarks cursor with the current contents of this folder.
+        bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentBookmarksFolder);
 
-                // Hide the keyboard.  `0` indicates no additional flags.
-                inputMethodManager.hideSoftInputFromWindow(mainWebView.getWindowToken(), 0);
+        // Update the `ListView`.
+        bookmarksCursorAdapter.changeCursor(bookmarksCursor);
+    }
 
-                // Check to see if Privacy Browser is waiting on Orbot.
-                if (!waitingForOrbot) {  // We are not waiting on Orbot, so we need to process the URL.
-                    // The formatted URL string must be updated at the beginning of the load, so that if the user toggles JavaScript during the load the new website is reloaded.
-                    formattedUrlString = url;
+    @Override
+    public void onCloseDownloadLocationPermissionDialog(int downloadType) {
+        switch (downloadType) {
+            case DownloadLocationPermissionDialog.DOWNLOAD_FILE:
+                // Request the WRITE_EXTERNAL_STORAGE permission with a file request code.
+                ActivityCompat.requestPermissions(this, new String[] {Manifest.permission.WRITE_EXTERNAL_STORAGE}, DOWNLOAD_FILE_REQUEST_CODE);
+                break;
 
-                    // Display the formatted URL text.
-                    urlTextBox.setText(formattedUrlString);
+            case DownloadLocationPermissionDialog.DOWNLOAD_IMAGE:
+                // Request the WRITE_EXTERNAL_STORAGE permission with an image request code.
+                ActivityCompat.requestPermissions(this, new String[] {Manifest.permission.WRITE_EXTERNAL_STORAGE}, DOWNLOAD_IMAGE_REQUEST_CODE);
+                break;
+        }
+    }
 
-                    // Apply text highlighting to `urlTextBox`.
-                    highlightUrlText();
+    @Override
+    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
+        // Get a handle for the fragment manager.
+        FragmentManager fragmentManager = getSupportFragmentManager();
 
-                    // Get a URI for the current URL.
-                    Uri currentUri = Uri.parse(formattedUrlString);
+        switch (requestCode) {
+            case DOWNLOAD_FILE_REQUEST_CODE:
+                // Show the download file alert dialog.  When the dialog closes, the correct command will be used based on the permission status.
+                DialogFragment downloadFileDialogFragment = DownloadFileDialog.fromUrl(downloadUrl, downloadContentDisposition, downloadContentLength);
 
-                    // Get the IP addresses for the host.
-                    new GetHostIpAddresses(activity).execute(currentUri.getHost());
+                // On API 23, displaying the fragment must be delayed or the app will crash.
+                if (Build.VERSION.SDK_INT == 23) {
+                    new Handler().postDelayed(() -> downloadFileDialogFragment.show(fragmentManager, getString(R.string.download)), 500);
+                } else {
+                    downloadFileDialogFragment.show(fragmentManager, getString(R.string.download));
+                }
 
-                    // Apply any custom domain settings if the URL was loaded by navigating history.
-                    if (navigatingHistory) {
-                        // Apply the domain settings.
-                        boolean userAgentChanged = applyDomainSettings(url, true, false);
+                // Reset the download variables.
+                downloadUrl = "";
+                downloadContentDisposition = "";
+                downloadContentLength = 0;
+                break;
 
-                        // Reset `navigatingHistory`.
-                        navigatingHistory = false;
+            case DOWNLOAD_IMAGE_REQUEST_CODE:
+                // Show the download image alert dialog.  When the dialog closes, the correct command will be used based on the permission status.
+                DialogFragment downloadImageDialogFragment = DownloadImageDialog.imageUrl(downloadImageUrl);
 
-                        // Manually load the URL if the user agent has changed, which will have caused the previous URL to be reloaded.
-                        if (userAgentChanged) {
-                            loadUrl(formattedUrlString);
-                        }
-                    }
+                // On API 23, displaying the fragment must be delayed or the app will crash.
+                if (Build.VERSION.SDK_INT == 23) {
+                    new Handler().postDelayed(() -> downloadImageDialogFragment.show(fragmentManager, getString(R.string.download)), 500);
+                } else {
+                    downloadImageDialogFragment.show(fragmentManager, getString(R.string.download));
+                }
 
-                    // Set `urlIsLoading` to `true`, so that redirects while loading do not trigger changes in the user agent, which forces another reload of the existing page.
-                    urlIsLoading = true;
+                // Reset the image URL variable.
+                downloadImageUrl = "";
+                break;
+        }
+    }
 
-                    // Replace Refresh with Stop if the menu item has been created.  (The WebView typically begins loading before the menu items are instantiated.)
-                    if (refreshMenuItem != null) {
-                        // Set the title.
-                        refreshMenuItem.setTitle(R.string.stop);
+    @Override
+    public void onDownloadImage(DialogFragment dialogFragment, String imageUrl) {
+        // Download the image if it has an HTTP or HTTPS URI.
+        if (imageUrl.startsWith("http")) {
+            // Get a handle for the system `DOWNLOAD_SERVICE`.
+            DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
 
-                        // If the icon is displayed in the AppBar, set it according to the theme.
-                        if (displayAdditionalAppBarIcons) {
-                            if (darkTheme) {
-                                refreshMenuItem.setIcon(R.drawable.close_dark);
-                            } else {
-                                refreshMenuItem.setIcon(R.drawable.close_light);
-                            }
-                        }
-                    }
-                }
-            }
+            // Parse `imageUrl`.
+            DownloadManager.Request downloadRequest = new DownloadManager.Request(Uri.parse(imageUrl));
 
-            // It is necessary to update `formattedUrlString` and `urlTextBox` after the page finishes loading because the final URL can change during load.
-            @Override
-            public void onPageFinished(WebView view, String url) {
-                // Reset the wide view port if it has been turned off by the waiting for Orbot message.
-                if (!waitingForOrbot) {
-                    // Only use a wide view port if the URL starts with `http`, not for `file://` and `content://`.
-                    mainWebView.getSettings().setUseWideViewPort(url.startsWith("http"));
-                }
+            // Get a handle for the cookie manager.
+            CookieManager cookieManager = CookieManager.getInstance();
 
-                // Flush any cookies to persistent storage.  `CookieManager` has become very lazy about flushing cookies in recent versions.
-                if (firstPartyCookiesEnabled && Build.VERSION.SDK_INT >= 21) {
-                    cookieManager.flush();
-                }
+            // Pass cookies to download manager if cookies are enabled.  This is required to download images from websites that require a login.
+            // Code contributed 2017 Hendrik Knackstedt.  Copyright assigned to Soren Stoutner <soren@stoutner.com>.
+            if (cookieManager.acceptCookie()) {
+                // Get the cookies for `imageUrl`.
+                String cookies = cookieManager.getCookie(imageUrl);
 
-                // Update the Refresh menu item if it has been created.
-                if (refreshMenuItem != null) {
-                    // Reset the Refresh title.
-                    refreshMenuItem.setTitle(R.string.refresh);
+                // Add the cookies to `downloadRequest`.  In the HTTP request header, cookies are named `Cookie`.
+                downloadRequest.addRequestHeader("Cookie", cookies);
+            }
 
-                    // If the icon is displayed in the AppBar, reset it according to the theme.
-                    if (displayAdditionalAppBarIcons) {
-                        if (darkTheme) {
-                            refreshMenuItem.setIcon(R.drawable.refresh_enabled_dark);
-                        } else {
-                            refreshMenuItem.setIcon(R.drawable.refresh_enabled_light);
-                        }
-                    }
-                }
+            // Get the file name from the dialog fragment.
+            EditText downloadImageNameEditText = dialogFragment.getDialog().findViewById(R.id.download_image_name);
+            String imageName = downloadImageNameEditText.getText().toString();
 
-                // Reset `urlIsLoading`, which is used to prevent reloads on redirect if the user agent changes.
-                urlIsLoading = false;
+            // Specify the download location.
+            if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {  // External write permission granted.
+                // Download to the public download directory.
+                downloadRequest.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, imageName);
+            } else {  // External write permission denied.
+                // Download to the app's external download directory.
+                downloadRequest.setDestinationInExternalFilesDir(this, Environment.DIRECTORY_DOWNLOADS, imageName);
+            }
 
-                // Clear the cache and history if Incognito Mode is enabled.
-                if (incognitoModeEnabled) {
-                    // Clear the cache.  `true` includes disk files.
-                    mainWebView.clearCache(true);
+            // Allow `MediaScanner` to index the download if it is a media file.
+            downloadRequest.allowScanningByMediaScanner();
 
-                    // Clear the back/forward history.
-                    mainWebView.clearHistory();
+            // Add the URL as the description for the download.
+            downloadRequest.setDescription(imageUrl);
 
-                    // Manually delete cache folders.
-                    try {
-                        // Delete the main cache directory.
-                        privacyBrowserRuntime.exec("rm -rf " + privateDataDirectoryString + "/cache");
+            // Show the download notification after the download is completed.
+            downloadRequest.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
 
-                        // Delete the secondary `Service Worker` cache directory.
-                        // A `String[]` must be used because the directory contains a space and `Runtime.exec` will not escape the string correctly otherwise.
-                        privacyBrowserRuntime.exec(new String[] {"rm", "-rf", privateDataDirectoryString + "/app_webview/Service Worker/"});
-                    } catch (IOException e) {
-                        // Do nothing if an error is thrown.
-                    }
-                }
+            // Remove the lint warning below that `downloadManager` might be `null`.
+            assert downloadManager != null;
 
-                // Update the URL text box and apply domain settings if not waiting on Orbot.
-                if (!waitingForOrbot) {
-                    // Check to see if `WebView` has set `url` to be `about:blank`.
-                    if (url.equals("about:blank")) {  // `WebView` is blank, so `formattedUrlString` should be `""` and `urlTextBox` should display a hint.
-                        // Set `formattedUrlString` to `""`.
-                        formattedUrlString = "";
+            // Initiate the download.
+            downloadManager.enqueue(downloadRequest);
+        } else {  // The image is not an HTTP or HTTPS URI.
+            Snackbar.make(currentWebView, R.string.cannot_download_image, Snackbar.LENGTH_INDEFINITE).show();
+        }
+    }
 
-                        urlTextBox.setText(formattedUrlString);
+    @Override
+    public void onDownloadFile(DialogFragment dialogFragment, String downloadUrl) {
+        // Download the file if it has an HTTP or HTTPS URI.
+        if (downloadUrl.startsWith("http")) {
+            // Get a handle for the system `DOWNLOAD_SERVICE`.
+            DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
 
-                        // Request focus for `urlTextBox`.
-                        urlTextBox.requestFocus();
+            // Parse `downloadUrl`.
+            DownloadManager.Request downloadRequest = new DownloadManager.Request(Uri.parse(downloadUrl));
 
-                        // Display the keyboard.
-                        inputMethodManager.showSoftInput(urlTextBox, 0);
+            // Get a handle for the cookie manager.
+            CookieManager cookieManager = CookieManager.getInstance();
 
-                        // Apply the domain settings.  This clears any settings from the previous domain.
-                        applyDomainSettings(formattedUrlString, true, false);
-                    } else {  // `WebView` has loaded a webpage.
-                        // Set the formatted URL string.  Getting the URL from the WebView instead of using the one provided by `onPageFinished` makes websites like YouTube function correctly.
-                        formattedUrlString = mainWebView.getUrl();
+            // Pass cookies to download manager if cookies are enabled.  This is required to download files from websites that require a login.
+            // Code contributed 2017 Hendrik Knackstedt.  Copyright assigned to Soren Stoutner <soren@stoutner.com>.
+            if (cookieManager.acceptCookie()) {
+                // Get the cookies for `downloadUrl`.
+                String cookies = cookieManager.getCookie(downloadUrl);
 
-                        // Only update the URL text box if the user is not typing in it.
-                        if (!urlTextBox.hasFocus()) {
-                            // Display the formatted URL text.
-                            urlTextBox.setText(formattedUrlString);
+                // Add the cookies to `downloadRequest`.  In the HTTP request header, cookies are named `Cookie`.
+                downloadRequest.addRequestHeader("Cookie", cookies);
+            }
 
-                            // Apply text highlighting to `urlTextBox`.
-                            highlightUrlText();
-                        }
-                    }
+            // Get the file name from the dialog fragment.
+            EditText downloadFileNameEditText = dialogFragment.getDialog().findViewById(R.id.download_file_name);
+            String fileName = downloadFileNameEditText.getText().toString();
 
-                    // Store the SSL certificate so it can be accessed from `ViewSslCertificateDialog` and `PinnedMismatchDialog`.
-                    sslCertificate = mainWebView.getCertificate();
-
-                    // Check the current website information against any pinned domain information.
-                    if ((pinnedSslCertificate || pinnedIpAddresses) && !ignorePinnedDomainInformation) {
-                        // Initialize the current SSL certificate variables.
-                        String currentWebsiteIssuedToCName = "";
-                        String currentWebsiteIssuedToOName = "";
-                        String currentWebsiteIssuedToUName = "";
-                        String currentWebsiteIssuedByCName = "";
-                        String currentWebsiteIssuedByOName = "";
-                        String currentWebsiteIssuedByUName = "";
-                        Date currentWebsiteSslStartDate = null;
-                        Date currentWebsiteSslEndDate = null;
-
-
-                        // Extract the individual pieces of information from the current website SSL certificate if it is not null.
-                        if (sslCertificate != null) {
-                            currentWebsiteIssuedToCName = sslCertificate.getIssuedTo().getCName();
-                            currentWebsiteIssuedToOName = sslCertificate.getIssuedTo().getOName();
-                            currentWebsiteIssuedToUName = sslCertificate.getIssuedTo().getUName();
-                            currentWebsiteIssuedByCName = sslCertificate.getIssuedBy().getCName();
-                            currentWebsiteIssuedByOName = sslCertificate.getIssuedBy().getOName();
-                            currentWebsiteIssuedByUName = sslCertificate.getIssuedBy().getUName();
-                            currentWebsiteSslStartDate = sslCertificate.getValidNotBeforeDate();
-                            currentWebsiteSslEndDate = sslCertificate.getValidNotAfterDate();
-                        }
+            // Specify the download location.
+            if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {  // External write permission granted.
+                // Download to the public download directory.
+                downloadRequest.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName);
+            } else {  // External write permission denied.
+                // Download to the app's external download directory.
+                downloadRequest.setDestinationInExternalFilesDir(this, Environment.DIRECTORY_DOWNLOADS, fileName);
+            }
 
-                        // Initialize string variables to store the SSL certificate dates.  Strings are needed to compare the values below, which doesn't work with `Dates` if they are `null`.
-                        String currentWebsiteSslStartDateString = "";
-                        String currentWebsiteSslEndDateString = "";
-                        String pinnedSslStartDateString = "";
-                        String pinnedSslEndDateString = "";
+            // Allow `MediaScanner` to index the download if it is a media file.
+            downloadRequest.allowScanningByMediaScanner();
 
-                        // Convert the `Dates` to `Strings` if they are not `null`.
-                        if (currentWebsiteSslStartDate != null) {
-                            currentWebsiteSslStartDateString = currentWebsiteSslStartDate.toString();
-                        }
+            // Add the URL as the description for the download.
+            downloadRequest.setDescription(downloadUrl);
 
-                        if (currentWebsiteSslEndDate != null) {
-                            currentWebsiteSslEndDateString = currentWebsiteSslEndDate.toString();
-                        }
+            // Show the download notification after the download is completed.
+            downloadRequest.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
 
-                        if (pinnedSslStartDate != null) {
-                            pinnedSslStartDateString = pinnedSslStartDate.toString();
-                        }
+            // Remove the lint warning below that `downloadManager` might be `null`.
+            assert downloadManager != null;
 
-                        if (pinnedSslEndDate != null) {
-                            pinnedSslEndDateString = pinnedSslEndDate.toString();
-                        }
+            // Initiate the download.
+            downloadManager.enqueue(downloadRequest);
+        } else {  // The download is not an HTTP or HTTPS URI.
+            Snackbar.make(currentWebView, R.string.cannot_download_file, Snackbar.LENGTH_INDEFINITE).show();
+        }
+    }
 
-                        // Check to see if the pinned information matches the current information.
-                        if ((pinnedIpAddresses && !currentHostIpAddresses.equals(pinnedHostIpAddresses)) || (pinnedSslCertificate && (!currentWebsiteIssuedToCName.equals(pinnedSslIssuedToCName) ||
-                                !currentWebsiteIssuedToOName.equals(pinnedSslIssuedToOName) || !currentWebsiteIssuedToUName.equals(pinnedSslIssuedToUName) ||
-                                !currentWebsiteIssuedByCName.equals(pinnedSslIssuedByCName) || !currentWebsiteIssuedByOName.equals(pinnedSslIssuedByOName) ||
-                                !currentWebsiteIssuedByUName.equals(pinnedSslIssuedByUName) || !currentWebsiteSslStartDateString.equals(pinnedSslStartDateString) ||
-                                !currentWebsiteSslEndDateString.equals(pinnedSslEndDateString)))) {
+    // Override `onBackPressed` to handle the navigation drawer and and the WebView.
+    @Override
+    public void onBackPressed() {
+        // Get a handle for the drawer layout and the tab layout.
+        DrawerLayout drawerLayout = findViewById(R.id.drawerlayout);
+        TabLayout tabLayout = findViewById(R.id.tablayout);
 
-                            // Get a handle for the pinned mismatch alert dialog.
-                            AppCompatDialogFragment pinnedMismatchDialogFragment = PinnedMismatchDialog.displayDialog(pinnedSslCertificate, pinnedIpAddresses);
+        if (drawerLayout.isDrawerVisible(GravityCompat.START)) {  // The navigation drawer is open.
+            // Close the navigation drawer.
+            drawerLayout.closeDrawer(GravityCompat.START);
+        } else if (drawerLayout.isDrawerVisible(GravityCompat.END)){  // The bookmarks drawer is open.
+            if (currentBookmarksFolder.isEmpty()) {  // The home folder is displayed.
+                // close the bookmarks drawer.
+                drawerLayout.closeDrawer(GravityCompat.END);
+            } else {  // A subfolder is displayed.
+                // Place the former parent folder in `currentFolder`.
+                currentBookmarksFolder = bookmarksDatabaseHelper.getParentFolderName(currentBookmarksFolder);
 
-                            // Show the pinned mismatch alert dialog.
-                            pinnedMismatchDialogFragment.show(getSupportFragmentManager(), getString(R.string.pinned_mismatch));
-                        }
-                    }
-                }
+                // Load the new folder.
+                loadBookmarksFolder();
             }
+        } else if (currentWebView.canGoBack()) {  // There is at least one item in the current WebView history.
+            // Reset the current domain name so that navigation works if third-party requests are blocked.
+            currentWebView.resetCurrentDomainName();
 
-            // Handle SSL Certificate errors.
-            @Override
-            public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
-                // Get the current website SSL certificate.
-                SslCertificate currentWebsiteSslCertificate = error.getCertificate();
+            // Set navigating history so that the domain settings are applied when the new URL is loaded.
+            currentWebView.setNavigatingHistory(true);
 
-                // Extract the individual pieces of information from the current website SSL certificate.
-                String currentWebsiteIssuedToCName = currentWebsiteSslCertificate.getIssuedTo().getCName();
-                String currentWebsiteIssuedToOName = currentWebsiteSslCertificate.getIssuedTo().getOName();
-                String currentWebsiteIssuedToUName = currentWebsiteSslCertificate.getIssuedTo().getUName();
-                String currentWebsiteIssuedByCName = currentWebsiteSslCertificate.getIssuedBy().getCName();
-                String currentWebsiteIssuedByOName = currentWebsiteSslCertificate.getIssuedBy().getOName();
-                String currentWebsiteIssuedByUName = currentWebsiteSslCertificate.getIssuedBy().getUName();
-                Date currentWebsiteSslStartDate = currentWebsiteSslCertificate.getValidNotBeforeDate();
-                Date currentWebsiteSslEndDate = currentWebsiteSslCertificate.getValidNotAfterDate();
+            // Go back.
+            currentWebView.goBack();
+        } else if (tabLayout.getTabCount() > 1) {  // There are at least two tabs.
+            // Close the current tab.
+            closeCurrentTab();
+        } else {  // There isn't anything to do in Privacy Browser.
+            // Run the default commands.
+            super.onBackPressed();
 
-                // Proceed to the website if the current SSL website certificate matches the pinned domain certificate.
-                if (pinnedSslCertificate &&
-                        currentWebsiteIssuedToCName.equals(pinnedSslIssuedToCName) && currentWebsiteIssuedToOName.equals(pinnedSslIssuedToOName) &&
-                        currentWebsiteIssuedToUName.equals(pinnedSslIssuedToUName) && currentWebsiteIssuedByCName.equals(pinnedSslIssuedByCName) &&
-                        currentWebsiteIssuedByOName.equals(pinnedSslIssuedByOName) && currentWebsiteIssuedByUName.equals(pinnedSslIssuedByUName) &&
-                        currentWebsiteSslStartDate.equals(pinnedSslStartDate) && currentWebsiteSslEndDate.equals(pinnedSslEndDate)) {
-
-                    // An SSL certificate is pinned and matches the current domain certificate.  Proceed to the website without displaying an error.
-                    handler.proceed();
-                } else {  // Either there isn't a pinned SSL certificate or it doesn't match the current website certificate.
-                    // Store `handler` so it can be accesses from `onSslErrorCancel()` and `onSslErrorProceed()`.
-                    sslErrorHandler = handler;
+            // Manually kill Privacy Browser.  Otherwise, it is glitchy when restarted.
+            System.exit(0);
+        }
+    }
 
-                    // Display the SSL error `AlertDialog`.
-                    AppCompatDialogFragment sslCertificateErrorDialogFragment = SslCertificateErrorDialog.displayDialog(error);
-                    sslCertificateErrorDialogFragment.show(getSupportFragmentManager(), getString(R.string.ssl_certificate_error));
-                }
-            }
-        });
+    // Process the results of an upload file chooser.  Currently there is only one `startActivityForResult` in this activity, so the request code, used to differentiate them, is ignored.
+    @Override
+    public void onActivityResult(int requestCode, int resultCode, Intent data) {
+        // File uploads only work on API >= 21.
+        if (Build.VERSION.SDK_INT >= 21) {
+            // Pass the file to the WebView.
+            fileChooserCallback.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode, data));
+        }
+    }
 
-        // Get the intent that started the app.
-        Intent launchingIntent = getIntent();
+    private void loadUrlFromTextBox() {
+        // Get a handle for the URL edit text.
+        EditText urlEditText = findViewById(R.id.url_edittext);
 
-        // Get the information from the intent.
-        String launchingIntentAction = launchingIntent.getAction();
-        Uri launchingIntentUriData = launchingIntent.getData();
+        // Get the text from urlTextBox and convert it to a string.  trim() removes white spaces from the beginning and end of the string.
+        String unformattedUrlString = urlEditText.getText().toString().trim();
 
-        // If the intent action is a web search, perform the search.
-        if ((launchingIntentAction != null) && launchingIntentAction.equals(Intent.ACTION_WEB_SEARCH)) {
-            // Create an encoded URL string.
-            String encodedUrlString;
+        // Initialize the formatted URL string.
+        String url = "";
 
-            // Sanitize the search input and convert it to a search.
-            try {
-                encodedUrlString = URLEncoder.encode(launchingIntent.getStringExtra(SearchManager.QUERY), "UTF-8");
-            } catch (UnsupportedEncodingException exception) {
-                encodedUrlString = "";
+        // Check to see if `unformattedUrlString` is a valid URL.  Otherwise, convert it into a search.
+        if (unformattedUrlString.startsWith("content://")) {  // This is a Content URL.
+            // Load the entire content URL.
+            url = unformattedUrlString;
+        } else if (Patterns.WEB_URL.matcher(unformattedUrlString).matches() || unformattedUrlString.startsWith("http://") || unformattedUrlString.startsWith("https://") ||
+                unformattedUrlString.startsWith("file://")) {  // This is a standard URL.
+            // Add `https://` at the beginning if there is no protocol.  Otherwise the app will segfault.
+            if (!unformattedUrlString.startsWith("http") && !unformattedUrlString.startsWith("file://") && !unformattedUrlString.startsWith("content://")) {
+                unformattedUrlString = "https://" + unformattedUrlString;
             }
 
-            // Add the base search URL.
-            formattedUrlString = searchURL + encodedUrlString;
-        } else if (launchingIntentUriData != null){  // Check to see if the intent contains a new URL.
-            // Set the formatted URL string.
-            formattedUrlString = launchingIntentUriData.toString();
-        }
+            // Initialize `unformattedUrl`.
+            URL unformattedUrl = null;
 
-        // Load the website if not waiting for Orbot to connect.
-        if (!waitingForOrbot) {
-            loadUrl(formattedUrlString);
-        }
-    }
+            // Convert `unformattedUrlString` to a `URL`, then to a `URI`, and then back to a `String`, which sanitizes the input and adds in any missing components.
+            try {
+                unformattedUrl = new URL(unformattedUrlString);
+            } catch (MalformedURLException e) {
+                e.printStackTrace();
+            }
 
-    @Override
-    protected void onNewIntent(Intent intent) {
-        // Sets the new intent as the activity intent, so that any future `getIntent()`s pick up this one instead of creating a new activity.
-        setIntent(intent);
+            // The ternary operator (? :) makes sure that a null pointer exception is not thrown, which would happen if `.get` was called on a `null` value.
+            String scheme = unformattedUrl != null ? unformattedUrl.getProtocol() : null;
+            String authority = unformattedUrl != null ? unformattedUrl.getAuthority() : null;
+            String path = unformattedUrl != null ? unformattedUrl.getPath() : null;
+            String query = unformattedUrl != null ? unformattedUrl.getQuery() : null;
+            String fragment = unformattedUrl != null ? unformattedUrl.getRef() : null;
 
-        // Get the information from the intent.
-        String intentAction = intent.getAction();
-        Uri intentUriData = intent.getData();
+            // Build the URI.
+            Uri.Builder uri = new Uri.Builder();
+            uri.scheme(scheme).authority(authority).path(path).query(query).fragment(fragment);
 
-        // If the intent action is a web search, perform the search.
-        if ((intentAction != null) && intentAction.equals(Intent.ACTION_WEB_SEARCH)) {
-            // Create an encoded URL string.
+            // Decode the URI as a UTF-8 string in.
+            try {
+                url = URLDecoder.decode(uri.build().toString(), "UTF-8");
+            } catch (UnsupportedEncodingException exception) {
+                // Do nothing.  The formatted URL string will remain blank.
+            }
+        } else if (!unformattedUrlString.isEmpty()){  // This is not a URL, but rather a search string.
+            // Create an encoded URL String.
             String encodedUrlString;
 
-            // Sanitize the search input and convert it to a search.
+            // Sanitize the search input.
             try {
-                encodedUrlString = URLEncoder.encode(intent.getStringExtra(SearchManager.QUERY), "UTF-8");
+                encodedUrlString = URLEncoder.encode(unformattedUrlString, "UTF-8");
             } catch (UnsupportedEncodingException exception) {
                 encodedUrlString = "";
             }
 
             // Add the base search URL.
-            formattedUrlString = searchURL + encodedUrlString;
-        } else if (intentUriData != null){  // Check to see if the intent contains a new URL.
-            // Set the formatted URL string.
-            formattedUrlString = intentUriData.toString();
-        }
-
-        // Load the URL.
-        loadUrl(formattedUrlString);
-
-        // Close the navigation drawer if it is open.
-        if (drawerLayout.isDrawerVisible(GravityCompat.START)) {
-            drawerLayout.closeDrawer(GravityCompat.START);
+            url = searchURL + encodedUrlString;
         }
 
-        // Close the bookmarks drawer if it is open.
-        if (drawerLayout.isDrawerVisible(GravityCompat.END)) {
-            drawerLayout.closeDrawer(GravityCompat.END);
-        }
+        // Clear the focus from the URL edit text.  Otherwise, proximate typing in the box will retain the colorized formatting instead of being reset during refocus.
+        urlEditText.clearFocus();
 
-        // Clear the keyboard if displayed and remove the focus on the urlTextBar if it has it.
-        mainWebView.requestFocus();
+        // Make it so.
+        loadUrl(url);
     }
 
-    @Override
-    public void onRestart() {
-        // Run the default commands.
-        super.onRestart();
+    private void loadUrl(String url) {
+        // Sanitize the URL.
+        url = sanitizeUrl(url);
 
-        // Make sure Orbot is running if Privacy Browser is proxying through Orbot.
-        if (proxyThroughOrbot) {
-            // Request Orbot to start.  If Orbot is already running no hard will be caused by this request.
-            Intent orbotIntent = new Intent("org.torproject.android.intent.action.START");
+        // Apply the domain settings.
+        applyDomainSettings(currentWebView, url, true, false);
 
-            // Send the intent to the Orbot package.
-            orbotIntent.setPackage("org.torproject.android");
+        // Load the URL.
+        currentWebView.loadUrl(url, customHeaders);
+    }
 
-            // Make it so.
-            sendBroadcast(orbotIntent);
-        }
+    public void findPreviousOnPage(View view) {
+        // Go to the previous highlighted phrase on the page.  `false` goes backwards instead of forwards.
+        currentWebView.findNext(false);
+    }
 
-        // Apply the app settings if returning from the Settings activity..
-        if (reapplyAppSettingsOnRestart) {
-            // Apply the app settings.
-            applyAppSettings();
+    public void findNextOnPage(View view) {
+        // Go to the next highlighted phrase on the page. `true` goes forwards instead of backwards.
+        currentWebView.findNext(true);
+    }
 
-            // Reload the webpage if displaying of images has been disabled in the Settings activity.
-            if (reloadOnRestart) {
-                // Reload `mainWebView`.
-                mainWebView.reload();
+    public void closeFindOnPage(View view) {
+        // Get a handle for the views.
+        Toolbar toolbar = findViewById(R.id.toolbar);
+        LinearLayout findOnPageLinearLayout = findViewById(R.id.find_on_page_linearlayout);
+        EditText findOnPageEditText = findViewById(R.id.find_on_page_edittext);
 
-                // Reset `reloadOnRestartBoolean`.
-                reloadOnRestart = false;
-            }
+        // Delete the contents of `find_on_page_edittext`.
+        findOnPageEditText.setText(null);
 
-            // Reset the return from settings flag.
-            reapplyAppSettingsOnRestart = false;
+        // Clear the highlighted phrases if the WebView is not null.
+        if (currentWebView != null) {
+            currentWebView.clearMatches();
         }
 
-        // Apply the domain settings if returning from the Domains activity.
-        if (reapplyDomainSettingsOnRestart) {
-            // Reapply the domain settings.
-            applyDomainSettings(formattedUrlString, false, true);
-
-            // Reset `reapplyDomainSettingsOnRestart`.
-            reapplyDomainSettingsOnRestart = false;
-        }
+        // Hide the find on page linear layout.
+        findOnPageLinearLayout.setVisibility(View.GONE);
 
-        // Load the URL on restart to apply changes to night mode.
-        if (loadUrlOnRestart) {
-            // Load the current `formattedUrlString`.
-            loadUrl(formattedUrlString);
+        // Show the toolbar.
+        toolbar.setVisibility(View.VISIBLE);
 
-            // Reset `loadUrlOnRestart.
-            loadUrlOnRestart = false;
-        }
+        // Get a handle for the input method manager.
+        InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
 
-        // Update the bookmarks drawer if returning from the Bookmarks activity.
-        if (restartFromBookmarksActivity) {
-            // Close the bookmarks drawer.
-            drawerLayout.closeDrawer(GravityCompat.END);
+        // Remove the lint warning below that the input method manager might be null.
+        assert inputMethodManager != null;
 
-            // Reload the bookmarks drawer.
-            loadBookmarksFolder();
+        // Hide the keyboard.
+        inputMethodManager.hideSoftInputFromWindow(toolbar.getWindowToken(), 0);
+    }
 
-            // Reset `restartFromBookmarksActivity`.
-            restartFromBookmarksActivity = false;
+    private void applyAppSettings() {
+        // Initialize the app if this is the first run.  This is done here instead of in `onCreate()` to shorten the time that an unthemed background is displayed on app startup.
+        if (webViewDefaultUserAgent == null) {
+            initializeApp();
         }
 
-        // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.  This can be important if the screen was rotated.
-        updatePrivacyIcons(true);
-    }
-
-    // `onResume()` runs after `onStart()`, which runs after `onCreate()` and `onRestart()`.
-    @Override
-    public void onResume() {
-        // Run the default commands.
-        super.onResume();
+        // Get a handle for the shared preferences.
+        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
 
-        // Resume JavaScript (if enabled).
-        mainWebView.resumeTimers();
+        // Store the values from the shared preferences in variables.
+        incognitoModeEnabled = sharedPreferences.getBoolean("incognito_mode", false);
+        boolean doNotTrackEnabled = sharedPreferences.getBoolean("do_not_track", false);
+        sanitizeGoogleAnalytics = sharedPreferences.getBoolean("google_analytics", true);
+        sanitizeFacebookClickIds = sharedPreferences.getBoolean("facebook_click_ids", true);
+        sanitizeTwitterAmpRedirects = sharedPreferences.getBoolean("twitter_amp_redirects", true);
+        proxyThroughOrbot = sharedPreferences.getBoolean("proxy_through_orbot", false);
+        fullScreenBrowsingModeEnabled = sharedPreferences.getBoolean("full_screen_browsing_mode", false);
+        hideAppBar = sharedPreferences.getBoolean("hide_app_bar", true);
+        scrollAppBar = sharedPreferences.getBoolean("scroll_app_bar", true);
 
-        // Resume `mainWebView`.
-        mainWebView.onResume();
+        // Get handles for the views that need to be modified.
+        FrameLayout rootFrameLayout = findViewById(R.id.root_framelayout);
+        AppBarLayout appBarLayout = findViewById(R.id.appbar_layout);
+        ActionBar actionBar = getSupportActionBar();
+        Toolbar toolbar = findViewById(R.id.toolbar);
+        LinearLayout findOnPageLinearLayout = findViewById(R.id.find_on_page_linearlayout);
+        LinearLayout tabsLinearLayout = findViewById(R.id.tabs_linearlayout);
+        SwipeRefreshLayout swipeRefreshLayout = findViewById(R.id.swiperefreshlayout);
 
-        // Resume the adView for the free flavor.
-        if (BuildConfig.FLAVOR.contentEquals("free")) {
-            // Resume the ad.
-            AdHelper.resumeAd(findViewById(R.id.adview));
-        }
+        // Remove the incorrect lint warning below that the action bar might be null.
+        assert actionBar != null;
 
-        // Display a message to the user if waiting for Orbot.
-        if (waitingForOrbot && !orbotStatus.equals("ON")) {
-            // Disable the wide view port so that the waiting for Orbot text is displayed correctly.
-            mainWebView.getSettings().setUseWideViewPort(false);
+        // Apply the proxy through Orbot settings.
+        applyProxyThroughOrbot(false);
 
-            // Load a waiting page.  `null` specifies no encoding, which defaults to ASCII.
-            mainWebView.loadData(waitingForOrbotHtmlString, "text/html", null);
+        // Set Do Not Track status.
+        if (doNotTrackEnabled) {
+            customHeaders.put("DNT", "1");
+        } else {
+            customHeaders.remove("DNT");
         }
 
-        if (displayingFullScreenVideo) {
-            // Remove the translucent overlays.
-            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
-
-            // Remove the translucent status bar overlay on the `Drawer Layout`, which is special and needs its own command.
-            drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
-
-            /* SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
-             * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
-             * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
-             */
-            rootCoordinatorLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+        // Get the current layout parameters.  Using coordinator layout parameters allows the `setBehavior()` command and using app bar layout parameters allows the `setScrollFlags()` command.
+        CoordinatorLayout.LayoutParams swipeRefreshLayoutParams = (CoordinatorLayout.LayoutParams) swipeRefreshLayout.getLayoutParams();
+        AppBarLayout.LayoutParams toolbarLayoutParams = (AppBarLayout.LayoutParams) toolbar.getLayoutParams();
+        AppBarLayout.LayoutParams findOnPageLayoutParams = (AppBarLayout.LayoutParams) findOnPageLinearLayout.getLayoutParams();
+        AppBarLayout.LayoutParams tabsLayoutParams = (AppBarLayout.LayoutParams) tabsLinearLayout.getLayoutParams();
+
+        // Add the scrolling behavior to the layout parameters.
+        if (scrollAppBar) {
+            // Enable scrolling of the app bar.
+            swipeRefreshLayoutParams.setBehavior(new AppBarLayout.ScrollingViewBehavior());
+            toolbarLayoutParams.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL | AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS | AppBarLayout.LayoutParams.SCROLL_FLAG_SNAP);
+            findOnPageLayoutParams.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL | AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS | AppBarLayout.LayoutParams.SCROLL_FLAG_SNAP);
+            tabsLayoutParams.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL | AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS | AppBarLayout.LayoutParams.SCROLL_FLAG_SNAP);
+        } else {
+            // Disable scrolling of the app bar.
+            swipeRefreshLayoutParams.setBehavior(null);
+            toolbarLayoutParams.setScrollFlags(0);
+            findOnPageLayoutParams.setScrollFlags(0);
+            tabsLayoutParams.setScrollFlags(0);
+
+            // Expand the app bar if it is currently collapsed.
+            appBarLayout.setExpanded(true);
         }
-    }
 
-    @Override
-    public void onPause() {
-        // Run the default commands.
-        super.onPause();
+        // Apply the modified layout parameters.
+        swipeRefreshLayout.setLayoutParams(swipeRefreshLayoutParams);
+        toolbar.setLayoutParams(toolbarLayoutParams);
+        findOnPageLinearLayout.setLayoutParams(findOnPageLayoutParams);
+        tabsLinearLayout.setLayoutParams(tabsLayoutParams);
 
-        // Pause `mainWebView`.
-        mainWebView.onPause();
+        // Set the app bar scrolling for each WebView.
+        for (int i = 0; i < webViewPagerAdapter.getCount(); i++) {
+            // Get the WebView tab fragment.
+            WebViewTabFragment webViewTabFragment = webViewPagerAdapter.getPageFragment(i);
 
-        // Stop all JavaScript.
-        mainWebView.pauseTimers();
+            // Get the fragment view.
+            View fragmentView = webViewTabFragment.getView();
 
-        // Pause the ad or it will continue to consume resources in the background on the free flavor.
-        if (BuildConfig.FLAVOR.contentEquals("free")) {
-            // Pause the ad.
-            AdHelper.pauseAd(findViewById(R.id.adview));
+            // Only modify the WebViews if they exist.
+            if (fragmentView != null) {
+                // Get the nested scroll WebView from the tab fragment.
+                NestedScrollWebView nestedScrollWebView = fragmentView.findViewById(R.id.nestedscroll_webview);
+
+                // Set the app bar scrolling.
+                nestedScrollWebView.setNestedScrollingEnabled(scrollAppBar);
+            }
         }
-    }
 
-    @Override
-    public void onDestroy() {
-        // Unregister the Orbot status broadcast receiver.
-        this.unregisterReceiver(orbotStatusBroadcastReceiver);
+        // Update the full screen browsing mode settings.
+        if (fullScreenBrowsingModeEnabled && inFullScreenBrowsingMode) {  // Privacy Browser is currently in full screen browsing mode.
+            // Update the visibility of the app bar, which might have changed in the settings.
+            if (hideAppBar) {
+                // Hide the tab linear layout.
+                tabsLinearLayout.setVisibility(View.GONE);
 
-        // Close the bookmarks cursor and database.
-        bookmarksCursor.close();
-        bookmarksDatabaseHelper.close();
+                // Hide the action bar.
+                actionBar.hide();
+            } else {
+                // Show the tab linear layout.
+                tabsLinearLayout.setVisibility(View.VISIBLE);
 
-        // Run the default commands.
-        super.onDestroy();
-    }
+                // Show the action bar.
+                actionBar.show();
+            }
 
-    @Override
-    public boolean onCreateOptionsMenu(Menu menu) {
-        // Inflate the menu; this adds items to the action bar if it is present.
-        getMenuInflater().inflate(R.menu.webview_options_menu, menu);
+            // Hide the banner ad in the free flavor.
+            if (BuildConfig.FLAVOR.contentEquals("free")) {
+                AdHelper.hideAd(findViewById(R.id.adview));
+            }
 
-        // Set mainMenu so it can be used by `onOptionsItemSelected()` and `updatePrivacyIcons`.
-        mainMenu = menu;
+            // Remove the translucent status flag.  This is necessary so the root frame layout can fill the entire screen.
+            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
 
-        // Set the initial status of the privacy icons.  `false` does not call `invalidateOptionsMenu` as the last step.
-        updatePrivacyIcons(false);
+            /* Hide the system bars.
+             * SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
+             * SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN makes the root frame layout fill the area that is normally reserved for the status bar.
+             * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
+             * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
+             */
+            rootFrameLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
+                    View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+        } else {  // Privacy Browser is not in full screen browsing mode.
+            // Reset the full screen tracker, which could be true if Privacy Browser was in full screen mode before entering settings and full screen browsing was disabled.
+            inFullScreenBrowsingMode = false;
 
-        // Get handles for the menu items.
-        MenuItem toggleFirstPartyCookiesMenuItem = menu.findItem(R.id.toggle_first_party_cookies);
-        MenuItem toggleThirdPartyCookiesMenuItem = menu.findItem(R.id.toggle_third_party_cookies);
-        MenuItem toggleDomStorageMenuItem = menu.findItem(R.id.toggle_dom_storage);
-        MenuItem toggleSaveFormDataMenuItem = menu.findItem(R.id.toggle_save_form_data);  // Form data can be removed once the minimum API >= 26.
-        MenuItem clearFormDataMenuItem = menu.findItem(R.id.clear_form_data);  // Form data can be removed once the minimum API >= 26.
-        refreshMenuItem = menu.findItem(R.id.refresh);
-        blocklistsMenuItem = menu.findItem(R.id.blocklists);
-        easyListMenuItem = menu.findItem(R.id.easylist);
-        easyPrivacyMenuItem = menu.findItem(R.id.easyprivacy);
-        fanboysAnnoyanceListMenuItem = menu.findItem(R.id.fanboys_annoyance_list);
-        fanboysSocialBlockingListMenuItem = menu.findItem(R.id.fanboys_social_blocking_list);
-        ultraPrivacyMenuItem = menu.findItem(R.id.ultraprivacy);
-        blockAllThirdPartyRequestsMenuItem = menu.findItem(R.id.block_all_third_party_requests);
-        MenuItem adConsentMenuItem = menu.findItem(R.id.ad_consent);
+            // Show the tab linear layout.
+            tabsLinearLayout.setVisibility(View.VISIBLE);
 
-        // Only display third-party cookies if API >= 21
-        toggleThirdPartyCookiesMenuItem.setVisible(Build.VERSION.SDK_INT >= 21);
+            // Show the action bar.
+            actionBar.show();
 
-        // Only display the form data menu items if the API < 26.
-        toggleSaveFormDataMenuItem.setVisible(Build.VERSION.SDK_INT < 26);
-        clearFormDataMenuItem.setVisible(Build.VERSION.SDK_INT < 26);
+            // Show the banner ad in the free flavor.
+            if (BuildConfig.FLAVOR.contentEquals("free")) {
+                // Initialize the ads.  If this isn't the first run, `loadAd()` will be automatically called instead.
+                AdHelper.initializeAds(findViewById(R.id.adview), getApplicationContext(), getSupportFragmentManager(), getString(R.string.google_app_id), getString(R.string.ad_unit_id));
+            }
 
-        // Only show Ad Consent if this is the free flavor.
-        adConsentMenuItem.setVisible(BuildConfig.FLAVOR.contentEquals("free"));
+            // Remove the `SYSTEM_UI` flags from the root frame layout.
+            rootFrameLayout.setSystemUiVisibility(0);
+
+            // Add the translucent status flag.
+            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
+        }
+    }
 
-        // Get the shared preference values.
+    private void initializeApp() {
+        // Get a handle for the shared preferences.
         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
 
-        // Get the status of the additional AppBar icons.
-        displayAdditionalAppBarIcons = sharedPreferences.getBoolean("display_additional_app_bar_icons", false);
+        // Get the theme preference.
+        boolean darkTheme = sharedPreferences.getBoolean("dark_theme", false);
 
-        // Set the status of the additional app bar icons.  Setting the refresh menu item to `SHOW_AS_ACTION_ALWAYS` makes it appear even on small devices like phones.
-        if (displayAdditionalAppBarIcons) {
-            toggleFirstPartyCookiesMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
-            toggleDomStorageMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
-            refreshMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
-        } else { //Do not display the additional icons.
-            toggleFirstPartyCookiesMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
-            toggleDomStorageMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
-            refreshMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
-        }
+        // Get a handle for the input method.
+        InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
 
-        // Replace Refresh with Stop if a URL is already loading.
-        if (urlIsLoading) {
-            // Set the title.
-            refreshMenuItem.setTitle(R.string.stop);
+        // Remove the lint warning below that the input method manager might be null.
+        assert inputMethodManager != null;
 
-            // If the icon is displayed in the AppBar, set it according to the theme.
-            if (displayAdditionalAppBarIcons) {
-                if (darkTheme) {
-                    refreshMenuItem.setIcon(R.drawable.close_dark);
-                } else {
-                    refreshMenuItem.setIcon(R.drawable.close_light);
-                }
-            }
-        }
+        // Initialize the foreground color spans for highlighting the URLs.  We have to use the deprecated `getColor()` until API >= 23.
+        redColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.red_a700));
+        initialGrayColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.gray_500));
+        finalGrayColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.gray_500));
 
-        return true;
-    }
+        // Get handles for the URL views.
+        EditText urlEditText = findViewById(R.id.url_edittext);
 
-    @Override
-    public boolean onPrepareOptionsMenu(Menu menu) {
-        // Get handles for the menu items.
-        MenuItem addOrEditDomain = menu.findItem(R.id.add_or_edit_domain);
-        MenuItem toggleFirstPartyCookiesMenuItem = menu.findItem(R.id.toggle_first_party_cookies);
-        MenuItem toggleThirdPartyCookiesMenuItem = menu.findItem(R.id.toggle_third_party_cookies);
-        MenuItem toggleDomStorageMenuItem = menu.findItem(R.id.toggle_dom_storage);
-        MenuItem toggleSaveFormDataMenuItem = menu.findItem(R.id.toggle_save_form_data);  // Form data can be removed once the minimum API >= 26.
-        MenuItem clearDataMenuItem = menu.findItem(R.id.clear_data);
-        MenuItem clearCookiesMenuItem = menu.findItem(R.id.clear_cookies);
-        MenuItem clearDOMStorageMenuItem = menu.findItem(R.id.clear_dom_storage);
-        MenuItem clearFormDataMenuItem = menu.findItem(R.id.clear_form_data);  // Form data can be removed once the minimum API >= 26.
-        MenuItem fontSizeMenuItem = menu.findItem(R.id.font_size);
-        MenuItem swipeToRefreshMenuItem = menu.findItem(R.id.swipe_to_refresh);
-        MenuItem displayImagesMenuItem = menu.findItem(R.id.display_images);
-        MenuItem nightModeMenuItem = menu.findItem(R.id.night_mode);
-        MenuItem proxyThroughOrbotMenuItem = menu.findItem(R.id.proxy_through_orbot);
+        // Remove the formatting from the URL edit text when the user is editing the text.
+        urlEditText.setOnFocusChangeListener((View v, boolean hasFocus) -> {
+            if (hasFocus) {  // The user is editing the URL text box.
+                // Remove the highlighting.
+                urlEditText.getText().removeSpan(redColorSpan);
+                urlEditText.getText().removeSpan(initialGrayColorSpan);
+                urlEditText.getText().removeSpan(finalGrayColorSpan);
+            } else {  // The user has stopped editing the URL text box.
+                // Move to the beginning of the string.
+                urlEditText.setSelection(0);
 
-        // Set the text for the domain menu item.
-        if (domainSettingsApplied) {
-            addOrEditDomain.setTitle(R.string.edit_domain_settings);
-        } else {
-            addOrEditDomain.setTitle(R.string.add_domain_settings);
-        }
+                // Reapply the highlighting.
+                highlightUrlText();
+            }
+        });
 
-        // Set the status of the menu item checkboxes.
-        toggleFirstPartyCookiesMenuItem.setChecked(firstPartyCookiesEnabled);
-        toggleThirdPartyCookiesMenuItem.setChecked(thirdPartyCookiesEnabled);
-        toggleDomStorageMenuItem.setChecked(domStorageEnabled);
-        toggleSaveFormDataMenuItem.setChecked(saveFormDataEnabled);  // Form data can be removed once the minimum API >= 26.
-        easyListMenuItem.setChecked(easyListEnabled);
-        easyPrivacyMenuItem.setChecked(easyPrivacyEnabled);
-        fanboysAnnoyanceListMenuItem.setChecked(fanboysAnnoyanceListEnabled);
-        fanboysSocialBlockingListMenuItem.setChecked(fanboysSocialBlockingListEnabled);
-        ultraPrivacyMenuItem.setChecked(ultraPrivacyEnabled);
-        blockAllThirdPartyRequestsMenuItem.setChecked(blockAllThirdPartyRequests);
-        swipeToRefreshMenuItem.setChecked(swipeRefreshLayout.isEnabled());
-        displayImagesMenuItem.setChecked(mainWebView.getSettings().getLoadsImagesAutomatically());
-        nightModeMenuItem.setChecked(nightMode);
-        proxyThroughOrbotMenuItem.setChecked(proxyThroughOrbot);
+        // Set the go button on the keyboard to load the URL in `urlTextBox`.
+        urlEditText.setOnKeyListener((View v, int keyCode, KeyEvent event) -> {
+            // If the event is a key-down event on the `enter` button, load the URL.
+            if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {
+                // Load the URL into the mainWebView and consume the event.
+                loadUrlFromTextBox();
 
-        // Enable third-party cookies if first-party cookies are enabled.
-        toggleThirdPartyCookiesMenuItem.setEnabled(firstPartyCookiesEnabled);
+                // If the enter key was pressed, consume the event.
+                return true;
+            } else {
+                // If any other key was pressed, do not consume the event.
+                return false;
+            }
+        });
 
-        // Enable DOM Storage if JavaScript is enabled.
-        toggleDomStorageMenuItem.setEnabled(javaScriptEnabled);
+        // Initialize the Orbot status and the waiting for Orbot trackers.
+        orbotStatus = "unknown";
+        waitingForOrbot = false;
 
-        // Enable Clear Cookies if there are any.
-        clearCookiesMenuItem.setEnabled(cookieManager.hasCookies());
+        // Create an Orbot status `BroadcastReceiver`.
+        orbotStatusBroadcastReceiver = new BroadcastReceiver() {
+            @Override
+            public void onReceive(Context context, Intent intent) {
+                // Store the content of the status message in `orbotStatus`.
+                orbotStatus = intent.getStringExtra("org.torproject.android.intent.extra.STATUS");
 
-        // Get a count of the number of files in the Local Storage directory.
-        File localStorageDirectory = new File (privateDataDirectoryString + "/app_webview/Local Storage/");
-        int localStorageDirectoryNumberOfFiles = 0;
-        if (localStorageDirectory.exists()) {
-            localStorageDirectoryNumberOfFiles = localStorageDirectory.list().length;
-        }
+                // If Privacy Browser is waiting on Orbot, load the website now that Orbot is connected.
+                if (orbotStatus.equals("ON") && waitingForOrbot) {
+                    // Reset the waiting for Orbot status.
+                    waitingForOrbot = false;
 
-        // Get a count of the number of files in the IndexedDB directory.
-        File indexedDBDirectory = new File (privateDataDirectoryString + "/app_webview/IndexedDB");
-        int indexedDBDirectoryNumberOfFiles = 0;
-        if (indexedDBDirectory.exists()) {
-            indexedDBDirectoryNumberOfFiles = indexedDBDirectory.list().length;
-        }
+                    // Get the intent that started the app.
+                    Intent launchingIntent = getIntent();
 
-        // Enable Clear DOM Storage if there is any.
-        clearDOMStorageMenuItem.setEnabled(localStorageDirectoryNumberOfFiles > 0 || indexedDBDirectoryNumberOfFiles > 0);
+                    // Get the information from the intent.
+                    String launchingIntentAction = launchingIntent.getAction();
+                    Uri launchingIntentUriData = launchingIntent.getData();
 
-        // Enable Clear Form Data is there is any.  This can be removed once the minimum API >= 26.
-        if (Build.VERSION.SDK_INT < 26) {
-            WebViewDatabase mainWebViewDatabase = WebViewDatabase.getInstance(this);
-            clearFormDataMenuItem.setEnabled(mainWebViewDatabase.hasFormData());
-        } else {
-            // Disable clear form data because it is not supported on current version of Android.
-            clearFormDataMenuItem.setEnabled(false);
-        }
+                    // If the intent action is a web search, perform the search.
+                    if ((launchingIntentAction != null) && launchingIntentAction.equals(Intent.ACTION_WEB_SEARCH)) {
+                        // Create an encoded URL string.
+                        String encodedUrlString;
 
-        // Enable Clear Data if any of the submenu items are enabled.
-        clearDataMenuItem.setEnabled(clearCookiesMenuItem.isEnabled() || clearDOMStorageMenuItem.isEnabled() || clearFormDataMenuItem.isEnabled());
+                        // Sanitize the search input and convert it to a search.
+                        try {
+                            encodedUrlString = URLEncoder.encode(launchingIntent.getStringExtra(SearchManager.QUERY), "UTF-8");
+                        } catch (UnsupportedEncodingException exception) {
+                            encodedUrlString = "";
+                        }
 
-        // Disable Fanboy's Social Blocking List if Fanboy's Annoyance List is checked.
-        fanboysSocialBlockingListMenuItem.setEnabled(!fanboysAnnoyanceListEnabled);
+                        // Load the completed search URL.
+                        loadUrl(searchURL + encodedUrlString);
+                    } else if (launchingIntentUriData != null){  // Check to see if the intent contains a new URL.
+                        // Load the URL from the intent.
+                        loadUrl(launchingIntentUriData.toString());
+                    } else {  // The is no URL in the intent.
+                        // Select the homepage based on the proxy through Orbot status.
+                        if (proxyThroughOrbot) {
+                            // Load the Tor homepage.
+                            loadUrl(sharedPreferences.getString("tor_homepage", getString(R.string.tor_homepage_default_value)));
+                        } else {
+                            // Load the normal homepage.
+                            loadUrl(sharedPreferences.getString("homepage", getString(R.string.homepage_default_value)));
+                        }
+                    }
+                }
+            }
+        };
 
-        // Initialize the display names for the blocklists with the number of blocked requests.
-        blocklistsMenuItem.setTitle(getString(R.string.blocklists) + " - " + blockedRequests);
-        easyListMenuItem.setTitle(easyListBlockedRequests + " - " + getString(R.string.easylist));
-        easyPrivacyMenuItem.setTitle(easyPrivacyBlockedRequests + " - " + getString(R.string.easyprivacy));
-        fanboysAnnoyanceListMenuItem.setTitle(fanboysAnnoyanceListBlockedRequests + " - " + getString(R.string.fanboys_annoyance_list));
-        fanboysSocialBlockingListMenuItem.setTitle(fanboysSocialBlockingListBlockedRequests + " - " + getString(R.string.fanboys_social_blocking_list));
-        ultraPrivacyMenuItem.setTitle(ultraPrivacyBlockedRequests + " - " + getString(R.string.ultraprivacy));
-        blockAllThirdPartyRequestsMenuItem.setTitle(thirdPartyBlockedRequests + " - " + getString(R.string.block_all_third_party_requests));
+        // Register `orbotStatusBroadcastReceiver` on `this` context.
+        this.registerReceiver(orbotStatusBroadcastReceiver, new IntentFilter("org.torproject.android.intent.action.STATUS"));
 
-        // Get the current user agent.
-        String currentUserAgent = mainWebView.getSettings().getUserAgentString();
+        // Get handles for views that need to be modified.
+        DrawerLayout drawerLayout = findViewById(R.id.drawerlayout);
+        NavigationView navigationView = findViewById(R.id.navigationview);
+        TabLayout tabLayout = findViewById(R.id.tablayout);
+        SwipeRefreshLayout swipeRefreshLayout = findViewById(R.id.swiperefreshlayout);
+        ViewPager webViewPager = findViewById(R.id.webviewpager);
+        ListView bookmarksListView = findViewById(R.id.bookmarks_drawer_listview);
+        FloatingActionButton launchBookmarksActivityFab = findViewById(R.id.launch_bookmarks_activity_fab);
+        FloatingActionButton createBookmarkFolderFab = findViewById(R.id.create_bookmark_folder_fab);
+        FloatingActionButton createBookmarkFab = findViewById(R.id.create_bookmark_fab);
+        EditText findOnPageEditText = findViewById(R.id.find_on_page_edittext);
 
-        // Select the current user agent menu item.  A switch statement cannot be used because the user agents are not compile time constants.
-        if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[0])) {  // Privacy Browser.
-            menu.findItem(R.id.user_agent_privacy_browser).setChecked(true);
-        } else if (currentUserAgent.equals(webViewDefaultUserAgent)) {  // WebView Default.
-            menu.findItem(R.id.user_agent_webview_default).setChecked(true);
-        } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[2])) {  // Firefox on Android.
-            menu.findItem(R.id.user_agent_firefox_on_android).setChecked(true);
-        } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[3])) {  // Chrome on Android.
-            menu.findItem(R.id.user_agent_chrome_on_android).setChecked(true);
-        } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[4])) {  // Safari on iOS.
-            menu.findItem(R.id.user_agent_safari_on_ios).setChecked(true);
-        } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[5])) {  // Firefox on Linux.
-            menu.findItem(R.id.user_agent_firefox_on_linux).setChecked(true);
-        } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[6])) {  // Chromium on Linux.
-            menu.findItem(R.id.user_agent_chromium_on_linux).setChecked(true);
-        } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[7])) {  // Firefox on Windows.
-            menu.findItem(R.id.user_agent_firefox_on_windows).setChecked(true);
-        } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[8])) {  // Chrome on Windows.
-            menu.findItem(R.id.user_agent_chrome_on_windows).setChecked(true);
-        } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[9])) {  // Edge on Windows.
-            menu.findItem(R.id.user_agent_edge_on_windows).setChecked(true);
-        } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[10])) {  // Internet Explorer on Windows.
-            menu.findItem(R.id.user_agent_internet_explorer_on_windows).setChecked(true);
-        } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[11])) {  // Safari on macOS.
-            menu.findItem(R.id.user_agent_safari_on_macos).setChecked(true);
-        } else {  // Custom user agent.
-            menu.findItem(R.id.user_agent_custom).setChecked(true);
-        }
+        // Listen for touches on the navigation menu.
+        navigationView.setNavigationItemSelectedListener(this);
 
-        // Initialize font size variables.
-        int fontSize = mainWebView.getSettings().getTextZoom();
-        String fontSizeTitle;
-        MenuItem selectedFontSizeMenuItem;
+        // Get handles for the navigation menu and the back and forward menu items.  The menu is zero-based.
+        Menu navigationMenu = navigationView.getMenu();
+        MenuItem navigationBackMenuItem = navigationMenu.getItem(2);
+        MenuItem navigationForwardMenuItem = navigationMenu.getItem(3);
+        MenuItem navigationHistoryMenuItem = navigationMenu.getItem(4);
+        MenuItem navigationRequestsMenuItem = navigationMenu.getItem(5);
 
-        // Prepare the font size title and current size menu item.
-        switch (fontSize) {
-            case 25:
-                fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.twenty_five_percent);
-                selectedFontSizeMenuItem = menu.findItem(R.id.font_size_twenty_five_percent);
-                break;
+        // Update the web view pager every time a tab is modified.
+        webViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
+            @Override
+            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
+                // Do nothing.
+            }
 
-            case 50:
-                fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.fifty_percent);
-                selectedFontSizeMenuItem = menu.findItem(R.id.font_size_fifty_percent);
-                break;
+            @Override
+            public void onPageSelected(int position) {
+                // Close the find on page bar if it is open.
+                closeFindOnPage(null);
 
-            case 75:
-                fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.seventy_five_percent);
-                selectedFontSizeMenuItem = menu.findItem(R.id.font_size_seventy_five_percent);
-                break;
+                // Set the current WebView.
+                setCurrentWebView(position);
 
-            case 100:
-                fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.one_hundred_percent);
-                selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_percent);
-                break;
+                // Select the corresponding tab if it does not match the currently selected page.  This will happen if the page was scrolled via swiping in the view pager or by creating a new tab.
+                if (tabLayout.getSelectedTabPosition() != position) {
+                    // Create a handler to select the tab.
+                    Handler selectTabHandler = new Handler();
 
-            case 125:
-                fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.one_hundred_twenty_five_percent);
-                selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_twenty_five_percent);
-                break;
+                    // Create a runnable to select the tab.
+                    Runnable selectTabRunnable = () -> {
+                        // Get a handle for the tab.
+                        TabLayout.Tab tab = tabLayout.getTabAt(position);
 
-            case 150:
-                fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.one_hundred_fifty_percent);
-                selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_fifty_percent);
-                break;
+                        // Assert that the tab is not null.
+                        assert tab != null;
 
-            case 175:
-                fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.one_hundred_seventy_five_percent);
-                selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_seventy_five_percent);
-                break;
+                        // Select the tab.
+                        tab.select();
+                    };
 
-            case 200:
-                fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.two_hundred_percent);
-                selectedFontSizeMenuItem = menu.findItem(R.id.font_size_two_hundred_percent);
-                break;
+                    // Select the tab layout after 150 milliseconds, which leaves enough time for a new tab to be inflated.
+                    selectTabHandler.postDelayed(selectTabRunnable, 150);
+                }
+            }
 
-            default:
-                fontSizeTitle = getString(R.string.font_size) + " - " + getString(R.string.one_hundred_percent);
-                selectedFontSizeMenuItem = menu.findItem(R.id.font_size_one_hundred_percent);
-                break;
-        }
+            @Override
+            public void onPageScrollStateChanged(int state) {
+                // Do nothing.
+            }
+        });
 
-        // Set the font size title and select the current size menu item.
-        fontSizeMenuItem.setTitle(fontSizeTitle);
-        selectedFontSizeMenuItem.setChecked(true);
+        // Display the View SSL Certificate dialog when the currently selected tab is reselected.
+        tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
+            @Override
+            public void onTabSelected(TabLayout.Tab tab) {
+                // Select the same page in the view pager.
+                webViewPager.setCurrentItem(tab.getPosition());
+            }
 
-        // Run all the other default commands.
-        super.onPrepareOptionsMenu(menu);
+            @Override
+            public void onTabUnselected(TabLayout.Tab tab) {
+                // Do nothing.
+            }
 
-        // Display the menu.
-        return true;
-    }
+            @Override
+            public void onTabReselected(TabLayout.Tab tab) {
+                // Instantiate the View SSL Certificate dialog.
+                DialogFragment viewSslCertificateDialogFragment = ViewSslCertificateDialog.displayDialog(currentWebView.getWebViewFragmentId());
 
-    @Override
-    // Remove Android Studio's warning about the dangers of using SetJavaScriptEnabled.
-    @SuppressLint("SetJavaScriptEnabled")
-    // removeAllCookies is deprecated, but it is required for API < 21.
-    @SuppressWarnings("deprecation")
-    public boolean onOptionsItemSelected(MenuItem menuItem) {
-        // Get the selected menu item ID.
-        int menuItemId = menuItem.getItemId();
+                // Display the View SSL Certificate dialog.
+                viewSslCertificateDialogFragment.show(getSupportFragmentManager(), getString(R.string.view_ssl_certificate));
+            }
+        });
 
-        // Set the commands that relate to the menu entries.
-        switch (menuItemId) {
-            case R.id.toggle_javascript:
-                // Switch the status of javaScriptEnabled.
-                javaScriptEnabled = !javaScriptEnabled;
+        // Set the bookmarks drawer resources according to the theme.  This can't be done in the layout due to compatibility issues with the `DrawerLayout` support widget.
+        // The deprecated `getResources().getDrawable()` must be used until the minimum API >= 21 and and `getResources().getColor()` must be used until the minimum API >= 23.
+        if (darkTheme) {
+            launchBookmarksActivityFab.setImageDrawable(getResources().getDrawable(R.drawable.bookmarks_dark));
+            createBookmarkFolderFab.setImageDrawable(getResources().getDrawable(R.drawable.create_folder_dark));
+            createBookmarkFab.setImageDrawable(getResources().getDrawable(R.drawable.create_bookmark_dark));
+            bookmarksListView.setBackgroundColor(getResources().getColor(R.color.gray_850));
+        } else {
+            launchBookmarksActivityFab.setImageDrawable(getResources().getDrawable(R.drawable.bookmarks_light));
+            createBookmarkFolderFab.setImageDrawable(getResources().getDrawable(R.drawable.create_folder_light));
+            createBookmarkFab.setImageDrawable(getResources().getDrawable(R.drawable.create_bookmark_light));
+            bookmarksListView.setBackgroundColor(getResources().getColor(R.color.white));
+        }
 
-                // Apply the new JavaScript status.
-                mainWebView.getSettings().setJavaScriptEnabled(javaScriptEnabled);
+        // Set the launch bookmarks activity FAB to launch the bookmarks activity.
+        launchBookmarksActivityFab.setOnClickListener(v -> {
+            // Get a copy of the favorite icon bitmap.
+            Bitmap favoriteIconBitmap = currentWebView.getFavoriteOrDefaultIcon();
 
-                // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
-                updatePrivacyIcons(true);
+            // Create a favorite icon byte array output stream.
+            ByteArrayOutputStream favoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
 
-                // Display a `Snackbar`.
-                if (javaScriptEnabled) {  // JavaScrip is enabled.
-                    Snackbar.make(findViewById(R.id.main_webview), R.string.javascript_enabled, Snackbar.LENGTH_SHORT).show();
-                } else if (firstPartyCookiesEnabled) {  // JavaScript is disabled, but first-party cookies are enabled.
-                    Snackbar.make(findViewById(R.id.main_webview), R.string.javascript_disabled, Snackbar.LENGTH_SHORT).show();
-                } else {  // Privacy mode.
-                    Snackbar.make(findViewById(R.id.main_webview), R.string.privacy_mode, Snackbar.LENGTH_SHORT).show();
-                }
+            // Convert the favorite icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
+            favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, favoriteIconByteArrayOutputStream);
 
-                // Reload the WebView.
-                mainWebView.reload();
-                return true;
+            // Convert the favorite icon byte array stream to a byte array.
+            byte[] favoriteIconByteArray = favoriteIconByteArrayOutputStream.toByteArray();
 
-            case R.id.add_or_edit_domain:
-                if (domainSettingsApplied) {  // Edit the current domain settings.
-                    // Reapply the domain settings on returning to `MainWebViewActivity`.
-                    reapplyDomainSettingsOnRestart = true;
-                    currentDomainName = "";
+            // Create an intent to launch the bookmarks activity.
+            Intent bookmarksIntent = new Intent(getApplicationContext(), BookmarksActivity.class);
 
-                    // Create an intent to launch the domains activity.
-                    Intent domainsIntent = new Intent(this, DomainsActivity.class);
+            // Add the extra information to the intent.
+            bookmarksIntent.putExtra("current_url", currentWebView.getUrl());
+            bookmarksIntent.putExtra("current_title", currentWebView.getTitle());
+            bookmarksIntent.putExtra("current_folder", currentBookmarksFolder);
+            bookmarksIntent.putExtra("favorite_icon_byte_array", favoriteIconByteArray);
 
-                    // Put extra information instructing the domains activity to directly load the current domain and close on back instead of returning to the domains list.
-                    domainsIntent.putExtra("loadDomain", domainSettingsDatabaseId);
-                    domainsIntent.putExtra("closeOnBack", true);
+            // Make it so.
+            startActivity(bookmarksIntent);
+        });
 
-                    // Make it so.
-                    startActivity(domainsIntent);
-                } else {  // Add a new domain.
-                    // Apply the new domain settings on returning to `MainWebViewActivity`.
-                    reapplyDomainSettingsOnRestart = true;
-                    currentDomainName = "";
+        // Set the create new bookmark folder FAB to display an alert dialog.
+        createBookmarkFolderFab.setOnClickListener(v -> {
+            // Create a create bookmark folder dialog.
+            DialogFragment createBookmarkFolderDialog = CreateBookmarkFolderDialog.createBookmarkFolder(currentWebView.getFavoriteOrDefaultIcon());
 
-                    // Get the current domain
-                    Uri currentUri = Uri.parse(formattedUrlString);
-                    String currentDomain = currentUri.getHost();
+            // Show the create bookmark folder dialog.
+            createBookmarkFolderDialog.show(getSupportFragmentManager(), getString(R.string.create_folder));
+        });
 
-                    // Initialize the database handler.  The `0` specifies the database version, but that is ignored and set instead using a constant in `DomainsDatabaseHelper`.
-                    DomainsDatabaseHelper domainsDatabaseHelper = new DomainsDatabaseHelper(this, null, null, 0);
+        // Set the create new bookmark FAB to display an alert dialog.
+        createBookmarkFab.setOnClickListener(view -> {
+            // Instantiate the create bookmark dialog.
+            DialogFragment createBookmarkDialog = CreateBookmarkDialog.createBookmark(currentWebView.getUrl(), currentWebView.getTitle(), currentWebView.getFavoriteOrDefaultIcon());
 
-                    // Create the domain and store the database ID.
-                    int newDomainDatabaseId = domainsDatabaseHelper.addDomain(currentDomain);
+            // Display the create bookmark dialog.
+            createBookmarkDialog.show(getSupportFragmentManager(), getString(R.string.create_bookmark));
+        });
 
-                    // Create an intent to launch the domains activity.
-                    Intent domainsIntent = new Intent(this, DomainsActivity.class);
+        // Search for the string on the page whenever a character changes in the `findOnPageEditText`.
+        findOnPageEditText.addTextChangedListener(new TextWatcher() {
+            @Override
+            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+                // Do nothing.
+            }
 
-                    // Put extra information instructing the domains activity to directly load the new domain and close on back instead of returning to the domains list.
-                    domainsIntent.putExtra("loadDomain", newDomainDatabaseId);
-                    domainsIntent.putExtra("closeOnBack", true);
+            @Override
+            public void onTextChanged(CharSequence s, int start, int before, int count) {
+                // Do nothing.
+            }
 
-                    // Make it so.
-                    startActivity(domainsIntent);
+            @Override
+            public void afterTextChanged(Editable s) {
+                // Search for the text in the WebView if it is not null.  Sometimes on resume after a period of non-use the WebView will be null.
+                if (currentWebView != null) {
+                    currentWebView.findAllAsync(findOnPageEditText.getText().toString());
                 }
+            }
+        });
+
+        // Set the `check mark` button for the `findOnPageEditText` keyboard to close the soft keyboard.
+        findOnPageEditText.setOnKeyListener((v, keyCode, event) -> {
+            if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {  // The `enter` key was pressed.
+                // Hide the soft keyboard.
+                inputMethodManager.hideSoftInputFromWindow(currentWebView.getWindowToken(), 0);
+
+                // Consume the event.
                 return true;
+            } else {  // A different key was pressed.
+                // Do not consume the event.
+                return false;
+            }
+        });
 
-            case R.id.toggle_first_party_cookies:
-                // Switch the status of firstPartyCookiesEnabled.
-                firstPartyCookiesEnabled = !firstPartyCookiesEnabled;
+        // Implement swipe to refresh.
+        swipeRefreshLayout.setOnRefreshListener(() -> currentWebView.reload());
 
-                // Update the menu checkbox.
-                menuItem.setChecked(firstPartyCookiesEnabled);
+        // Store the default progress view offsets for use later in `initializeWebView()`.
+        defaultProgressViewStartOffset = swipeRefreshLayout.getProgressViewStartOffset();
+        defaultProgressViewEndOffset = swipeRefreshLayout.getProgressViewEndOffset();
 
-                // Apply the new cookie status.
-                cookieManager.setAcceptCookie(firstPartyCookiesEnabled);
+        // Set the swipe to refresh color according to the theme.
+        if (darkTheme) {
+            swipeRefreshLayout.setColorSchemeResources(R.color.blue_800);
+            swipeRefreshLayout.setProgressBackgroundColorSchemeResource(R.color.gray_850);
+        } else {
+            swipeRefreshLayout.setColorSchemeResources(R.color.blue_500);
+        }
 
-                // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
-                updatePrivacyIcons(true);
+        // `DrawerTitle` identifies the `DrawerLayouts` in accessibility mode.
+        drawerLayout.setDrawerTitle(GravityCompat.START, getString(R.string.navigation_drawer));
+        drawerLayout.setDrawerTitle(GravityCompat.END, getString(R.string.bookmarks));
 
-                // Display a `Snackbar`.
-                if (firstPartyCookiesEnabled) {  // First-party cookies are enabled.
-                    Snackbar.make(findViewById(R.id.main_webview), R.string.first_party_cookies_enabled, Snackbar.LENGTH_SHORT).show();
-                } else if (javaScriptEnabled) {  // JavaScript is still enabled.
-                    Snackbar.make(findViewById(R.id.main_webview), R.string.first_party_cookies_disabled, Snackbar.LENGTH_SHORT).show();
-                } else {  // Privacy mode.
-                    Snackbar.make(findViewById(R.id.main_webview), R.string.privacy_mode, Snackbar.LENGTH_SHORT).show();
-                }
+        // Initialize the bookmarks database helper.  The `0` specifies a database version, but that is ignored and set instead using a constant in `BookmarksDatabaseHelper`.
+        bookmarksDatabaseHelper = new BookmarksDatabaseHelper(this, null, null, 0);
 
-                // Reload the WebView.
-                mainWebView.reload();
-                return true;
+        // Initialize `currentBookmarksFolder`.  `""` is the home folder in the database.
+        currentBookmarksFolder = "";
 
-            case R.id.toggle_third_party_cookies:
-                if (Build.VERSION.SDK_INT >= 21) {
-                    // Switch the status of thirdPartyCookiesEnabled.
-                    thirdPartyCookiesEnabled = !thirdPartyCookiesEnabled;
+        // Load the home folder, which is `""` in the database.
+        loadBookmarksFolder();
 
-                    // Update the menu checkbox.
-                    menuItem.setChecked(thirdPartyCookiesEnabled);
+        bookmarksListView.setOnItemClickListener((parent, view, position, id) -> {
+            // Convert the id from long to int to match the format of the bookmarks database.
+            int databaseID = (int) id;
+
+            // Get the bookmark cursor for this ID and move it to the first row.
+            Cursor bookmarkCursor = bookmarksDatabaseHelper.getBookmark(databaseID);
+            bookmarkCursor.moveToFirst();
 
-                    // Apply the new cookie status.
-                    cookieManager.setAcceptThirdPartyCookies(mainWebView, thirdPartyCookiesEnabled);
+            // Act upon the bookmark according to the type.
+            if (bookmarkCursor.getInt(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.IS_FOLDER)) == 1) {  // The selected bookmark is a folder.
+                // Store the new folder name in `currentBookmarksFolder`.
+                currentBookmarksFolder = bookmarkCursor.getString(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
 
-                    // Display a `Snackbar`.
-                    if (thirdPartyCookiesEnabled) {
-                        Snackbar.make(findViewById(R.id.main_webview), R.string.third_party_cookies_enabled, Snackbar.LENGTH_SHORT).show();
-                    } else {
-                        Snackbar.make(findViewById(R.id.main_webview), R.string.third_party_cookies_disabled, Snackbar.LENGTH_SHORT).show();
-                    }
+                // Load the new folder.
+                loadBookmarksFolder();
+            } else {  // The selected bookmark is not a folder.
+                // Load the bookmark URL.
+                loadUrl(bookmarkCursor.getString(bookmarkCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_URL)));
 
-                    // Reload the WebView.
-                    mainWebView.reload();
-                } // Else do nothing because SDK < 21.
-                return true;
+                // Close the bookmarks drawer.
+                drawerLayout.closeDrawer(GravityCompat.END);
+            }
 
-            case R.id.toggle_dom_storage:
-                // Switch the status of domStorageEnabled.
-                domStorageEnabled = !domStorageEnabled;
+            // Close the `Cursor`.
+            bookmarkCursor.close();
+        });
 
-                // Update the menu checkbox.
-                menuItem.setChecked(domStorageEnabled);
+        bookmarksListView.setOnItemLongClickListener((parent, view, position, id) -> {
+            // Convert the database ID from `long` to `int`.
+            int databaseId = (int) id;
 
-                // Apply the new DOM Storage status.
-                mainWebView.getSettings().setDomStorageEnabled(domStorageEnabled);
+            // Find out if the selected bookmark is a folder.
+            boolean isFolder = bookmarksDatabaseHelper.isFolder(databaseId);
 
-                // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
-                updatePrivacyIcons(true);
+            if (isFolder) {
+                // Save the current folder name, which is used in `onSaveEditBookmarkFolder()`.
+                oldFolderNameString = bookmarksCursor.getString(bookmarksCursor.getColumnIndex(BookmarksDatabaseHelper.BOOKMARK_NAME));
 
-                // Display a `Snackbar`.
-                if (domStorageEnabled) {
-                    Snackbar.make(findViewById(R.id.main_webview), R.string.dom_storage_enabled, Snackbar.LENGTH_SHORT).show();
-                } else {
-                    Snackbar.make(findViewById(R.id.main_webview), R.string.dom_storage_disabled, Snackbar.LENGTH_SHORT).show();
-                }
+                // Show the edit bookmark folder `AlertDialog` and name the instance `@string/edit_folder`.
+                DialogFragment editBookmarkFolderDialog = EditBookmarkFolderDialog.folderDatabaseId(databaseId, currentWebView.getFavoriteOrDefaultIcon());
+                editBookmarkFolderDialog.show(getSupportFragmentManager(), getString(R.string.edit_folder));
+            } else {
+                // Show the edit bookmark `AlertDialog` and name the instance `@string/edit_bookmark`.
+                DialogFragment editBookmarkDialog = EditBookmarkDialog.bookmarkDatabaseId(databaseId, currentWebView.getFavoriteOrDefaultIcon());
+                editBookmarkDialog.show(getSupportFragmentManager(), getString(R.string.edit_bookmark));
+            }
 
-                // Reload the WebView.
-                mainWebView.reload();
-                return true;
+            // Consume the event.
+            return true;
+        });
 
-            // Form data can be removed once the minimum API >= 26.
-            case R.id.toggle_save_form_data:
-                // Switch the status of saveFormDataEnabled.
-                saveFormDataEnabled = !saveFormDataEnabled;
+        // Get the status bar pixel size.
+        int statusBarResourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
+        int statusBarPixelSize = getResources().getDimensionPixelSize(statusBarResourceId);
 
-                // Update the menu checkbox.
-                menuItem.setChecked(saveFormDataEnabled);
+        // Get the resource density.
+        float screenDensity = getResources().getDisplayMetrics().density;
 
-                // Apply the new form data status.
-                mainWebView.getSettings().setSaveFormData(saveFormDataEnabled);
+        // Calculate the drawer header padding.  This is used to move the text in the drawer headers below any cutouts.
+        drawerHeaderPaddingLeftAndRight = (int) (15 * screenDensity);
+        drawerHeaderPaddingTop = statusBarPixelSize + (int) (4 * screenDensity);
+        drawerHeaderPaddingBottom = (int) (8 * screenDensity);
 
-                // Display a `Snackbar`.
-                if (saveFormDataEnabled) {
-                    Snackbar.make(findViewById(R.id.main_webview), R.string.form_data_enabled, Snackbar.LENGTH_SHORT).show();
-                } else {
-                    Snackbar.make(findViewById(R.id.main_webview), R.string.form_data_disabled, Snackbar.LENGTH_SHORT).show();
-                }
+        // The drawer listener is used to update the navigation menu.`
+        drawerLayout.addDrawerListener(new DrawerLayout.DrawerListener() {
+            @Override
+            public void onDrawerSlide(@NonNull View drawerView, float slideOffset) {
+            }
 
-                // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.
-                updatePrivacyIcons(true);
+            @Override
+            public void onDrawerOpened(@NonNull View drawerView) {
+            }
 
-                // Reload the WebView.
-                mainWebView.reload();
-                return true;
+            @Override
+            public void onDrawerClosed(@NonNull View drawerView) {
+            }
 
-            case R.id.clear_cookies:
-                Snackbar.make(findViewById(R.id.main_webview), R.string.cookies_deleted, Snackbar.LENGTH_LONG)
-                        .setAction(R.string.undo, v -> {
-                            // Do nothing because everything will be handled by `onDismissed()` below.
-                        })
-                        .addCallback(new Snackbar.Callback() {
-                            @Override
-                            public void onDismissed(Snackbar snackbar, int event) {
-                                switch (event) {
-                                    // The user pushed the `Undo` button.
-                                    case Snackbar.Callback.DISMISS_EVENT_ACTION:
-                                        // Do nothing.
-                                        break;
-
-                                    // The `Snackbar` was dismissed without the `Undo` button being pushed.
-                                    default:
-                                        // `cookieManager.removeAllCookie()` varies by SDK.
-                                        if (Build.VERSION.SDK_INT < 21) {
-                                            cookieManager.removeAllCookie();
-                                        } else {
-                                            // `null` indicates no callback.
-                                            cookieManager.removeAllCookies(null);
-                                        }
-                                }
-                            }
-                        })
-                        .show();
-                return true;
+            @Override
+            public void onDrawerStateChanged(int newState) {
+                if ((newState == DrawerLayout.STATE_SETTLING) || (newState == DrawerLayout.STATE_DRAGGING)) {  // A drawer is opening or closing.
+                    // Get handles for the drawer headers.
+                    TextView navigationHeaderTextView = findViewById(R.id.navigationText);
+                    TextView bookmarksHeaderTextView = findViewById(R.id.bookmarks_title_textview);
 
-            case R.id.clear_dom_storage:
-                Snackbar.make(findViewById(R.id.main_webview), R.string.dom_storage_deleted, Snackbar.LENGTH_LONG)
-                        .setAction(R.string.undo, v -> {
-                            // Do nothing because everything will be handled by `onDismissed()` below.
-                        })
-                        .addCallback(new Snackbar.Callback() {
-                            @Override
-                            public void onDismissed(Snackbar snackbar, int event) {
-                                switch (event) {
-                                    // The user pushed the `Undo` button.
-                                    case Snackbar.Callback.DISMISS_EVENT_ACTION:
-                                        // Do nothing.
-                                        break;
-
-                                    // The `Snackbar` was dismissed without the `Undo` button being pushed.
-                                    default:
-                                        // Delete the DOM Storage.
-                                        WebStorage webStorage = WebStorage.getInstance();
-                                        webStorage.deleteAllData();
-
-                                        // Initialize a handler to manually delete the DOM storage files and directories.
-                                        Handler deleteDomStorageHandler = new Handler();
-
-                                        // Setup a runnable to manually delete the DOM storage files and directories.
-                                        Runnable deleteDomStorageRunnable = () -> {
-                                            try {
-                                                // A `String[]` must be used because the directory contains a space and `Runtime.exec` will otherwise not escape the string correctly.
-                                                privacyBrowserRuntime.exec(new String[]{"rm", "-rf", privateDataDirectoryString + "/app_webview/Local Storage/"});
-
-                                                // Multiple commands must be used because `Runtime.exec()` does not like `*`.
-                                                privacyBrowserRuntime.exec("rm -rf " + privateDataDirectoryString + "/app_webview/IndexedDB");
-                                                privacyBrowserRuntime.exec("rm -f " + privateDataDirectoryString + "/app_webview/QuotaManager");
-                                                privacyBrowserRuntime.exec("rm -f " + privateDataDirectoryString + "/app_webview/QuotaManager-journal");
-                                                privacyBrowserRuntime.exec("rm -rf " + privateDataDirectoryString + "/app_webview/databases");
-                                            } catch (IOException e) {
-                                                // Do nothing if an error is thrown.
-                                            }
-                                        };
-
-                                        // Manually delete the DOM storage files after 200 milliseconds.
-                                        deleteDomStorageHandler.postDelayed(deleteDomStorageRunnable, 200);
-                                }
-                            }
-                        })
-                        .show();
-                return true;
+                    // Apply the navigation header paddings if the view is not null (sometimes it is null if another activity has already started).  This moves the text in the header below any cutouts.
+                    if (navigationHeaderTextView != null) {
+                        navigationHeaderTextView.setPadding(drawerHeaderPaddingLeftAndRight, drawerHeaderPaddingTop, drawerHeaderPaddingLeftAndRight, drawerHeaderPaddingBottom);
+                    }
 
-            // Form data can be remove once the minimum API >= 26.
-            case R.id.clear_form_data:
-                Snackbar.make(findViewById(R.id.main_webview), R.string.form_data_deleted, Snackbar.LENGTH_LONG)
-                        .setAction(R.string.undo, v -> {
-                            // Do nothing because everything will be handled by `onDismissed()` below.
-                        })
-                        .addCallback(new Snackbar.Callback() {
-                            @Override
-                            public void onDismissed(Snackbar snackbar, int event) {
-                                switch (event) {
-                                    // The user pushed the `Undo` button.
-                                    case Snackbar.Callback.DISMISS_EVENT_ACTION:
-                                        // Do nothing.
-                                        break;
-
-                                    // The `Snackbar` was dismissed without the `Undo` button being pushed.
-                                    default:
-                                        // Delete the form data.
-                                        WebViewDatabase mainWebViewDatabase = WebViewDatabase.getInstance(getApplicationContext());
-                                        mainWebViewDatabase.clearFormData();
-                                }
-                            }
-                        })
-                        .show();
-                return true;
+                    // Apply the bookmarks header paddings if the view is not null (sometimes it is null if another activity has already started).  This moves the text in the header below any cutouts.
+                    if (bookmarksHeaderTextView != null) {
+                        bookmarksHeaderTextView.setPadding(drawerHeaderPaddingLeftAndRight, drawerHeaderPaddingTop, drawerHeaderPaddingLeftAndRight, drawerHeaderPaddingBottom);
+                    }
+
+                    // Update the navigation menu items if the WebView is not null.
+                    if (currentWebView != null) {
+                        navigationBackMenuItem.setEnabled(currentWebView.canGoBack());
+                        navigationForwardMenuItem.setEnabled(currentWebView.canGoForward());
+                        navigationHistoryMenuItem.setEnabled((currentWebView.canGoBack() || currentWebView.canGoForward()));
+                        navigationRequestsMenuItem.setTitle(getString(R.string.requests) + " - " + currentWebView.getRequestsCount(NestedScrollWebView.BLOCKED_REQUESTS));
 
-            case R.id.easylist:
-                // Toggle the EasyList status.
-                easyListEnabled = !easyListEnabled;
+                        // Hide the keyboard (if displayed).
+                        inputMethodManager.hideSoftInputFromWindow(currentWebView.getWindowToken(), 0);
+                    }
 
-                // Update the menu checkbox.
-                menuItem.setChecked(easyListEnabled);
+                    // Clear the focus from from the URL text box and the WebView.  This removes any text selection markers and context menus, which otherwise draw above the open drawers.
+                    urlEditText.clearFocus();
+                    currentWebView.clearFocus();
+                }
+            }
+        });
 
-                // Reload the main WebView.
-                mainWebView.reload();
-                return true;
+        // Replace the header that `WebView` creates for `X-Requested-With` with a null value.  The default value is the application ID (com.stoutner.privacybrowser.standard).
+        customHeaders.put("X-Requested-With", "");
 
-            case R.id.easyprivacy:
-                // Toggle the EasyPrivacy status.
-                easyPrivacyEnabled = !easyPrivacyEnabled;
+        // Inflate a bare WebView to get the default user agent.  It is not used to render content on the screen.
+        @SuppressLint("InflateParams") View webViewLayout = getLayoutInflater().inflate(R.layout.bare_webview, null, false);
 
-                // Update the menu checkbox.
-                menuItem.setChecked(easyPrivacyEnabled);
+        // Get a handle for the WebView.
+        WebView bareWebView = webViewLayout.findViewById(R.id.bare_webview);
 
-                // Reload the main WebView.
-                mainWebView.reload();
-                return true;
+        // Store the default user agent.
+        webViewDefaultUserAgent = bareWebView.getSettings().getUserAgentString();
 
-            case R.id.fanboys_annoyance_list:
-                // Toggle Fanboy's Annoyance List status.
-                fanboysAnnoyanceListEnabled = !fanboysAnnoyanceListEnabled;
+        // Destroy the bare WebView.
+        bareWebView.destroy();
+    }
 
-                // Update the menu checkbox.
-                menuItem.setChecked(fanboysAnnoyanceListEnabled);
+    // `reloadWebsite` is used if returning from the Domains activity.  Otherwise JavaScript might not function correctly if it is newly enabled.
+    @SuppressLint("SetJavaScriptEnabled")
+    private boolean applyDomainSettings(NestedScrollWebView nestedScrollWebView, String url, boolean resetTab, boolean reloadWebsite) {
+        // Store a copy of the current user agent to track changes for the return boolean.
+        String initialUserAgent = nestedScrollWebView.getSettings().getUserAgentString();
 
-                // Update the staus of Fanboy's Social Blocking List.
-                MenuItem fanboysSocialBlockingListMenuItem = mainMenu.findItem(R.id.fanboys_social_blocking_list);
-                fanboysSocialBlockingListMenuItem.setEnabled(!fanboysAnnoyanceListEnabled);
+        // Parse the URL into a URI.
+        Uri uri = Uri.parse(url);
 
-                // Reload the main WebView.
-                mainWebView.reload();
-                return true;
+        // Extract the domain from `uri`.
+        String newHostName = uri.getHost();
 
-            case R.id.fanboys_social_blocking_list:
-                // Toggle Fanboy's Social Blocking List status.
-                fanboysSocialBlockingListEnabled = !fanboysSocialBlockingListEnabled;
+        // Strings don't like to be null.
+        if (newHostName == null) {
+            newHostName = "";
+        }
 
-                // Update the menu checkbox.
-                menuItem.setChecked(fanboysSocialBlockingListEnabled);
+        // Apply the domain settings if a new domain is being loaded or if the new domain is blank.  This allows the user to set temporary settings for JavaScript, cookies, DOM storage, etc.
+        if (!nestedScrollWebView.getCurrentDomainName().equals(newHostName) || newHostName.equals("")) {
+            // Set the new host name as the current domain name.
+            nestedScrollWebView.setCurrentDomainName(newHostName);
 
-                // Reload the main WebView.
-                mainWebView.reload();
-                return true;
+            // Reset the ignoring of pinned domain information.
+            nestedScrollWebView.setIgnorePinnedDomainInformation(false);
 
-            case R.id.ultraprivacy:
-                // Toggle the UltraPrivacy status.
-                ultraPrivacyEnabled = !ultraPrivacyEnabled;
+            // Clear any pinned SSL certificate or IP addresses.
+            nestedScrollWebView.clearPinnedSslCertificate();
+            nestedScrollWebView.clearPinnedIpAddresses();
 
-                // Update the menu checkbox.
-                menuItem.setChecked(ultraPrivacyEnabled);
+            // Reset the favorite icon if specified.
+            if (resetTab) {
+                // Initialize the favorite icon.
+                nestedScrollWebView.initializeFavoriteIcon();
 
-                // Reload the main WebView.
-                mainWebView.reload();
-                return true;
+                // Get the current page position.
+                int currentPagePosition = webViewPagerAdapter.getPositionForId(nestedScrollWebView.getWebViewFragmentId());
 
-            case R.id.block_all_third_party_requests:
-                //Toggle the third-party requests blocker status.
-                blockAllThirdPartyRequests = !blockAllThirdPartyRequests;
+                // Get a handle for the tab layout.
+                TabLayout tabLayout = findViewById(R.id.tablayout);
 
-                // Update the menu checkbox.
-                menuItem.setChecked(blockAllThirdPartyRequests);
+                // Get the corresponding tab.
+                TabLayout.Tab tab = tabLayout.getTabAt(currentPagePosition);
 
-                // Reload the main WebView.
-                mainWebView.reload();
-                return true;
+                // Update the tab if it isn't null, which sometimes happens when restarting from the background.
+                if (tab != null) {
+                    // Get the tab custom view.
+                    View tabCustomView = tab.getCustomView();
 
-            case R.id.user_agent_privacy_browser:
-                // Update the user agent.
-                mainWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[0]);
+                    // Remove the warning below that the tab custom view might be null.
+                    assert tabCustomView != null;
 
-                // Reload the WebView.
-                mainWebView.reload();
-                return true;
+                    // Get the tab views.
+                    ImageView tabFavoriteIconImageView = tabCustomView.findViewById(R.id.favorite_icon_imageview);
+                    TextView tabTitleTextView = tabCustomView.findViewById(R.id.title_textview);
 
-            case R.id.user_agent_webview_default:
-                // Update the user agent.
-                mainWebView.getSettings().setUserAgentString("");
+                    // Set the default favorite icon as the favorite icon for this tab.
+                    tabFavoriteIconImageView.setImageBitmap(Bitmap.createScaledBitmap(nestedScrollWebView.getFavoriteOrDefaultIcon(), 64, 64, true));
 
-                // Reload the WebView.
-                mainWebView.reload();
-                return true;
+                    // Set the loading title text.
+                    tabTitleTextView.setText(R.string.loading);
+                }
+            }
 
-            case R.id.user_agent_firefox_on_android:
-                // Update the user agent.
-                mainWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[2]);
+            // Initialize the database handler.  The `0` specifies the database version, but that is ignored and set instead using a constant in `DomainsDatabaseHelper`.
+            DomainsDatabaseHelper domainsDatabaseHelper = new DomainsDatabaseHelper(this, null, null, 0);
 
-                // Reload the WebView.
-                mainWebView.reload();
-                return true;
+            // Get a full cursor from `domainsDatabaseHelper`.
+            Cursor domainNameCursor = domainsDatabaseHelper.getDomainNameCursorOrderedByDomain();
 
-            case R.id.user_agent_chrome_on_android:
-                // Update the user agent.
-                mainWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[3]);
+            // Initialize `domainSettingsSet`.
+            Set<String> domainSettingsSet = new HashSet<>();
 
-                // Reload the WebView.
-                mainWebView.reload();
-                return true;
+            // Get the domain name column index.
+            int domainNameColumnIndex = domainNameCursor.getColumnIndex(DomainsDatabaseHelper.DOMAIN_NAME);
 
-            case R.id.user_agent_safari_on_ios:
-                // Update the user agent.
-                mainWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[4]);
+            // Populate `domainSettingsSet`.
+            for (int i = 0; i < domainNameCursor.getCount(); i++) {
+                // Move `domainsCursor` to the current row.
+                domainNameCursor.moveToPosition(i);
 
-                // Reload the WebView.
-                mainWebView.reload();
-                return true;
+                // Store the domain name in `domainSettingsSet`.
+                domainSettingsSet.add(domainNameCursor.getString(domainNameColumnIndex));
+            }
 
-            case R.id.user_agent_firefox_on_linux:
-                // Update the user agent.
-                mainWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[5]);
+            // Close `domainNameCursor.
+            domainNameCursor.close();
 
-                // Reload the WebView.
-                mainWebView.reload();
-                return true;
+            // Initialize the domain name in database variable.
+            String domainNameInDatabase = null;
 
-            case R.id.user_agent_chromium_on_linux:
-                // Update the user agent.
-                mainWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[6]);
+            // Check the hostname against the domain settings set.
+            if (domainSettingsSet.contains(newHostName)) {  // The hostname is contained in the domain settings set.
+                // Record the domain name in the database.
+                domainNameInDatabase = newHostName;
 
-                // Reload the WebView.
-                mainWebView.reload();
-                return true;
+                // Set the domain settings applied tracker to true.
+                nestedScrollWebView.setDomainSettingsApplied(true);
+            } else {  // The hostname is not contained in the domain settings set.
+                // Set the domain settings applied tracker to false.
+                nestedScrollWebView.setDomainSettingsApplied(false);
+            }
 
-            case R.id.user_agent_firefox_on_windows:
-                // Update the user agent.
-                mainWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[7]);
+            // Check all the subdomains of the host name against wildcard domains in the domain cursor.
+            while (!nestedScrollWebView.getDomainSettingsApplied() && newHostName.contains(".")) {  // Stop checking if domain settings are already applied or there are no more `.` in the host name.
+                if (domainSettingsSet.contains("*." + newHostName)) {  // Check the host name prepended by `*.`.
+                    // Set the domain settings applied tracker to true.
+                    nestedScrollWebView.setDomainSettingsApplied(true);
 
-                // Reload the WebView.
-                mainWebView.reload();
-                return true;
+                    // Store the applied domain names as it appears in the database.
+                    domainNameInDatabase = "*." + newHostName;
+                }
 
-            case R.id.user_agent_chrome_on_windows:
-                // Update the user agent.
-                mainWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[8]);
+                // Strip out the lowest subdomain of of the host name.
+                newHostName = newHostName.substring(newHostName.indexOf(".") + 1);
+            }
 
-                // Reload the WebView.
-                mainWebView.reload();
-                return true;
 
-            case R.id.user_agent_edge_on_windows:
-                // Update the user agent.
-                mainWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[9]);
+            // Get a handle for the shared preferences.
+            SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
 
-                // Reload the WebView.
-                mainWebView.reload();
-                return true;
+            // Store the general preference information.
+            String defaultFontSizeString = sharedPreferences.getString("font_size", getString(R.string.font_size_default_value));
+            String defaultUserAgentName = sharedPreferences.getString("user_agent", getString(R.string.user_agent_default_value));
+            boolean defaultSwipeToRefresh = sharedPreferences.getBoolean("swipe_to_refresh", true);
+            boolean darkTheme = sharedPreferences.getBoolean("dark_theme", false);
+            boolean wideViewport = sharedPreferences.getBoolean("wide_viewport", true);
+            boolean displayWebpageImages = sharedPreferences.getBoolean("display_webpage_images", true);
 
-            case R.id.user_agent_internet_explorer_on_windows:
-                // Update the user agent.
-                mainWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[10]);
+            // Get a handle for the cookie manager.
+            CookieManager cookieManager = CookieManager.getInstance();
 
-                // Reload the WebView.
-                mainWebView.reload();
-                return true;
+            // Get handles for the views.
+            RelativeLayout urlRelativeLayout = findViewById(R.id.url_relativelayout);
+            SwipeRefreshLayout swipeRefreshLayout = findViewById(R.id.swiperefreshlayout);
 
-            case R.id.user_agent_safari_on_macos:
-                // Update the user agent.
-                mainWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[11]);
+            // Initialize the user agent array adapter and string array.
+            ArrayAdapter<CharSequence> userAgentNamesArray = ArrayAdapter.createFromResource(this, R.array.user_agent_names, R.layout.spinner_item);
+            String[] userAgentDataArray = getResources().getStringArray(R.array.user_agent_data);
 
-                // Reload the WebView.
-                mainWebView.reload();
-                return true;
+            if (nestedScrollWebView.getDomainSettingsApplied()) {  // The url has custom domain settings.
+                // Get a cursor for the current host and move it to the first position.
+                Cursor currentDomainSettingsCursor = domainsDatabaseHelper.getCursorForDomainName(domainNameInDatabase);
+                currentDomainSettingsCursor.moveToFirst();
 
-            case R.id.user_agent_custom:
-                // Update the user agent.
-                mainWebView.getSettings().setUserAgentString(defaultCustomUserAgentString);
+                // Get the settings from the cursor.
+                nestedScrollWebView.setDomainSettingsDatabaseId(currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper._ID)));
+                nestedScrollWebView.setDomainSettingsJavaScriptEnabled(currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_JAVASCRIPT)) == 1);
+                nestedScrollWebView.setAcceptFirstPartyCookies(currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_FIRST_PARTY_COOKIES)) == 1);
+                boolean domainThirdPartyCookiesEnabled = (currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_THIRD_PARTY_COOKIES)) == 1);
+                nestedScrollWebView.getSettings().setDomStorageEnabled(currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_DOM_STORAGE)) == 1);
+                // Form data can be removed once the minimum API >= 26.
+                boolean saveFormData = (currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_FORM_DATA)) == 1);
+                nestedScrollWebView.enableBlocklist(NestedScrollWebView.EASY_LIST,
+                        currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_EASYLIST)) == 1);
+                nestedScrollWebView.enableBlocklist(NestedScrollWebView.EASY_PRIVACY,
+                        currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_EASYPRIVACY)) == 1);
+                nestedScrollWebView.enableBlocklist(NestedScrollWebView.FANBOYS_ANNOYANCE_LIST,
+                        currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_FANBOYS_ANNOYANCE_LIST)) == 1);
+                nestedScrollWebView.enableBlocklist(NestedScrollWebView.FANBOYS_SOCIAL_BLOCKING_LIST,
+                        currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_FANBOYS_SOCIAL_BLOCKING_LIST)) == 1);
+                nestedScrollWebView.enableBlocklist(NestedScrollWebView.ULTRA_PRIVACY,
+                        currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.ENABLE_ULTRAPRIVACY)) == 1);
+                nestedScrollWebView.enableBlocklist(NestedScrollWebView.THIRD_PARTY_REQUESTS,
+                        currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.BLOCK_ALL_THIRD_PARTY_REQUESTS)) == 1);
+                String userAgentName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.USER_AGENT));
+                int fontSize = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.FONT_SIZE));
+                int swipeToRefreshInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.SWIPE_TO_REFRESH));
+                int nightModeInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.NIGHT_MODE));
+                int wideViewportInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.WIDE_VIEWPORT));
+                int displayWebpageImagesInt = currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.DISPLAY_IMAGES));
+                boolean pinnedSslCertificate = (currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.PINNED_SSL_CERTIFICATE)) == 1);
+                String pinnedSslIssuedToCName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.SSL_ISSUED_TO_COMMON_NAME));
+                String pinnedSslIssuedToOName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.SSL_ISSUED_TO_ORGANIZATION));
+                String pinnedSslIssuedToUName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.SSL_ISSUED_TO_ORGANIZATIONAL_UNIT));
+                String pinnedSslIssuedByCName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.SSL_ISSUED_BY_COMMON_NAME));
+                String pinnedSslIssuedByOName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.SSL_ISSUED_BY_ORGANIZATION));
+                String pinnedSslIssuedByUName = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.SSL_ISSUED_BY_ORGANIZATIONAL_UNIT));
+                boolean pinnedIpAddresses = (currentDomainSettingsCursor.getInt(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.PINNED_IP_ADDRESSES)) == 1);
+                String pinnedHostIpAddresses = currentDomainSettingsCursor.getString(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.IP_ADDRESSES));
+
+                // Create the pinned SSL date variables.
+                Date pinnedSslStartDate;
+                Date pinnedSslEndDate;
+
+                // Set the pinned SSL certificate start date to `null` if the saved date `long` is 0 because creating a new Date results in an error if the input is 0.
+                if (currentDomainSettingsCursor.getLong(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.SSL_START_DATE)) == 0) {
+                    pinnedSslStartDate = null;
+                } else {
+                    pinnedSslStartDate = new Date(currentDomainSettingsCursor.getLong(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.SSL_START_DATE)));
+                }
 
-                // Reload the WebView.
-                mainWebView.reload();
-                return true;
+                // Set the pinned SSL certificate end date to `null` if the saved date `long` is 0 because creating a new Date results in an error if the input is 0.
+                if (currentDomainSettingsCursor.getLong(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.SSL_END_DATE)) == 0) {
+                    pinnedSslEndDate = null;
+                } else {
+                    pinnedSslEndDate = new Date(currentDomainSettingsCursor.getLong(currentDomainSettingsCursor.getColumnIndex(DomainsDatabaseHelper.SSL_END_DATE)));
+                }
 
-            case R.id.font_size_twenty_five_percent:
-                mainWebView.getSettings().setTextZoom(25);
-                return true;
+                // If there is a pinned SSL certificate, store it in the WebView.
+                if (pinnedSslCertificate) {
+                    nestedScrollWebView.setPinnedSslCertificate(pinnedSslIssuedToCName, pinnedSslIssuedToOName, pinnedSslIssuedToUName, pinnedSslIssuedByCName, pinnedSslIssuedByOName, pinnedSslIssuedByUName,
+                            pinnedSslStartDate, pinnedSslEndDate);
+                }
 
-            case R.id.font_size_fifty_percent:
-                mainWebView.getSettings().setTextZoom(50);
-                return true;
+                // If there is a pinned IP address, store it in the WebView.
+                if (pinnedIpAddresses) {
+                    nestedScrollWebView.setPinnedIpAddresses(pinnedHostIpAddresses);
+                }
 
-            case R.id.font_size_seventy_five_percent:
-                mainWebView.getSettings().setTextZoom(75);
-                return true;
+                // Set night mode according to the night mode int.
+                switch (nightModeInt) {
+                    case DomainsDatabaseHelper.SYSTEM_DEFAULT:
+                        // Set night mode according to the current default.
+                        nestedScrollWebView.setNightMode(sharedPreferences.getBoolean("night_mode", false));
+                        break;
 
-            case R.id.font_size_one_hundred_percent:
-                mainWebView.getSettings().setTextZoom(100);
-                return true;
+                    case DomainsDatabaseHelper.ENABLED:
+                        // Enable night mode.
+                        nestedScrollWebView.setNightMode(true);
+                        break;
 
-            case R.id.font_size_one_hundred_twenty_five_percent:
-                mainWebView.getSettings().setTextZoom(125);
-                return true;
+                    case DomainsDatabaseHelper.DISABLED:
+                        // Disable night mode.
+                        nestedScrollWebView.setNightMode(false);
+                        break;
+                }
 
-            case R.id.font_size_one_hundred_fifty_percent:
-                mainWebView.getSettings().setTextZoom(150);
-                return true;
+                // Enable JavaScript if night mode is enabled.
+                if (nestedScrollWebView.getNightMode()) {
+                    // Enable JavaScript.
+                    nestedScrollWebView.getSettings().setJavaScriptEnabled(true);
+                } else {
+                    // Set JavaScript according to the domain settings.
+                    nestedScrollWebView.getSettings().setJavaScriptEnabled(nestedScrollWebView.getDomainSettingsJavaScriptEnabled());
+                }
 
-            case R.id.font_size_one_hundred_seventy_five_percent:
-                mainWebView.getSettings().setTextZoom(175);
-                return true;
+                // Close the current host domain settings cursor.
+                currentDomainSettingsCursor.close();
 
-            case R.id.font_size_two_hundred_percent:
-                mainWebView.getSettings().setTextZoom(200);
-                return true;
+                // Apply the domain settings.
+                cookieManager.setAcceptCookie(nestedScrollWebView.getAcceptFirstPartyCookies());
 
-            case R.id.swipe_to_refresh:
-                // Toggle swipe to refresh.
-                swipeRefreshLayout.setEnabled(!swipeRefreshLayout.isEnabled());
-                return true;
+                // Set third-party cookies status if API >= 21.
+                if (Build.VERSION.SDK_INT >= 21) {
+                    cookieManager.setAcceptThirdPartyCookies(nestedScrollWebView, domainThirdPartyCookiesEnabled);
+                }
 
-            case R.id.display_images:
-                if (mainWebView.getSettings().getLoadsImagesAutomatically()) {  // Images are currently loaded automatically.
-                    mainWebView.getSettings().setLoadsImagesAutomatically(false);
-                    mainWebView.reload();
-                } else {  // Images are not currently loaded automatically.
-                    mainWebView.getSettings().setLoadsImagesAutomatically(true);
+                // Apply the form data setting if the API < 26.
+                if (Build.VERSION.SDK_INT < 26) {
+                    nestedScrollWebView.getSettings().setSaveFormData(saveFormData);
                 }
-                return true;
 
-            case R.id.night_mode:
-                // Toggle night mode.
-                nightMode = !nightMode;
+                // Apply the font size.
+                if (fontSize == 0) {  // Apply the default font size.
+                    nestedScrollWebView.getSettings().setTextZoom(Integer.valueOf(defaultFontSizeString));
+                } else {  // Apply the specified font size.
+                    nestedScrollWebView.getSettings().setTextZoom(fontSize);
+                }
 
-                // Enable or disable JavaScript according to night mode, the global preference, and any domain settings.
-                if (nightMode) {  // Night mode is enabled.  Enable JavaScript.
-                    // Update the global variable.
-                    javaScriptEnabled = true;
-                } else if (domainSettingsApplied) {  // Night mode is disabled and domain settings are applied.  Set JavaScript according to the domain settings.
-                    // Get the JavaScript preference that was stored the last time domain settings were loaded.
-                    javaScriptEnabled = domainSettingsJavaScriptEnabled;
-                } else {  // Night mode is disabled and domain settings are not applied.  Set JavaScript according to the global preference.
-                    // Get a handle for the shared preference.
-                    SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
+                // Set the user agent.
+                if (userAgentName.equals(getString(R.string.system_default_user_agent))) {  // Use the system default user agent.
+                    // Get the array position of the default user agent name.
+                    int defaultUserAgentArrayPosition = userAgentNamesArray.getPosition(defaultUserAgentName);
+
+                    // Set the user agent according to the system default.
+                    switch (defaultUserAgentArrayPosition) {
+                        case UNRECOGNIZED_USER_AGENT:  // The default user agent name is not on the canonical list.
+                            // This is probably because it was set in an older version of Privacy Browser before the switch to persistent user agent names.
+                            nestedScrollWebView.getSettings().setUserAgentString(defaultUserAgentName);
+                            break;
+
+                        case SETTINGS_WEBVIEW_DEFAULT_USER_AGENT:
+                            // Set the user agent to `""`, which uses the default value.
+                            nestedScrollWebView.getSettings().setUserAgentString("");
+                            break;
 
-                    // Get the JavaScript preference.
-                    javaScriptEnabled = sharedPreferences.getBoolean("javascript", false);
+                        case SETTINGS_CUSTOM_USER_AGENT:
+                            // Set the default custom user agent.
+                            nestedScrollWebView.getSettings().setUserAgentString(sharedPreferences.getString("custom_user_agent", getString(R.string.custom_user_agent_default_value)));
+                            break;
+
+                        default:
+                            // Get the user agent string from the user agent data array
+                            nestedScrollWebView.getSettings().setUserAgentString(userAgentDataArray[defaultUserAgentArrayPosition]);
+                    }
+                } else {  // Set the user agent according to the stored name.
+                    // Get the array position of the user agent name.
+                    int userAgentArrayPosition = userAgentNamesArray.getPosition(userAgentName);
+
+                    switch (userAgentArrayPosition) {
+                        case UNRECOGNIZED_USER_AGENT:  // The user agent name contains a custom user agent.
+                            nestedScrollWebView.getSettings().setUserAgentString(userAgentName);
+                            break;
+
+                        case SETTINGS_WEBVIEW_DEFAULT_USER_AGENT:
+                            // Set the user agent to `""`, which uses the default value.
+                            nestedScrollWebView.getSettings().setUserAgentString("");
+                            break;
+
+                        default:
+                            // Get the user agent string from the user agent data array.
+                            nestedScrollWebView.getSettings().setUserAgentString(userAgentDataArray[userAgentArrayPosition]);
+                    }
                 }
 
-                // Apply the JavaScript setting to the WebView.
-                mainWebView.getSettings().setJavaScriptEnabled(javaScriptEnabled);
+                // Set swipe to refresh.
+                switch (swipeToRefreshInt) {
+                    case DomainsDatabaseHelper.SYSTEM_DEFAULT:
+                        // Store the swipe to refresh status in the nested scroll WebView.
+                        nestedScrollWebView.setSwipeToRefresh(defaultSwipeToRefresh);
 
-                // Update the privacy icons.
-                updatePrivacyIcons(false);
+                        // Apply swipe to refresh according to the default.  This can be removed once the minimum API >= 23 because it is continuously set by an on scroll change listener.
+                        swipeRefreshLayout.setEnabled(defaultSwipeToRefresh);
+                        break;
 
-                // Reload the website.
-                mainWebView.reload();
-                return true;
+                    case DomainsDatabaseHelper.ENABLED:
+                        // Store the swipe to refresh status in the nested scroll WebView.
+                        nestedScrollWebView.setSwipeToRefresh(true);
 
-            case R.id.find_on_page:
-                // Hide the URL app bar.
-                supportAppBar.setVisibility(View.GONE);
+                        // Enable swipe to refresh.  This can be removed once the minimum API >= 23 because it is continuously set by an on scroll change listener.
+                        swipeRefreshLayout.setEnabled(true);
+                        break;
 
-                // Show the Find on Page `RelativeLayout`.
-                findOnPageLinearLayout.setVisibility(View.VISIBLE);
+                    case DomainsDatabaseHelper.DISABLED:
+                        // Store the swipe to refresh status in the nested scroll WebView.
+                        nestedScrollWebView.setSwipeToRefresh(false);
 
-                // Display the keyboard.  We have to wait 200 ms before running the command to work around a bug in Android.
-                // http://stackoverflow.com/questions/5520085/android-show-softkeyboard-with-showsoftinput-is-not-working
-                findOnPageEditText.postDelayed(() -> {
-                    // Set the focus on `findOnPageEditText`.
-                    findOnPageEditText.requestFocus();
+                        // Disable swipe to refresh.  This can be removed once the minimum API >= 23 because it is continuously set by an on scroll change listener.
+                        swipeRefreshLayout.setEnabled(false);
+                }
 
-                    // Display the keyboard.  `0` sets no input flags.
-                    inputMethodManager.showSoftInput(findOnPageEditText, 0);
-                }, 200);
-                return true;
+                // Set the viewport.
+                switch (wideViewportInt) {
+                    case DomainsDatabaseHelper.SYSTEM_DEFAULT:
+                        nestedScrollWebView.getSettings().setUseWideViewPort(wideViewport);
+                        break;
 
-            case R.id.view_source:
-                // Launch the View Source activity.
-                Intent viewSourceIntent = new Intent(this, ViewSourceActivity.class);
-                startActivity(viewSourceIntent);
-                return true;
+                    case DomainsDatabaseHelper.ENABLED:
+                        nestedScrollWebView.getSettings().setUseWideViewPort(true);
+                        break;
 
-            case R.id.share_url:
-                // Setup the share string.
-                String shareString = webViewTitle + " – " + urlTextBox.getText().toString();
+                    case DomainsDatabaseHelper.DISABLED:
+                        nestedScrollWebView.getSettings().setUseWideViewPort(false);
+                        break;
+                }
 
-                // Create the share intent.
-                Intent shareIntent = new Intent(Intent.ACTION_SEND);
-                shareIntent.putExtra(Intent.EXTRA_TEXT, shareString);
-                shareIntent.setType("text/plain");
+                // Set the loading of webpage images.
+                switch (displayWebpageImagesInt) {
+                    case DomainsDatabaseHelper.SYSTEM_DEFAULT:
+                        nestedScrollWebView.getSettings().setLoadsImagesAutomatically(displayWebpageImages);
+                        break;
 
-                // Make it so.
-                startActivity(Intent.createChooser(shareIntent, getString(R.string.share_url)));
-                return true;
+                    case DomainsDatabaseHelper.ENABLED:
+                        nestedScrollWebView.getSettings().setLoadsImagesAutomatically(true);
+                        break;
 
-            case R.id.print:
-                // Get a `PrintManager` instance.
-                PrintManager printManager = (PrintManager) getSystemService(Context.PRINT_SERVICE);
+                    case DomainsDatabaseHelper.DISABLED:
+                        nestedScrollWebView.getSettings().setLoadsImagesAutomatically(false);
+                        break;
+                }
 
-                // Convert `mainWebView` to `printDocumentAdapter`.
-                PrintDocumentAdapter printDocumentAdapter = mainWebView.createPrintDocumentAdapter();
+                // Set a green background on the URL relative layout to indicate that custom domain settings are being used. The deprecated `.getDrawable()` must be used until the minimum API >= 21.
+                if (darkTheme) {
+                    urlRelativeLayout.setBackground(getResources().getDrawable(R.drawable.url_bar_background_dark_blue));
+                } else {
+                    urlRelativeLayout.setBackground(getResources().getDrawable(R.drawable.url_bar_background_light_green));
+                }
+            } else {  // The new URL does not have custom domain settings.  Load the defaults.
+                // Store the values from the shared preferences.
+                boolean defaultJavaScriptEnabled = sharedPreferences.getBoolean("javascript", false);
+                nestedScrollWebView.setAcceptFirstPartyCookies(sharedPreferences.getBoolean("first_party_cookies", false));
+                boolean defaultThirdPartyCookiesEnabled = sharedPreferences.getBoolean("third_party_cookies", false);
+                nestedScrollWebView.getSettings().setDomStorageEnabled(sharedPreferences.getBoolean("dom_storage", false));
+                boolean saveFormData = sharedPreferences.getBoolean("save_form_data", false);  // Form data can be removed once the minimum API >= 26.
+                nestedScrollWebView.enableBlocklist(NestedScrollWebView.EASY_LIST, sharedPreferences.getBoolean("easylist", true));
+                nestedScrollWebView.enableBlocklist(NestedScrollWebView.EASY_PRIVACY, sharedPreferences.getBoolean("easyprivacy", true));
+                nestedScrollWebView.enableBlocklist(NestedScrollWebView.FANBOYS_ANNOYANCE_LIST, sharedPreferences.getBoolean("fanboys_annoyance_list", true));
+                nestedScrollWebView.enableBlocklist(NestedScrollWebView.FANBOYS_SOCIAL_BLOCKING_LIST, sharedPreferences.getBoolean("fanboys_social_blocking_list", true));
+                nestedScrollWebView.enableBlocklist(NestedScrollWebView.ULTRA_PRIVACY, sharedPreferences.getBoolean("ultraprivacy", true));
+                nestedScrollWebView.enableBlocklist(NestedScrollWebView.THIRD_PARTY_REQUESTS, sharedPreferences.getBoolean("block_all_third_party_requests", false));
+                nestedScrollWebView.setNightMode(sharedPreferences.getBoolean("night_mode", false));
 
-                // Remove the lint error below that `printManager` might be `null`.
-                assert printManager != null;
+                // Enable JavaScript if night mode is enabled.
+                if (nestedScrollWebView.getNightMode()) {
+                    // Enable JavaScript.
+                    nestedScrollWebView.getSettings().setJavaScriptEnabled(true);
+                } else {
+                    // Set JavaScript according to the domain settings.
+                    nestedScrollWebView.getSettings().setJavaScriptEnabled(defaultJavaScriptEnabled);
+                }
 
-                // Print the document.  The print attributes are `null`.
-                printManager.print(getString(R.string.privacy_browser_web_page), printDocumentAdapter, null);
-                return true;
+                // Apply the default settings.
+                cookieManager.setAcceptCookie(nestedScrollWebView.getAcceptFirstPartyCookies());
+                nestedScrollWebView.getSettings().setTextZoom(Integer.valueOf(defaultFontSizeString));
 
-            case R.id.open_with_app:
-                // Create the open with intent with `ACTION_VIEW`.
-                Intent openWithAppIntent = new Intent(Intent.ACTION_VIEW);
+                // Apply the form data setting if the API < 26.
+                if (Build.VERSION.SDK_INT < 26) {
+                    nestedScrollWebView.getSettings().setSaveFormData(saveFormData);
+                }
+
+                // Store the swipe to refresh status in the nested scroll WebView.
+                nestedScrollWebView.setSwipeToRefresh(defaultSwipeToRefresh);
 
-                // Set the URI but not the MIME type.  This should open all available apps.
-                openWithAppIntent.setData(Uri.parse(formattedUrlString));
+                // Apply swipe to refresh according to the default.
+                swipeRefreshLayout.setEnabled(defaultSwipeToRefresh);
 
-                // Flag the intent to open in a new task.
-                openWithAppIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+                // Reset the pinned variables.
+                nestedScrollWebView.setDomainSettingsDatabaseId(-1);
 
-                // Show the chooser.
-                startActivity(Intent.createChooser(openWithAppIntent, getString(R.string.open_with)));
-                return true;
+                // Set third-party cookies status if API >= 21.
+                if (Build.VERSION.SDK_INT >= 21) {
+                    cookieManager.setAcceptThirdPartyCookies(nestedScrollWebView, defaultThirdPartyCookiesEnabled);
+                }
 
-            case R.id.open_with_browser:
-                // Create the open with intent with `ACTION_VIEW`.
-                Intent openWithBrowserIntent = new Intent(Intent.ACTION_VIEW);
+                // Get the array position of the user agent name.
+                int userAgentArrayPosition = userAgentNamesArray.getPosition(defaultUserAgentName);
 
-                // Set the URI and the MIME type.  `"text/html"` should load browser options.
-                openWithBrowserIntent.setDataAndType(Uri.parse(formattedUrlString), "text/html");
+                // Set the user agent.
+                switch (userAgentArrayPosition) {
+                    case UNRECOGNIZED_USER_AGENT:  // The default user agent name is not on the canonical list.
+                        // This is probably because it was set in an older version of Privacy Browser before the switch to persistent user agent names.
+                        nestedScrollWebView.getSettings().setUserAgentString(defaultUserAgentName);
+                        break;
 
-                // Flag the intent to open in a new task.
-                openWithBrowserIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+                    case SETTINGS_WEBVIEW_DEFAULT_USER_AGENT:
+                        // Set the user agent to `""`, which uses the default value.
+                        nestedScrollWebView.getSettings().setUserAgentString("");
+                        break;
 
-                // Show the chooser.
-                startActivity(Intent.createChooser(openWithBrowserIntent, getString(R.string.open_with)));
-                return true;
+                    case SETTINGS_CUSTOM_USER_AGENT:
+                        // Set the default custom user agent.
+                        nestedScrollWebView.getSettings().setUserAgentString(sharedPreferences.getString("custom_user_agent", getString(R.string.custom_user_agent_default_value)));
+                        break;
 
-            case R.id.add_to_homescreen:
-                // Show the alert dialog.
-                AppCompatDialogFragment createHomeScreenShortcutDialogFragment = new CreateHomeScreenShortcutDialog();
-                createHomeScreenShortcutDialogFragment.show(getSupportFragmentManager(), getString(R.string.create_shortcut));
+                    default:
+                        // Get the user agent string from the user agent data array
+                        nestedScrollWebView.getSettings().setUserAgentString(userAgentDataArray[userAgentArrayPosition]);
+                }
 
-                //Everything else will be handled by the alert dialog and the associated listener below.
-                return true;
+                // Set the viewport.
+                nestedScrollWebView.getSettings().setUseWideViewPort(wideViewport);
 
-            case R.id.proxy_through_orbot:
-                // Toggle the proxy through Orbot variable.
-                proxyThroughOrbot = !proxyThroughOrbot;
+                // Set the loading of webpage images.
+                nestedScrollWebView.getSettings().setLoadsImagesAutomatically(displayWebpageImages);
 
-                // Apply the proxy through Orbot settings.
-                applyProxyThroughOrbot(true);
-                return true;
+                // Set a transparent background on URL edit text.  The deprecated `getResources().getDrawable()` must be used until the minimum API >= 21.
+                urlRelativeLayout.setBackground(getResources().getDrawable(R.color.transparent));
+            }
 
-            case R.id.refresh:
-                if (menuItem.getTitle().equals(getString(R.string.refresh))) {  // The refresh button was pushed.
-                    // Reload the WebView.
-                    mainWebView.reload();
-                } else {  // The stop button was pushed.
-                    // Stop the loading of the WebView.
-                    mainWebView.stopLoading();
-                }
-                return true;
+            // Close the domains database helper.
+            domainsDatabaseHelper.close();
 
-            case R.id.ad_consent:
-                // Display the ad consent dialog.
-                DialogFragment adConsentDialogFragment = new AdConsentDialog();
-                adConsentDialogFragment.show(getFragmentManager(), getString(R.string.ad_consent));
-                return true;
+            // Update the privacy icons.
+            updatePrivacyIcons(true);
+        }
 
-            default:
-                // Don't consume the event.
-                return super.onOptionsItemSelected(menuItem);
+        // Reload the website if returning from the Domains activity.
+        if (reloadWebsite) {
+            nestedScrollWebView.reload();
         }
+
+        // Return the user agent changed status.
+        return !nestedScrollWebView.getSettings().getUserAgentString().equals(initialUserAgent);
     }
 
-    // removeAllCookies is deprecated, but it is required for API < 21.
-    @SuppressWarnings("deprecation")
-    @Override
-    public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
-        int menuItemId = menuItem.getItemId();
+    private void applyProxyThroughOrbot(boolean reloadWebsite) {
+        // Get a handle for the shared preferences.
+        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
 
-        switch (menuItemId) {
-            case R.id.home:
-                loadUrl(homepage);
-                break;
+        // Get the search and theme preferences.
+        String torSearchString = sharedPreferences.getString("tor_search", getString(R.string.tor_search_default_value));
+        String torSearchCustomUrlString = sharedPreferences.getString("tor_search_custom_url", getString(R.string.tor_search_custom_url_default_value));
+        String searchString = sharedPreferences.getString("search", getString(R.string.search_default_value));
+        String searchCustomUrlString = sharedPreferences.getString("search_custom_url", getString(R.string.search_custom_url_default_value));
+        boolean darkTheme = sharedPreferences.getBoolean("dark_theme", false);
 
-            case R.id.back:
-                if (mainWebView.canGoBack()) {
-                    // Reset the formatted URL string so the page will load correctly if blocking of third-party requests is enabled.
-                    formattedUrlString = "";
+        // Get a handle for the app bar layout.
+        AppBarLayout appBarLayout = findViewById(R.id.appbar_layout);
 
-                    // Set `navigatingHistory` so that the domain settings are applied when the new URL is loaded.
-                    navigatingHistory = true;
+        // Set the homepage, search, and proxy options.
+        if (proxyThroughOrbot) {  // Set the Tor options.
+            // Set the search URL.
+            if (torSearchString.equals("Custom URL")) {  // Get the custom URL string.
+                searchURL = torSearchCustomUrlString;
+            } else {  // Use the string from the pre-built list.
+                searchURL = torSearchString;
+            }
 
-                    // Load the previous website in the history.
-                    mainWebView.goBack();
-                }
-                break;
+            // Set the proxy.  `this` refers to the current activity where an `AlertDialog` might be displayed.
+            OrbotProxyHelper.setProxy(getApplicationContext(), this, "localhost", "8118");
 
-            case R.id.forward:
-                if (mainWebView.canGoForward()) {
-                    // Reset the formatted URL string so the page will load correctly if blocking of third-party requests is enabled.
-                    formattedUrlString = "";
+            // Set the app bar background to indicate proxying through Orbot is enabled.
+            if (darkTheme) {
+                appBarLayout.setBackgroundResource(R.color.dark_blue_30);
+            } else {
+                appBarLayout.setBackgroundResource(R.color.blue_50);
+            }
 
-                    // Set `navigatingHistory` so that the domain settings are applied when the new URL is loaded.
-                    navigatingHistory = true;
+            // Check to see if Orbot is ready.
+            if (!orbotStatus.equals("ON")) {  // Orbot is not ready.
+                // Set `waitingForOrbot`.
+                waitingForOrbot = true;
 
-                    // Load the next website in the history.
-                    mainWebView.goForward();
-                }
-                break;
+                // Disable the wide view port so that the waiting for Orbot text is displayed correctly.
+                currentWebView.getSettings().setUseWideViewPort(false);
 
-            case R.id.history:
-                // Get the `WebBackForwardList`.
-                WebBackForwardList webBackForwardList = mainWebView.copyBackForwardList();
+                // Load a waiting page.  `null` specifies no encoding, which defaults to ASCII.
+                currentWebView.loadData("<html><body><br/><center><h1>" + getString(R.string.waiting_for_orbot) + "</h1></center></body></html>", "text/html", null);
+            } else if (reloadWebsite) {  // Orbot is ready and the website should be reloaded.
+                // Reload the website.
+                currentWebView.reload();
+            }
+        } else {  // Set the non-Tor options.
+            // Set the search URL.
+            if (searchString.equals("Custom URL")) {  // Get the custom URL string.
+                searchURL = searchCustomUrlString;
+            } else {  // Use the string from the pre-built list.
+                searchURL = searchString;
+            }
 
-                // Show the `UrlHistoryDialog` `AlertDialog` and name this instance `R.string.history`.  `this` is the `Context`.
-                AppCompatDialogFragment urlHistoryDialogFragment = UrlHistoryDialog.loadBackForwardList(this, webBackForwardList);
-                urlHistoryDialogFragment.show(getSupportFragmentManager(), getString(R.string.history));
-                break;
+            // Reset the proxy to default.  The host is `""` and the port is `"0"`.
+            OrbotProxyHelper.setProxy(getApplicationContext(), this, "", "0");
 
-            case R.id.requests:
-                // Launch the requests activity.
-                Intent requestsIntent = new Intent(this, RequestsActivity.class);
-                startActivity(requestsIntent);
-                break;
+            // Set the default app bar layout background.
+            if (darkTheme) {
+                appBarLayout.setBackgroundResource(R.color.gray_900);
+            } else {
+                appBarLayout.setBackgroundResource(R.color.gray_100);
+            }
 
-            case R.id.downloads:
-                // Launch the system Download Manager.
-                Intent downloadManagerIntent = new Intent(DownloadManager.ACTION_VIEW_DOWNLOADS);
+            // Reset `waitingForOrbot.
+            waitingForOrbot = false;
 
-                // Launch as a new task so that Download Manager and Privacy Browser show as separate windows in the recent tasks list.
-                downloadManagerIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+            // Reload the WebViews if requested.
+            if (reloadWebsite) {
+                // Reload the WebViews.
+                for (int i = 0; i < webViewPagerAdapter.getCount(); i++) {
+                    // Get the WebView tab fragment.
+                    WebViewTabFragment webViewTabFragment = webViewPagerAdapter.getPageFragment(i);
 
-                startActivity(downloadManagerIntent);
-                break;
+                    // Get the fragment view.
+                    View fragmentView = webViewTabFragment.getView();
 
-            case R.id.domains:
-                // Set the flag to reapply the domain settings on restart when returning from Domain Settings.
-                reapplyDomainSettingsOnRestart = true;
-                currentDomainName = "";
+                    // Only reload the WebViews if they exist.
+                    if (fragmentView != null) {
+                        // Get the nested scroll WebView from the tab fragment.
+                        NestedScrollWebView nestedScrollWebView = fragmentView.findViewById(R.id.nestedscroll_webview);
 
-                // Launch the domains activity.
-                Intent domainsIntent = new Intent(this, DomainsActivity.class);
-                startActivity(domainsIntent);
-                break;
+                        // Reload the WebView.
+                        nestedScrollWebView.reload();
+                    }
+                }
+            }
+        }
+    }
 
-            case R.id.settings:
-                // Set the flag to reapply app settings on restart when returning from Settings.
-                reapplyAppSettingsOnRestart = true;
+    private void updatePrivacyIcons(boolean runInvalidateOptionsMenu) {
+        // Only update the privacy icons if the options menu and the current WebView have already been populated.
+        if ((optionsMenu != null) && (currentWebView != null)) {
+            // Get a handle for the shared preferences.
+            SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
 
-                // Set the flag to reapply the domain settings on restart when returning from Settings.
-                reapplyDomainSettingsOnRestart = true;
-                currentDomainName = "";
+            // Get the theme and screenshot preferences.
+            boolean darkTheme = sharedPreferences.getBoolean("dark_theme", false);
+
+            // Get handles for the menu items.
+            MenuItem privacyMenuItem = optionsMenu.findItem(R.id.toggle_javascript);
+            MenuItem firstPartyCookiesMenuItem = optionsMenu.findItem(R.id.toggle_first_party_cookies);
+            MenuItem domStorageMenuItem = optionsMenu.findItem(R.id.toggle_dom_storage);
+            MenuItem refreshMenuItem = optionsMenu.findItem(R.id.refresh);
+
+            // Update the privacy icon.
+            if (currentWebView.getSettings().getJavaScriptEnabled()) {  // JavaScript is enabled.
+                privacyMenuItem.setIcon(R.drawable.javascript_enabled);
+            } else if (currentWebView.getAcceptFirstPartyCookies()) {  // JavaScript is disabled but cookies are enabled.
+                privacyMenuItem.setIcon(R.drawable.warning);
+            } else {  // All the dangerous features are disabled.
+                privacyMenuItem.setIcon(R.drawable.privacy_mode);
+            }
 
-                // Launch the settings activity.
-                Intent settingsIntent = new Intent(this, SettingsActivity.class);
-                startActivity(settingsIntent);
-                break;
+            // Update the first-party cookies icon.
+            if (currentWebView.getAcceptFirstPartyCookies()) {  // First-party cookies are enabled.