Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

141 files changed, 24511 insertions, 0 deletions

diff --git a/browser/components/preferences/tests/addons/pl-dictionary.xpi b/browser/components/preferences/tests/addons/pl-dictionary.xpi
new file mode 100644
index 0000000000..cc4da1fa83
--- /dev/null
+++ b/browser/components/preferences/tests/addons/pl-dictionary.xpi
diff --git a/browser/components/preferences/tests/addons/set_homepage.xpi b/browser/components/preferences/tests/addons/set_homepage.xpi
new file mode 100644
index 0000000000..9aff671021
--- /dev/null
+++ b/browser/components/preferences/tests/addons/set_homepage.xpi
diff --git a/browser/components/preferences/tests/addons/set_newtab.xpi b/browser/components/preferences/tests/addons/set_newtab.xpi
new file mode 100644
index 0000000000..f11db0b6a8
--- /dev/null
+++ b/browser/components/preferences/tests/addons/set_newtab.xpi
diff --git a/browser/components/preferences/tests/browser.toml b/browser/components/preferences/tests/browser.toml
new file mode 100644
index 0000000000..fe523bde94
--- /dev/null
+++ b/browser/components/preferences/tests/browser.toml
@@ -0,0 +1,288 @@
+[DEFAULT]
+prefs = [
+  "extensions.formautofill.addresses.available='on'",
+  "signon.management.page.os-auth.enabled=true",
+]
+support-files = [
+  "head.js",
+  "privacypane_tests_perwindow.js",
+  "addons/pl-dictionary.xpi",
+  "addons/set_homepage.xpi",
+  "addons/set_newtab.xpi",
+]
+
+["browser_advanced_update.js"]
+skip-if = ["!updater"]
+
+["browser_application_xml_handle_internally.js"]
+
+["browser_applications_selection.js"]
+
+["browser_basic_rebuild_fonts_test.js"]
+
+["browser_browser_languages_subdialog.js"]
+skip-if = [
+  "tsan",
+  "!debug && os == 'win'", # Bug 1518370
+]
+
+["browser_bug410900.js"]
+
+["browser_bug731866.js"]
+
+["browser_bug795764_cachedisabled.js"]
+
+["browser_bug1018066_resetScrollPosition.js"]
+
+["browser_bug1020245_openPreferences_to_paneContent.js"]
+
+["browser_bug1184989_prevent_scrolling_when_preferences_flipped.js"]
+skip-if = [
+  "os == 'mac'", # Bug 1664576
+]
+support-files = ["browser_bug1184989_prevent_scrolling_when_preferences_flipped.xhtml"]
+
+["browser_bug1547020_lockedDownloadDir.js"]
+
+["browser_bug1579418.js"]
+
+["browser_cert_export.js"]
+
+["browser_change_app_handler.js"]
+run-if = ["os == 'win'"] # Windows-specific handler application selection dialog
+
+["browser_checkspelling.js"]
+
+["browser_connection.js"]
+
+["browser_connection_bug388287.js"]
+
+["browser_connection_bug1445991.js"]
+
+["browser_connection_bug1505330.js"]
+skip-if = [
+  "verify && debug && os == 'linux'",
+  "verify && debug && os == 'mac'",
+]
+
+["browser_connection_valid_hostname.js"]
+
+["browser_containers_name_input.js"]
+
+["browser_contentblocking.js"]
+skip-if = ["socketprocess_networking"]
+
+["browser_contentblocking_categories.js"]
+
+["browser_contentblocking_standard_tcp_section.js"]
+
+["browser_cookie_exceptions_addRemove.js"]
+
+["browser_cookies_exceptions.js"]
+
+["browser_defaultbrowser_alwayscheck.js"]
+
+["browser_engines.js"]
+fail-if = ["a11y_checks"] # Bug 1854636 clicked treechildren#engineChildren may not be focusable
+
+["browser_ensure_prefs_bindings_initted.js"]
+
+["browser_etp_exceptions_dialog.js"]
+
+["browser_experimental_features.js"]
+
+["browser_experimental_features_filter.js"]
+
+["browser_experimental_features_hidden_when_not_public.js"]
+skip-if = [
+  "os == 'mac' && debug", # Bug 1723854
+  "os == 'linux' && os_version == '18.04' && debug", # Bug 1723854
+]
+
+["browser_experimental_features_resetall.js"]
+
+["browser_extension_controlled.js"]
+skip-if = [
+  "tsan",
+  "ccov && os == 'linux'", # Linux: bug 1613530
+  "ccov && os == 'win'", # Windows: bug 1437051
+]
+
+["browser_filetype_dialog.js"]
+
+["browser_fluent.js"]
+
+["browser_homepage_default.js"]
+
+["browser_homepages_filter_aboutpreferences.js"]
+
+["browser_homepages_use_bookmark.js"]
+
+["browser_hometab_restore_defaults.js"]
+https_first_disabled = true
+
+["browser_https_only_exceptions.js"]
+
+["browser_https_only_section.js"]
+
+["browser_ignore_invalid_capability.js"]
+
+["browser_keyboardfocus.js"]
+skip-if = ["os != 'mac'"]
+
+["browser_languages_subdialog.js"]
+
+["browser_layersacceleration.js"]
+
+["browser_localSearchShortcuts.js"]
+fail-if = ["a11y_checks"] # Bug 1854636 clicked treechildren#engineChildren may not be focusable
+
+["browser_moreFromMozilla.js"]
+
+["browser_moreFromMozilla_locales.js"]
+
+["browser_newtab_menu.js"]
+
+["browser_notifications_do_not_disturb.js"]
+
+["browser_open_download_preferences.js"]
+support-files = ["empty_pdf_file.pdf"]
+
+["browser_open_migration_wizard.js"]
+
+["browser_password_management.js"]
+
+["browser_pdf_disabled.js"]
+
+["browser_performance.js"]
+
+["browser_performance_content_process_limit.js"]
+
+["browser_performance_e10srollout.js"]
+
+["browser_performance_non_e10s.js"]
+skip-if = ["true"]
+
+["browser_permissions_checkPermissionsWereAdded.js"]
+
+["browser_permissions_dialog.js"]
+
+["browser_permissions_dialog_default_perm.js"]
+
+["browser_permissions_urlFieldHidden.js"]
+
+["browser_primaryPassword.js"]
+
+["browser_privacy_cookieBannerHandling.js"]
+
+["browser_privacy_dnsoverhttps.js"]
+
+["browser_privacy_firefoxSuggest.js"]
+
+["browser_privacy_gpc.js"]
+
+["browser_privacy_passwordGenerationAndAutofill.js"]
+
+["browser_privacy_relayIntegration.js"]
+
+["browser_privacy_segmentation_pref.js"]
+
+["browser_privacy_syncDataClearing.js"]
+
+["browser_privacypane_2.js"]
+
+["browser_privacypane_3.js"]
+
+["browser_proxy_backup.js"]
+
+["browser_sanitizeOnShutdown_prefLocked.js"]
+
+["browser_searchChangedEngine.js"]
+
+["browser_searchDefaultEngine.js"]
+support-files = [
+  "engine1/manifest.json",
+  "engine2/manifest.json",
+]
+
+["browser_searchFindMoreLink.js"]
+
+["browser_searchRestoreDefaults.js"]
+
+["browser_searchScroll.js"]
+support-files = ["!/gfx/layers/apz/test/mochitest/apz_test_native_event_utils.js"]
+
+["browser_searchShowSuggestionsFirst.js"]
+
+["browser_search_firefoxSuggest.js"]
+
+["browser_search_no_results_change_category.js"]
+
+["browser_search_quickactions.js"]
+
+["browser_search_searchTerms.js"]
+
+["browser_search_subdialog_tooltip_saved_addresses.js"]
+
+["browser_search_subdialogs_within_preferences_1.js"]
+skip-if = ["tsan"] # Bug 1678829
+
+["browser_search_subdialogs_within_preferences_2.js"]
+
+["browser_search_subdialogs_within_preferences_3.js"]
+
+["browser_search_subdialogs_within_preferences_4.js"]
+
+["browser_search_subdialogs_within_preferences_5.js"]
+
+["browser_search_subdialogs_within_preferences_6.js"]
+
+["browser_search_subdialogs_within_preferences_7.js"]
+
+["browser_search_subdialogs_within_preferences_8.js"]
+
+["browser_search_subdialogs_within_preferences_site_data.js"]
+
+["browser_search_within_preferences_1.js"]
+
+["browser_search_within_preferences_2.js"]
+
+["browser_search_within_preferences_command.js"]
+
+["browser_searchsuggestions.js"]
+
+["browser_security-1.js"]
+
+["browser_security-2.js"]
+
+["browser_security-3.js"]
+
+["browser_site_login_exceptions.js"]
+
+["browser_site_login_exceptions_policy.js"]
+
+["browser_spotlight.js"]
+
+["browser_statePartitioning_PBM_strings.js"]
+
+["browser_statePartitioning_strings.js"]
+
+["browser_subdialogs.js"]
+support-files = [
+  "subdialog.xhtml",
+  "subdialog2.xhtml",
+]
+fail-if = ["a11y_checks"] # Bug 1854636 clicked label.dialogTitle, vbox#dialogTemplate.dialogOverlay may not be focusable
+
+["browser_sync_chooseWhatToSync.js"]
+
+["browser_sync_disabled.js"]
+
+["browser_sync_pairing.js"]
+
+["browser_trendingsuggestions.js"]
+
+["browser_warning_permanent_private_browsing.js"]
+
+["browser_windows_launch_on_login.js"]
+run-if = ["os == 'win'"]
diff --git a/browser/components/preferences/tests/browser_advanced_update.js b/browser/components/preferences/tests/browser_advanced_update.js
new file mode 100644
index 0000000000..0d89607842
--- /dev/null
+++ b/browser/components/preferences/tests/browser_advanced_update.js
@@ -0,0 +1,182 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const Cm = Components.manager;
+
+const uuidGenerator = Services.uuid;
+
+const mockUpdateManager = {
+  contractId: "@mozilla.org/updates/update-manager;1",
+
+  _mockClassId: uuidGenerator.generateUUID(),
+
+  _originalClassId: "",
+
+  QueryInterface: ChromeUtils.generateQI(["nsIUpdateManager"]),
+
+  createInstance(iiD) {
+    return this.QueryInterface(iiD);
+  },
+
+  register() {
+    let registrar = Cm.QueryInterface(Ci.nsIComponentRegistrar);
+    if (!registrar.isCIDRegistered(this._mockClassId)) {
+      this._originalClassId = registrar.contractIDToCID(this.contractId);
+      registrar.registerFactory(
+        this._mockClassId,
+        "Unregister after testing",
+        this.contractId,
+        this
+      );
+    }
+  },
+
+  unregister() {
+    let registrar = Cm.QueryInterface(Ci.nsIComponentRegistrar);
+    registrar.unregisterFactory(this._mockClassId, this);
+    registrar.registerFactory(this._originalClassId, "", this.contractId, null);
+  },
+
+  getUpdateCount() {
+    return this._updates.length;
+  },
+
+  getUpdateAt(index) {
+    return this._updates[index];
+  },
+
+  _updates: [
+    {
+      name: "Firefox Developer Edition 49.0a2",
+      statusText: "The Update was successfully installed",
+      buildID: "20160728004010",
+      installDate: 1469763105156,
+      detailsURL: "https://www.mozilla.org/firefox/aurora/",
+    },
+    {
+      name: "Firefox Developer Edition 43.0a2",
+      statusText: "The Update was successfully installed",
+      buildID: "20150929004011",
+      installDate: 1443585886224,
+      detailsURL: "https://www.mozilla.org/firefox/aurora/",
+    },
+    {
+      name: "Firefox Developer Edition 42.0a2",
+      statusText: "The Update was successfully installed",
+      buildID: "20150920004018",
+      installDate: 1442818147544,
+      detailsURL: "https://www.mozilla.org/firefox/aurora/",
+    },
+  ],
+};
+
+function formatInstallDate(sec) {
+  var date = new Date(sec);
+  const dtOptions = {
+    year: "numeric",
+    month: "long",
+    day: "numeric",
+    hour: "numeric",
+    minute: "numeric",
+    second: "numeric",
+  };
+  return date.toLocaleString(undefined, dtOptions);
+}
+
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("general", { leaveOpen: true });
+  let doc = gBrowser.selectedBrowser.contentDocument;
+
+  let showBtn = doc.getElementById("showUpdateHistory");
+  let dialogOverlay = content.gSubDialog._preloadDialog._overlay;
+
+  // XXX: For unknown reasons, this mock cannot be loaded by
+  // XPCOMUtils.defineLazyServiceGetter() called in aboutDialog-appUpdater.js.
+  // It is registered here so that we could assert update history subdialog
+  // without stopping the preferences advanced pane from loading.
+  // See bug 1361929.
+  mockUpdateManager.register();
+
+  // Test the dialog window opens
+  ok(
+    BrowserTestUtils.isHidden(dialogOverlay),
+    "The dialog should be invisible"
+  );
+  let promiseSubDialogLoaded = promiseLoadSubDialog(
+    "chrome://mozapps/content/update/history.xhtml"
+  );
+  showBtn.doCommand();
+  await promiseSubDialogLoaded;
+  ok(!BrowserTestUtils.isHidden(dialogOverlay), "The dialog should be visible");
+
+  let dialogFrame = dialogOverlay.querySelector(".dialogFrame");
+  let frameDoc = dialogFrame.contentDocument;
+  let updates = frameDoc.querySelectorAll("richlistitem.update");
+
+  // Test the update history numbers are correct
+  is(
+    updates.length,
+    mockUpdateManager.getUpdateCount(),
+    "The update count is incorrect."
+  );
+
+  // Test the updates are displayed correctly
+  let update = null;
+  let updateData = null;
+  for (let i = 0; i < updates.length; ++i) {
+    update = updates[i];
+    updateData = mockUpdateManager.getUpdateAt(i);
+
+    let testcases = [
+      {
+        selector: ".update-name",
+        id: "update-full-build-name",
+        args: { name: updateData.name, buildID: updateData.buildID },
+      },
+      {
+        selector: ".update-installedOn-label",
+        id: "update-installed-on",
+        args: { date: formatInstallDate(updateData.installDate) },
+      },
+      {
+        selector: ".update-status-label",
+        id: "update-status",
+        args: { status: updateData.statusText },
+      },
+    ];
+
+    for (let { selector, id, args } of testcases) {
+      const element = update.querySelector(selector);
+      const l10nAttrs = frameDoc.l10n.getAttributes(element);
+      Assert.deepEqual(
+        l10nAttrs,
+        {
+          id,
+          args,
+        },
+        "Wrong " + id
+      );
+    }
+
+    if (update.detailsURL) {
+      is(
+        update.detailsURL,
+        update.querySelector(".text-link").href,
+        "Wrong detailsURL"
+      );
+    }
+  }
+
+  // Test the dialog window closes
+  let closeBtn = dialogOverlay.querySelector(".dialogClose");
+  closeBtn.doCommand();
+  ok(
+    BrowserTestUtils.isHidden(dialogOverlay),
+    "The dialog should be invisible"
+  );
+
+  mockUpdateManager.unregister();
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_application_xml_handle_internally.js b/browser/components/preferences/tests/browser_application_xml_handle_internally.js
new file mode 100644
index 0000000000..edb4a4c0ec
--- /dev/null
+++ b/browser/components/preferences/tests/browser_application_xml_handle_internally.js
@@ -0,0 +1,49 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const HandlerService = Cc[
+  "@mozilla.org/uriloader/handler-service;1"
+].getService(Ci.nsIHandlerService);
+
+const MIMEService = Cc["@mozilla.org/mime;1"].getService(Ci.nsIMIMEService);
+
+// This test checks that application/xml has the handle internally option.
+add_task(async function applicationXmlHandleInternally() {
+  const mimeInfo = MIMEService.getFromTypeAndExtension(
+    "application/xml",
+    "xml"
+  );
+  HandlerService.store(mimeInfo);
+  registerCleanupFunction(() => {
+    HandlerService.remove(mimeInfo);
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("general", { leaveOpen: true });
+
+  let win = gBrowser.selectedBrowser.contentWindow;
+
+  let container = win.document.getElementById("handlersView");
+
+  // First, find the application/xml item.
+  let xmlItem = container.querySelector("richlistitem[type='application/xml']");
+  Assert.ok(xmlItem, "application/xml is present in handlersView");
+  if (xmlItem) {
+    xmlItem.scrollIntoView({ block: "center" });
+    xmlItem.closest("richlistbox").selectItem(xmlItem);
+
+    // Open its menu
+    let list = xmlItem.querySelector(".actionsMenu");
+    let popup = list.menupopup;
+    let popupShown = BrowserTestUtils.waitForEvent(popup, "popupshown");
+    EventUtils.synthesizeMouseAtCenter(list, {}, win);
+    await popupShown;
+
+    let handleInternallyItem = list.querySelector(
+      `menuitem[action='${Ci.nsIHandlerInfo.handleInternally}']`
+    );
+
+    ok(!!handleInternallyItem, "handle internally is present");
+  }
+
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_applications_selection.js b/browser/components/preferences/tests/browser_applications_selection.js
new file mode 100644
index 0000000000..683ce76a89
--- /dev/null
+++ b/browser/components/preferences/tests/browser_applications_selection.js
@@ -0,0 +1,403 @@
+SimpleTest.requestCompleteLog();
+const { HandlerServiceTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/HandlerServiceTestUtils.sys.mjs"
+);
+
+let gHandlerService = Cc["@mozilla.org/uriloader/handler-service;1"].getService(
+  Ci.nsIHandlerService
+);
+
+let gOldMailHandlers = [];
+let gDummyHandlers = [];
+let gOriginalPreferredMailHandler;
+let gOriginalPreferredPDFHandler;
+
+registerCleanupFunction(function () {
+  function removeDummyHandlers(handlers) {
+    // Remove any of the dummy handlers we created.
+    for (let i = handlers.Count() - 1; i >= 0; i--) {
+      try {
+        if (
+          gDummyHandlers.some(
+            h =>
+              h.uriTemplate ==
+              handlers.queryElementAt(i, Ci.nsIWebHandlerApp).uriTemplate
+          )
+        ) {
+          handlers.removeElementAt(i);
+        }
+      } catch (ex) {
+        /* ignore non-web-app handlers */
+      }
+    }
+  }
+  // Re-add the original protocol handlers:
+  let mailHandlerInfo = HandlerServiceTestUtils.getHandlerInfo("mailto");
+  let mailHandlers = mailHandlerInfo.possibleApplicationHandlers;
+  for (let h of gOldMailHandlers) {
+    mailHandlers.appendElement(h);
+  }
+  removeDummyHandlers(mailHandlers);
+  mailHandlerInfo.preferredApplicationHandler = gOriginalPreferredMailHandler;
+  gHandlerService.store(mailHandlerInfo);
+
+  let pdfHandlerInfo =
+    HandlerServiceTestUtils.getHandlerInfo("application/pdf");
+  removeDummyHandlers(pdfHandlerInfo.possibleApplicationHandlers);
+  pdfHandlerInfo.preferredApplicationHandler = gOriginalPreferredPDFHandler;
+  gHandlerService.store(pdfHandlerInfo);
+
+  gBrowser.removeCurrentTab();
+});
+
+function scrubMailtoHandlers(handlerInfo) {
+  // Remove extant web handlers because they have icons that
+  // we fetch from the web, which isn't allowed in tests.
+  let handlers = handlerInfo.possibleApplicationHandlers;
+  for (let i = handlers.Count() - 1; i >= 0; i--) {
+    try {
+      let handler = handlers.queryElementAt(i, Ci.nsIWebHandlerApp);
+      gOldMailHandlers.push(handler);
+      // If we get here, this is a web handler app. Remove it:
+      handlers.removeElementAt(i);
+    } catch (ex) {}
+  }
+}
+
+add_setup(async function () {
+  // Create our dummy handlers
+  let handler1 = Cc["@mozilla.org/uriloader/web-handler-app;1"].createInstance(
+    Ci.nsIWebHandlerApp
+  );
+  handler1.name = "Handler 1";
+  handler1.uriTemplate = "https://example.com/first/%s";
+
+  let handler2 = Cc["@mozilla.org/uriloader/web-handler-app;1"].createInstance(
+    Ci.nsIWebHandlerApp
+  );
+  handler2.name = "Handler 2";
+  handler2.uriTemplate = "http://example.org/second/%s";
+  gDummyHandlers.push(handler1, handler2);
+
+  function substituteWebHandlers(handlerInfo) {
+    // Append the dummy handlers to replace them:
+    let handlers = handlerInfo.possibleApplicationHandlers;
+    handlers.appendElement(handler1);
+    handlers.appendElement(handler2);
+    gHandlerService.store(handlerInfo);
+  }
+  // Set up our mailto handler test infrastructure.
+  let mailtoHandlerInfo = HandlerServiceTestUtils.getHandlerInfo("mailto");
+  scrubMailtoHandlers(mailtoHandlerInfo);
+  gOriginalPreferredMailHandler = mailtoHandlerInfo.preferredApplicationHandler;
+  substituteWebHandlers(mailtoHandlerInfo);
+
+  // Now do the same for pdf handler:
+  let pdfHandlerInfo =
+    HandlerServiceTestUtils.getHandlerInfo("application/pdf");
+  // PDF doesn't have built-in web handlers, so no need to scrub.
+  gOriginalPreferredPDFHandler = pdfHandlerInfo.preferredApplicationHandler;
+  substituteWebHandlers(pdfHandlerInfo);
+
+  await openPreferencesViaOpenPreferencesAPI("general", { leaveOpen: true });
+  info("Preferences page opened on the general pane.");
+
+  await gBrowser.selectedBrowser.contentWindow.promiseLoadHandlersList;
+  info("Apps list loaded.");
+});
+
+async function selectStandardOptions(itemToUse) {
+  async function selectItemInPopup(item) {
+    let popupShown = BrowserTestUtils.waitForEvent(popup, "popupshown");
+    // Synthesizing the mouse on the .actionsMenu menulist somehow just selects
+    // the top row. Probably something to do with the multiple layers of anon
+    // content - workaround by using the `.open` setter instead.
+    list.open = true;
+    await popupShown;
+    let popupHidden = BrowserTestUtils.waitForEvent(popup, "popuphidden");
+    if (typeof item == "function") {
+      item = item();
+    }
+    popup.activateItem(item);
+    await popupHidden;
+    return item;
+  }
+
+  let itemType = itemToUse.getAttribute("type");
+  // Center the item. Center rather than top so it doesn't get blocked by
+  // the search header.
+  itemToUse.scrollIntoView({ block: "center" });
+  itemToUse.closest("richlistbox").selectItem(itemToUse);
+  Assert.ok(itemToUse.selected, "Should be able to select our item.");
+  // Force reflow to make sure it's visible and the container dropdown isn't
+  // hidden.
+  itemToUse.getBoundingClientRect().top;
+  let list = itemToUse.querySelector(".actionsMenu");
+  let popup = list.menupopup;
+
+  // select one of our test cases:
+  let handlerItem = list.querySelector("menuitem[data-l10n-args*='Handler 1']");
+  await selectItemInPopup(handlerItem);
+  let { preferredAction, alwaysAskBeforeHandling } =
+    HandlerServiceTestUtils.getHandlerInfo(itemType);
+  Assert.notEqual(
+    preferredAction,
+    Ci.nsIHandlerInfo.alwaysAsk,
+    "Should have selected something other than 'always ask' (" + itemType + ")"
+  );
+  Assert.ok(
+    !alwaysAskBeforeHandling,
+    "Should have turned off asking before handling (" + itemType + ")"
+  );
+
+  // Test the alwaysAsk option
+  let alwaysAskItem = list.getElementsByAttribute(
+    "action",
+    Ci.nsIHandlerInfo.alwaysAsk
+  )[0];
+  await selectItemInPopup(alwaysAskItem);
+  Assert.equal(
+    list.selectedItem,
+    alwaysAskItem,
+    "Should have selected always ask item (" + itemType + ")"
+  );
+  alwaysAskBeforeHandling =
+    HandlerServiceTestUtils.getHandlerInfo(itemType).alwaysAskBeforeHandling;
+  Assert.ok(
+    alwaysAskBeforeHandling,
+    "Should have turned on asking before handling (" + itemType + ")"
+  );
+
+  let useDefaultItem = list.getElementsByAttribute(
+    "action",
+    Ci.nsIHandlerInfo.useSystemDefault
+  );
+  useDefaultItem = useDefaultItem && useDefaultItem[0];
+  if (useDefaultItem) {
+    await selectItemInPopup(useDefaultItem);
+    Assert.equal(
+      list.selectedItem,
+      useDefaultItem,
+      "Should have selected 'use default' item (" + itemType + ")"
+    );
+    preferredAction =
+      HandlerServiceTestUtils.getHandlerInfo(itemType).preferredAction;
+    Assert.equal(
+      preferredAction,
+      Ci.nsIHandlerInfo.useSystemDefault,
+      "Should have selected 'use default' (" + itemType + ")"
+    );
+  } else {
+    // Whether there's a "use default" item depends on the OS, so it's not
+    // possible to rely on it being the case or not.
+    info("No 'Use default' item, so not testing (" + itemType + ")");
+  }
+
+  // Select a web app item.
+  let webAppItems = Array.from(
+    popup.getElementsByAttribute("action", Ci.nsIHandlerInfo.useHelperApp)
+  );
+  webAppItems = webAppItems.filter(
+    item => item.handlerApp instanceof Ci.nsIWebHandlerApp
+  );
+  Assert.equal(
+    webAppItems.length,
+    2,
+    "Should have 2 web application handler. (" + itemType + ")"
+  );
+  Assert.notEqual(
+    webAppItems[0].label,
+    webAppItems[1].label,
+    "Should have 2 different web app handlers"
+  );
+  let selectedItem = await selectItemInPopup(webAppItems[0]);
+
+  // Test that the selected item label is the same as the label
+  // of the menu item.
+  let win = gBrowser.selectedBrowser.contentWindow;
+  await win.document.l10n.translateFragment(selectedItem);
+  await win.document.l10n.translateFragment(itemToUse);
+  Assert.equal(
+    selectedItem.label,
+    itemToUse.querySelector(".actionContainer label").value,
+    "Should have selected correct item (" + itemType + ")"
+  );
+  let { preferredApplicationHandler } =
+    HandlerServiceTestUtils.getHandlerInfo(itemType);
+  preferredApplicationHandler.QueryInterface(Ci.nsIWebHandlerApp);
+  Assert.equal(
+    selectedItem.handlerApp.uriTemplate,
+    preferredApplicationHandler.uriTemplate,
+    "App should actually be selected in the backend. (" + itemType + ")"
+  );
+
+  // select the other web app item
+  selectedItem = await selectItemInPopup(webAppItems[1]);
+
+  // Test that the selected item label is the same as the label
+  // of the menu item
+  await win.document.l10n.translateFragment(selectedItem);
+  await win.document.l10n.translateFragment(itemToUse);
+  Assert.equal(
+    selectedItem.label,
+    itemToUse.querySelector(".actionContainer label").value,
+    "Should have selected correct item (" + itemType + ")"
+  );
+  preferredApplicationHandler =
+    HandlerServiceTestUtils.getHandlerInfo(
+      itemType
+    ).preferredApplicationHandler;
+  preferredApplicationHandler.QueryInterface(Ci.nsIWebHandlerApp);
+  Assert.equal(
+    selectedItem.handlerApp.uriTemplate,
+    preferredApplicationHandler.uriTemplate,
+    "App should actually be selected in the backend. (" + itemType + ")"
+  );
+}
+
+add_task(async function checkDropdownBehavior() {
+  let win = gBrowser.selectedBrowser.contentWindow;
+
+  let container = win.document.getElementById("handlersView");
+
+  // First check a protocol handler item.
+  let mailItem = container.querySelector("richlistitem[type='mailto']");
+  Assert.ok(mailItem, "mailItem is present in handlersView.");
+  await selectStandardOptions(mailItem);
+
+  // Then check a content menu item.
+  let pdfItem = container.querySelector("richlistitem[type='application/pdf']");
+  Assert.ok(pdfItem, "pdfItem is present in handlersView.");
+  await selectStandardOptions(pdfItem);
+});
+
+add_task(async function sortingCheck() {
+  let win = gBrowser.selectedBrowser.contentWindow;
+  const handlerView = win.document.getElementById("handlersView");
+  const typeColumn = win.document.getElementById("typeColumn");
+  Assert.ok(typeColumn, "typeColumn is present in handlersView.");
+
+  let expectedNumberOfItems =
+    handlerView.querySelectorAll("richlistitem").length;
+
+  // Test default sorting
+  assertSortByType("ascending");
+
+  const oldDir = typeColumn.getAttribute("sortDirection");
+
+  // click on an item and sort again:
+  let itemToUse = handlerView.querySelector("richlistitem[type=mailto]");
+  itemToUse.scrollIntoView({ block: "center" });
+  itemToUse.closest("richlistbox").selectItem(itemToUse);
+
+  // Test sorting on the type column
+  typeColumn.click();
+  assertSortByType("descending");
+  Assert.notEqual(
+    oldDir,
+    typeColumn.getAttribute("sortDirection"),
+    "Sort direction should change"
+  );
+
+  typeColumn.click();
+  assertSortByType("ascending");
+
+  const actionColumn = win.document.getElementById("actionColumn");
+  Assert.ok(actionColumn, "actionColumn is present in handlersView.");
+
+  // Test sorting on the action column
+  const oldActionDir = actionColumn.getAttribute("sortDirection");
+  actionColumn.click();
+  assertSortByAction("ascending");
+  Assert.notEqual(
+    oldActionDir,
+    actionColumn.getAttribute("sortDirection"),
+    "Sort direction should change"
+  );
+
+  actionColumn.click();
+  assertSortByAction("descending");
+
+  // Restore the default sort order
+  typeColumn.click();
+  assertSortByType("ascending");
+
+  function assertSortByAction(order) {
+    Assert.equal(
+      actionColumn.getAttribute("sortDirection"),
+      order,
+      `Sort direction should be ${order}`
+    );
+    let siteItems = handlerView.getElementsByTagName("richlistitem");
+    Assert.equal(
+      siteItems.length,
+      expectedNumberOfItems,
+      "Number of items should not change."
+    );
+    for (let i = 0; i < siteItems.length - 1; ++i) {
+      let aType = siteItems[i].getAttribute("actionDescription").toLowerCase();
+      let bType = siteItems[i + 1]
+        .getAttribute("actionDescription")
+        .toLowerCase();
+      let result = 0;
+      if (aType > bType) {
+        result = 1;
+      } else if (bType > aType) {
+        result = -1;
+      }
+      if (order == "ascending") {
+        Assert.lessOrEqual(
+          result,
+          0,
+          "Should sort applications in the ascending order by action"
+        );
+      } else {
+        Assert.greaterOrEqual(
+          result,
+          0,
+          "Should sort applications in the descending order by action"
+        );
+      }
+    }
+  }
+
+  function assertSortByType(order) {
+    Assert.equal(
+      typeColumn.getAttribute("sortDirection"),
+      order,
+      `Sort direction should be ${order}`
+    );
+
+    let siteItems = handlerView.getElementsByTagName("richlistitem");
+    Assert.equal(
+      siteItems.length,
+      expectedNumberOfItems,
+      "Number of items should not change."
+    );
+    for (let i = 0; i < siteItems.length - 1; ++i) {
+      let aType = siteItems[i].getAttribute("typeDescription").toLowerCase();
+      let bType = siteItems[i + 1]
+        .getAttribute("typeDescription")
+        .toLowerCase();
+      let result = 0;
+      if (aType > bType) {
+        result = 1;
+      } else if (bType > aType) {
+        result = -1;
+      }
+      if (order == "ascending") {
+        Assert.lessOrEqual(
+          result,
+          0,
+          "Should sort applications in the ascending order by type"
+        );
+      } else {
+        Assert.greaterOrEqual(
+          result,
+          0,
+          "Should sort applications in the descending order by type"
+        );
+      }
+    }
+  }
+});
diff --git a/browser/components/preferences/tests/browser_basic_rebuild_fonts_test.js b/browser/components/preferences/tests/browser_basic_rebuild_fonts_test.js
new file mode 100644
index 0000000000..51998db5a9
--- /dev/null
+++ b/browser/components/preferences/tests/browser_basic_rebuild_fonts_test.js
@@ -0,0 +1,235 @@
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("general", { leaveOpen: true });
+  await gBrowser.contentWindow.gMainPane._selectDefaultLanguageGroupPromise;
+  await TestUtils.waitForCondition(
+    () => !gBrowser.contentWindow.Preferences.updateQueued
+  );
+
+  let doc = gBrowser.contentDocument;
+  let contentWindow = gBrowser.contentWindow;
+  var langGroup = Services.prefs.getComplexValue(
+    "font.language.group",
+    Ci.nsIPrefLocalizedString
+  ).data;
+  is(
+    contentWindow.Preferences.get("font.language.group").value,
+    langGroup,
+    "Language group should be set correctly."
+  );
+
+  let defaultFontType = Services.prefs.getCharPref("font.default." + langGroup);
+  let fontFamilyPref = "font.name." + defaultFontType + "." + langGroup;
+  let fontFamily = Services.prefs.getCharPref(fontFamilyPref);
+  let fontFamilyField = doc.getElementById("defaultFont");
+  is(fontFamilyField.value, fontFamily, "Font family should be set correctly.");
+
+  function dispatchMenuItemCommand(menuItem) {
+    const cmdEvent = doc.createEvent("xulcommandevent");
+    cmdEvent.initCommandEvent(
+      "command",
+      true,
+      true,
+      contentWindow,
+      0,
+      false,
+      false,
+      false,
+      false,
+      0,
+      null,
+      0
+    );
+    menuItem.dispatchEvent(cmdEvent);
+  }
+
+  /**
+   * Return a promise that resolves when the fontFamilyPref changes.
+   *
+   * Font prefs are the only ones whose form controls set "delayprefsave",
+   * which delays the pref change when a user specifies a new value
+   * for the pref.  Thus, in order to confirm that the pref gets changed
+   * when the test selects a new value in a font field, we need to await
+   * the change.  Awaiting this function does so for fontFamilyPref.
+   */
+  function fontFamilyPrefChanged() {
+    return new Promise(resolve => {
+      const observer = {
+        observe(aSubject, aTopic, aData) {
+          // Check for an exact match to avoid the ambiguity of nsIPrefBranch's
+          // prefix-matching algorithm for notifying pref observers.
+          if (aData == fontFamilyPref) {
+            Services.prefs.removeObserver(fontFamilyPref, observer);
+            resolve();
+          }
+        },
+      };
+      Services.prefs.addObserver(fontFamilyPref, observer);
+    });
+  }
+
+  const menuItems = fontFamilyField.querySelectorAll("menuitem");
+  Assert.greater(menuItems.length, 1, "There are multiple font menuitems.");
+  ok(menuItems[0].selected, "The first (default) font menuitem is selected.");
+
+  dispatchMenuItemCommand(menuItems[1]);
+  ok(menuItems[1].selected, "The second font menuitem is selected.");
+
+  await fontFamilyPrefChanged();
+  fontFamily = Services.prefs.getCharPref(fontFamilyPref);
+  is(fontFamilyField.value, fontFamily, "The font family has been updated.");
+
+  dispatchMenuItemCommand(menuItems[0]);
+  ok(
+    menuItems[0].selected,
+    "The first (default) font menuitem is selected again."
+  );
+
+  await fontFamilyPrefChanged();
+  fontFamily = Services.prefs.getCharPref(fontFamilyPref);
+  is(fontFamilyField.value, fontFamily, "The font family has been updated.");
+
+  let defaultFontSize = Services.prefs.getIntPref(
+    "font.size.variable." + langGroup
+  );
+  let fontSizeField = doc.getElementById("defaultFontSize");
+  is(
+    fontSizeField.value,
+    "" + defaultFontSize,
+    "Font size should be set correctly."
+  );
+
+  let promiseSubDialogLoaded = promiseLoadSubDialog(
+    "chrome://browser/content/preferences/dialogs/fonts.xhtml"
+  );
+  doc.getElementById("advancedFonts").click();
+  let win = await promiseSubDialogLoaded;
+  doc = win.document;
+
+  // Simulate a dumb font backend.
+  win.FontBuilder._enumerator = {
+    _list: ["MockedFont1", "MockedFont2", "MockedFont3"],
+    _defaultFont: null,
+    EnumerateFontsAsync(lang, type) {
+      return Promise.resolve(this._list);
+    },
+    EnumerateAllFontsAsync() {
+      return Promise.resolve(this._list);
+    },
+    getDefaultFont() {
+      return this._defaultFont;
+    },
+    getStandardFamilyName(name) {
+      return name;
+    },
+  };
+  win.FontBuilder._allFonts = null;
+  win.FontBuilder._langGroupSupported = false;
+
+  let langGroupElement = win.Preferences.get("font.language.group");
+  let selectLangsField = doc.getElementById("selectLangs");
+  let serifField = doc.getElementById("serif");
+  let armenian = "x-armn";
+  let western = "x-western";
+
+  // Await rebuilding of the font lists, which happens asynchronously in
+  // gFontsDialog._selectLanguageGroup.  Testing code needs to call this
+  // function and await its resolution after changing langGroupElement's value
+  // (or doing anything else that triggers a call to _selectLanguageGroup).
+  function fontListsRebuilt() {
+    return win.gFontsDialog._selectLanguageGroupPromise;
+  }
+
+  langGroupElement.value = armenian;
+  await fontListsRebuilt();
+  selectLangsField.value = armenian;
+  is(serifField.value, "", "Font family should not be set.");
+
+  let armenianSerifElement = win.Preferences.get("font.name.serif.x-armn");
+
+  langGroupElement.value = western;
+  await fontListsRebuilt();
+  selectLangsField.value = western;
+
+  // Simulate a font backend supporting language-specific enumeration.
+  // NB: FontBuilder has cached the return value from EnumerateAllFonts(),
+  // so _allFonts will always have 3 elements regardless of subsequent
+  // _list changes.
+  win.FontBuilder._enumerator._list = ["MockedFont2"];
+
+  langGroupElement.value = armenian;
+  await fontListsRebuilt();
+  selectLangsField.value = armenian;
+  is(
+    serifField.value,
+    "",
+    "Font family should still be empty for indicating using 'default' font."
+  );
+
+  langGroupElement.value = western;
+  await fontListsRebuilt();
+  selectLangsField.value = western;
+
+  // Simulate a system that has no fonts for the specified language.
+  win.FontBuilder._enumerator._list = [];
+
+  langGroupElement.value = armenian;
+  await fontListsRebuilt();
+  selectLangsField.value = armenian;
+  is(serifField.value, "", "Font family should not be set.");
+
+  // Setting default font to "MockedFont3".  Then, when serifField.value is
+  // empty, it should indicate using "MockedFont3" but it shouldn't be saved
+  // to "MockedFont3" in the pref.  It should be resolved at runtime.
+  win.FontBuilder._enumerator._list = [
+    "MockedFont1",
+    "MockedFont2",
+    "MockedFont3",
+  ];
+  win.FontBuilder._enumerator._defaultFont = "MockedFont3";
+  langGroupElement.value = armenian;
+  await fontListsRebuilt();
+  selectLangsField.value = armenian;
+  is(
+    serifField.value,
+    "",
+    "Font family should be empty even if there is a default font."
+  );
+
+  armenianSerifElement.value = "MockedFont2";
+  serifField.value = "MockedFont2";
+  is(
+    serifField.value,
+    "MockedFont2",
+    'Font family should be "MockedFont2" for now.'
+  );
+
+  langGroupElement.value = western;
+  await fontListsRebuilt();
+  selectLangsField.value = western;
+  is(serifField.value, "", "Font family of other language should not be set.");
+
+  langGroupElement.value = armenian;
+  await fontListsRebuilt();
+  selectLangsField.value = armenian;
+  is(
+    serifField.value,
+    "MockedFont2",
+    "Font family should not be changed even after switching the language."
+  );
+
+  // If MochedFont2 is removed from the system, the value should be treated
+  // as empty (i.e., 'default' font) after rebuilding the font list.
+  win.FontBuilder._enumerator._list = ["MockedFont1", "MockedFont3"];
+  win.FontBuilder._enumerator._allFonts = ["MockedFont1", "MockedFont3"];
+  serifField.removeAllItems(); // This will cause rebuilding the font list from available fonts.
+  langGroupElement.value = armenian;
+  await fontListsRebuilt();
+  selectLangsField.value = armenian;
+  is(
+    serifField.value,
+    "",
+    "Font family should become empty due to the font uninstalled."
+  );
+
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_browser_languages_subdialog.js b/browser/components/preferences/tests/browser_browser_languages_subdialog.js
new file mode 100644
index 0000000000..1941fb3502
--- /dev/null
+++ b/browser/components/preferences/tests/browser_browser_languages_subdialog.js
@@ -0,0 +1,1063 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const { AddonTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/AddonTestUtils.sys.mjs"
+);
+
+AddonTestUtils.initMochitest(this);
+
+const BROWSER_LANGUAGES_URL =
+  "chrome://browser/content/preferences/dialogs/browserLanguages.xhtml";
+const DICTIONARY_ID_PL = "pl@dictionaries.addons.mozilla.org";
+const TELEMETRY_CATEGORY = "intl.ui.browserLanguage";
+
+function langpackId(locale) {
+  return `langpack-${locale}@firefox.mozilla.org`;
+}
+
+function getManifestData(locale, version = "2.0") {
+  return {
+    langpack_id: locale,
+    name: `${locale} Language Pack`,
+    description: `${locale} Language pack`,
+    languages: {
+      [locale]: {
+        chrome_resources: {
+          branding: `browser/chrome/${locale}/locale/branding/`,
+        },
+        version: "1",
+      },
+    },
+    browser_specific_settings: {
+      gecko: {
+        id: langpackId(locale),
+        strict_min_version: AppConstants.MOZ_APP_VERSION,
+        strict_max_version: AppConstants.MOZ_APP_VERSION,
+      },
+    },
+    version,
+    manifest_version: 2,
+    sources: {
+      browser: {
+        base_path: "browser/",
+      },
+    },
+    author: "Mozilla",
+  };
+}
+
+let testLocales = ["fr", "pl", "he"];
+let testLangpacks;
+
+function createLangpack(locale, version) {
+  return AddonTestUtils.createTempXPIFile({
+    "manifest.json": getManifestData(locale, version),
+    [`browser/${locale}/branding/brand.ftl`]: "-brand-short-name = Firefox",
+  });
+}
+
+function createTestLangpacks() {
+  if (!testLangpacks) {
+    testLangpacks = Promise.all(
+      testLocales.map(async locale => [locale, await createLangpack(locale)])
+    );
+  }
+  return testLangpacks;
+}
+
+function createLocaleResult(target_locale, url) {
+  return {
+    guid: langpackId(target_locale),
+    type: "language",
+    target_locale,
+    current_compatible_version: {
+      files: [
+        {
+          platform: "all",
+          url,
+        },
+      ],
+    },
+  };
+}
+
+async function createLanguageToolsFile() {
+  let langpacks = await createTestLangpacks();
+  let results = langpacks.map(([locale, file]) =>
+    createLocaleResult(locale, Services.io.newFileURI(file).spec)
+  );
+
+  let filename = "language-tools.json";
+  let files = { [filename]: { results } };
+  let tempdir = AddonTestUtils.tempDir.clone();
+  let dir = await AddonTestUtils.promiseWriteFilesToDir(tempdir.path, files);
+  dir.append(filename);
+
+  return dir;
+}
+
+async function createDictionaryBrowseResults() {
+  let testDir = gTestPath.substr(0, gTestPath.lastIndexOf("/"));
+  let dictionaryPath = testDir + "/addons/pl-dictionary.xpi";
+  let filename = "dictionaries.json";
+  let response = {
+    page_size: 25,
+    page_count: 1,
+    count: 1,
+    results: [
+      {
+        current_version: {
+          id: 1823648,
+          compatibility: {
+            firefox: { max: "9999", min: "4.0" },
+          },
+          files: [
+            {
+              platform: "all",
+              url: dictionaryPath,
+            },
+          ],
+          version: "1.0.20160228",
+        },
+        default_locale: "pl",
+        description: "Polish spell-check",
+        guid: DICTIONARY_ID_PL,
+        name: "Polish Dictionary",
+        slug: "polish-spellchecker-dictionary",
+        status: "public",
+        summary: "Polish dictionary",
+        type: "dictionary",
+      },
+    ],
+  };
+
+  let files = { [filename]: response };
+  let dir = await AddonTestUtils.promiseWriteFilesToDir(
+    AddonTestUtils.tempDir.path,
+    files
+  );
+  dir.append(filename);
+
+  return dir;
+}
+
+function assertLocaleOrder(list, locales) {
+  is(
+    list.itemCount,
+    locales.split(",").length,
+    "The right number of locales are selected"
+  );
+  is(
+    Array.from(list.children)
+      .map(child => child.value)
+      .join(","),
+    locales,
+    "The selected locales are in order"
+  );
+}
+
+function assertAvailableLocales(list, locales) {
+  let items = Array.from(list.menupopup.children);
+  let listLocales = items.filter(item => item.value && item.value != "search");
+  is(
+    listLocales.length,
+    locales.length,
+    "The right number of locales are available"
+  );
+  is(
+    listLocales
+      .map(item => item.value)
+      .sort()
+      .join(","),
+    locales.sort().join(","),
+    "The available locales match"
+  );
+  is(items[0].getAttribute("class"), "label-item", "The first row is a label");
+}
+
+function getDialogId(dialogDoc) {
+  return dialogDoc.ownerGlobal.arguments[0].telemetryId;
+}
+
+function assertTelemetryRecorded(events) {
+  let snapshot = Services.telemetry.snapshotEvents(
+    Ci.nsITelemetry.DATASET_PRERELEASE_CHANNELS,
+    true
+  );
+
+  // Make sure we got some data.
+  ok(
+    snapshot.parent && !!snapshot.parent.length,
+    "Got parent telemetry events in the snapshot"
+  );
+
+  // Only look at the related events after stripping the timestamp and category.
+  let relatedEvents = snapshot.parent
+    .filter(([timestamp, category]) => category == TELEMETRY_CATEGORY)
+    .map(relatedEvent => relatedEvent.slice(2, 6));
+
+  // Events are now an array of: method, object[, value[, extra]] as expected.
+  Assert.deepEqual(relatedEvents, events, "The events are recorded correctly");
+}
+
+async function selectLocale(localeCode, available, selected, dialogDoc) {
+  let [locale] = Array.from(available.menupopup.children).filter(
+    item => item.value == localeCode
+  );
+  available.selectedItem = locale;
+
+  // Get ready for the selected list to change.
+  let added = waitForMutation(selected, { childList: true }, target =>
+    Array.from(target.children).some(el => el.value == localeCode)
+  );
+
+  // Add the locale.
+  dialogDoc.getElementById("add").doCommand();
+
+  // Wait for the list to update.
+  await added;
+}
+
+async function openDialog(doc, search = false) {
+  let dialogLoaded = promiseLoadSubDialog(BROWSER_LANGUAGES_URL);
+  if (search) {
+    doc.getElementById("primaryBrowserLocaleSearch").doCommand();
+    doc.getElementById("primaryBrowserLocale").menupopup.hidePopup();
+  } else {
+    doc.getElementById("manageBrowserLanguagesButton").doCommand();
+  }
+  let dialogWin = await dialogLoaded;
+  let dialogDoc = dialogWin.document;
+  return {
+    dialog: dialogDoc.getElementById("BrowserLanguagesDialog"),
+    dialogDoc,
+    available: dialogDoc.getElementById("availableLocales"),
+    selected: dialogDoc.getElementById("selectedLocales"),
+  };
+}
+
+add_task(async function testDisabledBrowserLanguages() {
+  let langpacksFile = await createLanguageToolsFile();
+  let langpacksUrl = Services.io.newFileURI(langpacksFile).spec;
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["intl.multilingual.enabled", true],
+      ["intl.multilingual.downloadEnabled", true],
+      ["intl.multilingual.liveReload", false],
+      ["intl.multilingual.liveReloadBidirectional", false],
+      ["intl.locale.requested", "en-US,pl,he,de"],
+      ["extensions.langpacks.signatures.required", false],
+      ["extensions.getAddons.langpacks.url", langpacksUrl],
+    ],
+  });
+
+  // Install an old pl langpack.
+  let oldLangpack = await createLangpack("pl", "1.0");
+  await AddonTestUtils.promiseInstallFile(oldLangpack);
+
+  // Install all the other available langpacks.
+  let pl;
+  let langpacks = await createTestLangpacks();
+  let addons = await Promise.all(
+    langpacks.map(async ([locale, file]) => {
+      if (locale == "pl") {
+        pl = await AddonManager.getAddonByID(langpackId("pl"));
+        // Disable pl so it's removed from selected.
+        await pl.disable();
+        return pl;
+      }
+      let install = await AddonTestUtils.promiseInstallFile(file);
+      return install.addon;
+    })
+  );
+
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+
+  let doc = gBrowser.contentDocument;
+  let { dialogDoc, available, selected } = await openDialog(doc);
+
+  // pl is not selected since it's disabled.
+  is(pl.userDisabled, true, "pl is disabled");
+  is(pl.version, "1.0", "pl is the old 1.0 version");
+  assertLocaleOrder(selected, "en-US,he");
+
+  // Wait for the children menu to be populated.
+  await BrowserTestUtils.waitForCondition(
+    () => !!available.children.length,
+    "Children list populated"
+  );
+
+  // Only fr is enabled and not selected, so it's the only locale available.
+  assertAvailableLocales(available, ["fr"]);
+
+  // Search for more languages.
+  available.menupopup.lastElementChild.doCommand();
+  available.menupopup.hidePopup();
+  await waitForMutation(available.menupopup, { childList: true }, target =>
+    Array.from(available.menupopup.children).some(
+      locale => locale.value == "pl"
+    )
+  );
+
+  // pl is now available since it is available remotely.
+  assertAvailableLocales(available, ["fr", "pl"]);
+
+  let installId = null;
+  AddonTestUtils.promiseInstallEvent("onInstallEnded").then(([install]) => {
+    installId = install.installId;
+  });
+
+  // Add pl.
+  await selectLocale("pl", available, selected, dialogDoc);
+  assertLocaleOrder(selected, "pl,en-US,he");
+
+  // Find pl again since it's been upgraded.
+  pl = await AddonManager.getAddonByID(langpackId("pl"));
+  is(pl.userDisabled, false, "pl is now enabled");
+  is(pl.version, "2.0", "pl is upgraded to version 2.0");
+
+  let dialogId = getDialogId(dialogDoc);
+  ok(dialogId, "There's a dialogId");
+  ok(installId, "There's an installId");
+
+  await Promise.all(addons.map(addon => addon.uninstall()));
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  assertTelemetryRecorded([
+    ["manage", "main", dialogId],
+    ["search", "dialog", dialogId],
+    ["add", "dialog", dialogId, { installId }],
+
+    // Cancel is recorded when the tab is closed.
+    ["cancel", "dialog", dialogId],
+  ]);
+});
+
+add_task(async function testReorderingBrowserLanguages() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["intl.multilingual.enabled", true],
+      ["intl.multilingual.downloadEnabled", true],
+      ["intl.multilingual.liveReload", false],
+      ["intl.multilingual.liveReloadBidirectional", false],
+      ["intl.locale.requested", "en-US,pl,he,de"],
+      ["extensions.langpacks.signatures.required", false],
+    ],
+  });
+
+  // Install all the available langpacks.
+  let langpacks = await createTestLangpacks();
+  let addons = await Promise.all(
+    langpacks.map(async ([locale, file]) => {
+      let install = await AddonTestUtils.promiseInstallFile(file);
+      return install.addon;
+    })
+  );
+
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+
+  let doc = gBrowser.contentDocument;
+  let messageBar = doc.getElementById("confirmBrowserLanguage");
+  is(messageBar.hidden, true, "The message bar is hidden at first");
+
+  // Open the dialog.
+  let { dialog, dialogDoc, selected } = await openDialog(doc);
+  let firstDialogId = getDialogId(dialogDoc);
+
+  // The initial order is set by the pref, filtered by available.
+  assertLocaleOrder(selected, "en-US,pl,he");
+
+  // Moving pl down changes the order.
+  selected.selectedItem = selected.querySelector("[value='pl']");
+  dialogDoc.getElementById("down").doCommand();
+  assertLocaleOrder(selected, "en-US,he,pl");
+
+  // Accepting the change shows the confirm message bar.
+  let dialogClosed = BrowserTestUtils.waitForEvent(dialog, "dialogclosing");
+  dialog.acceptDialog();
+  await dialogClosed;
+
+  // The message bar uses async `formatValues` and that may resolve
+  // after the dialog is closed.
+  await BrowserTestUtils.waitForMutationCondition(
+    messageBar,
+    { attributes: true },
+    () => !messageBar.hidden
+  );
+  is(
+    messageBar.querySelector("button").getAttribute("locales"),
+    "en-US,he,pl",
+    "The locales are set on the message bar button"
+  );
+
+  // Open the dialog again.
+  let newDialog = await openDialog(doc);
+  dialog = newDialog.dialog;
+  dialogDoc = newDialog.dialogDoc;
+  let secondDialogId = getDialogId(dialogDoc);
+  selected = newDialog.selected;
+
+  // The initial order comes from the previous settings.
+  assertLocaleOrder(selected, "en-US,he,pl");
+
+  // Select pl in the list.
+  selected.selectedItem = selected.querySelector("[value='pl']");
+  // Move pl back up.
+  dialogDoc.getElementById("up").doCommand();
+  assertLocaleOrder(selected, "en-US,pl,he");
+
+  // Accepting the change hides the confirm message bar.
+  dialogClosed = BrowserTestUtils.waitForEvent(dialog, "dialogclosing");
+  dialog.acceptDialog();
+  await dialogClosed;
+  is(messageBar.hidden, true, "The message bar is hidden again");
+
+  ok(firstDialogId, "There was an id on the first dialog");
+  ok(secondDialogId, "There was an id on the second dialog");
+  Assert.notEqual(
+    firstDialogId,
+    secondDialogId,
+    "The dialog ids are different"
+  );
+  Assert.less(
+    parseInt(firstDialogId),
+    parseInt(secondDialogId),
+    "The second dialog id is larger than the first"
+  );
+
+  await Promise.all(addons.map(addon => addon.uninstall()));
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  assertTelemetryRecorded([
+    ["manage", "main", firstDialogId],
+    ["reorder", "dialog", firstDialogId],
+    ["accept", "dialog", firstDialogId],
+    ["manage", "main", secondDialogId],
+    ["reorder", "dialog", secondDialogId],
+    ["accept", "dialog", secondDialogId],
+  ]);
+});
+
+add_task(async function testAddAndRemoveSelectedLanguages() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["intl.multilingual.enabled", true],
+      ["intl.multilingual.downloadEnabled", true],
+      ["intl.multilingual.liveReload", false],
+      ["intl.multilingual.liveReloadBidirectional", false],
+      ["intl.locale.requested", "en-US"],
+      ["extensions.langpacks.signatures.required", false],
+    ],
+  });
+
+  let langpacks = await createTestLangpacks();
+  let addons = await Promise.all(
+    langpacks.map(async ([locale, file]) => {
+      let install = await AddonTestUtils.promiseInstallFile(file);
+      return install.addon;
+    })
+  );
+
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+
+  let doc = gBrowser.contentDocument;
+  let messageBar = doc.getElementById("confirmBrowserLanguage");
+  is(messageBar.hidden, true, "The message bar is hidden at first");
+
+  // Open the dialog.
+  let { dialog, dialogDoc, available, selected } = await openDialog(doc);
+  let dialogId = getDialogId(dialogDoc);
+
+  // loadLocalesFromAMO is async but `initAvailableLocales` doesn't wait
+  // for it to be resolved, so we have to wait for the list to be populated
+  // before we test for its values.
+  await BrowserTestUtils.waitForMutationCondition(
+    available.menupopup,
+    { attributes: true, childList: true },
+    () => {
+      let listLocales = Array.from(available.menupopup.children).filter(
+        item => item.value && item.value != "search"
+      );
+      return listLocales.length == 3;
+    }
+  );
+  // The initial order is set by the pref.
+  assertLocaleOrder(selected, "en-US");
+  assertAvailableLocales(available, ["fr", "pl", "he"]);
+
+  // Add pl and fr to selected.
+  await selectLocale("pl", available, selected, dialogDoc);
+  await selectLocale("fr", available, selected, dialogDoc);
+
+  assertLocaleOrder(selected, "fr,pl,en-US");
+  assertAvailableLocales(available, ["he"]);
+
+  // Remove pl and fr from selected.
+  dialogDoc.getElementById("remove").doCommand();
+  dialogDoc.getElementById("remove").doCommand();
+  assertLocaleOrder(selected, "en-US");
+  assertAvailableLocales(available, ["fr", "pl", "he"]);
+
+  // Add he to selected.
+  await selectLocale("he", available, selected, dialogDoc);
+  assertLocaleOrder(selected, "he,en-US");
+  assertAvailableLocales(available, ["pl", "fr"]);
+
+  // Accepting the change shows the confirm message bar.
+  let dialogClosed = BrowserTestUtils.waitForEvent(dialog, "dialogclosing");
+  dialog.acceptDialog();
+  await dialogClosed;
+
+  await waitForMutation(
+    messageBar,
+    { attributes: true, attributeFilter: ["hidden"] },
+    target => !target.hidden
+  );
+
+  is(messageBar.hidden, false, "The message bar is now visible");
+  is(
+    messageBar.querySelector("button").getAttribute("locales"),
+    "he,en-US",
+    "The locales are set on the message bar button"
+  );
+
+  await Promise.all(addons.map(addon => addon.uninstall()));
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  assertTelemetryRecorded([
+    ["manage", "main", dialogId],
+
+    // Install id is not recorded since it was already installed.
+    ["add", "dialog", dialogId],
+    ["add", "dialog", dialogId],
+
+    ["remove", "dialog", dialogId],
+    ["remove", "dialog", dialogId],
+
+    ["add", "dialog", dialogId],
+    ["accept", "dialog", dialogId],
+  ]);
+});
+
+add_task(async function testInstallFromAMO() {
+  let langpacks = await AddonManager.getAddonsByTypes(["locale"]);
+  is(langpacks.length, 0, "There are no langpacks installed");
+
+  let langpacksFile = await createLanguageToolsFile();
+  let langpacksUrl = Services.io.newFileURI(langpacksFile).spec;
+  let dictionaryBrowseFile = await createDictionaryBrowseResults();
+  let browseApiEndpoint = Services.io.newFileURI(dictionaryBrowseFile).spec;
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["intl.multilingual.enabled", true],
+      ["intl.multilingual.downloadEnabled", true],
+      ["intl.multilingual.liveReload", false],
+      ["intl.multilingual.liveReloadBidirectional", false],
+      ["intl.locale.requested", "en-US"],
+      ["extensions.getAddons.langpacks.url", langpacksUrl],
+      ["extensions.langpacks.signatures.required", false],
+      ["extensions.getAddons.get.url", browseApiEndpoint],
+    ],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+
+  let doc = gBrowser.contentDocument;
+  let messageBar = doc.getElementById("confirmBrowserLanguage");
+  is(messageBar.hidden, true, "The message bar is hidden at first");
+
+  // Verify only en-US is listed on the main pane.
+  let getMainPaneLocales = () => {
+    let available = doc.getElementById("primaryBrowserLocale");
+    let availableLocales = Array.from(available.menupopup.children);
+    return availableLocales
+      .map(item => item.value)
+      .sort()
+      .join(",");
+  };
+  is(getMainPaneLocales(), "en-US,search", "Only en-US installed to start");
+
+  // Open the dialog.
+  let { dialog, dialogDoc, available, selected } = await openDialog(doc, true);
+  let firstDialogId = getDialogId(dialogDoc);
+
+  // Make sure the message bar is still hidden.
+  is(
+    messageBar.hidden,
+    true,
+    "The message bar is still hidden after searching"
+  );
+
+  if (available.itemCount == 1) {
+    await waitForMutation(
+      available.menupopup,
+      { childList: true },
+      target => available.itemCount > 1
+    );
+  }
+
+  // The initial order is set by the pref.
+  assertLocaleOrder(selected, "en-US");
+  assertAvailableLocales(available, ["fr", "he", "pl"]);
+  is(
+    Services.locale.availableLocales.join(","),
+    "en-US",
+    "There is only one installed locale"
+  );
+
+  // Verify that there are no extra dictionaries.
+  let dicts = await AddonManager.getAddonsByTypes(["dictionary"]);
+  is(dicts.length, 0, "There are no installed dictionaries");
+
+  let installId = null;
+  AddonTestUtils.promiseInstallEvent("onInstallEnded").then(([install]) => {
+    installId = install.installId;
+  });
+
+  // Add Polish, this will install the langpack.
+  await selectLocale("pl", available, selected, dialogDoc);
+
+  ok(installId, "We got an installId for the langpack installation");
+
+  let langpack = await AddonManager.getAddonByID(langpackId("pl"));
+  Assert.deepEqual(
+    langpack.installTelemetryInfo,
+    { source: "about:preferences" },
+    "The source is set to preferences"
+  );
+
+  // Verify the list is correct.
+  assertLocaleOrder(selected, "pl,en-US");
+  assertAvailableLocales(available, ["fr", "he"]);
+  is(
+    Services.locale.availableLocales.sort().join(","),
+    "en-US,pl",
+    "Polish is now installed"
+  );
+
+  await BrowserTestUtils.waitForCondition(async () => {
+    let newDicts = await AddonManager.getAddonsByTypes(["dictionary"]);
+    let done = !!newDicts.length;
+
+    if (done) {
+      is(
+        newDicts[0].id,
+        DICTIONARY_ID_PL,
+        "The polish dictionary was installed"
+      );
+    }
+
+    return done;
+  });
+
+  // Move pl down the list, which prevents an error since it isn't valid.
+  dialogDoc.getElementById("down").doCommand();
+  assertLocaleOrder(selected, "en-US,pl");
+
+  // Test that disabling the langpack removes it from the list.
+  let dialogClosed = BrowserTestUtils.waitForEvent(dialog, "dialogclosing");
+  dialog.acceptDialog();
+  await dialogClosed;
+
+  // Verify pl is now available to select.
+  is(getMainPaneLocales(), "en-US,pl,search", "en-US and pl now available");
+
+  // Disable the Polish langpack.
+  langpack = await AddonManager.getAddonByID("langpack-pl@firefox.mozilla.org");
+  await langpack.disable();
+
+  ({ dialogDoc, available, selected } = await openDialog(doc, true));
+  let secondDialogId = getDialogId(dialogDoc);
+
+  // Wait for the available langpacks to load.
+  if (available.itemCount == 1) {
+    await waitForMutation(
+      available.menupopup,
+      { childList: true },
+      target => available.itemCount > 1
+    );
+  }
+  assertLocaleOrder(selected, "en-US");
+  assertAvailableLocales(available, ["fr", "he", "pl"]);
+
+  // Uninstall the langpack and dictionary.
+  let installs = await AddonManager.getAddonsByTypes(["locale", "dictionary"]);
+  is(installs.length, 2, "There is one langpack and one dictionary installed");
+  await Promise.all(installs.map(item => item.uninstall()));
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  assertTelemetryRecorded([
+    // First dialog installs a locale and accepts.
+    ["search", "main", firstDialogId],
+    // It has an installId since it was downloaded.
+    ["add", "dialog", firstDialogId, { installId }],
+    // It got moved down to avoid errors with finding translations.
+    ["reorder", "dialog", firstDialogId],
+    ["accept", "dialog", firstDialogId],
+
+    // The second dialog just checks the state and is closed with the tab.
+    ["search", "main", secondDialogId],
+    ["cancel", "dialog", secondDialogId],
+  ]);
+});
+
+let hasSearchOption = popup =>
+  Array.from(popup.children).some(el => el.value == "search");
+
+add_task(async function testDownloadEnabled() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["intl.multilingual.enabled", true],
+      ["intl.multilingual.downloadEnabled", true],
+      ["intl.multilingual.liveReload", false],
+      ["intl.multilingual.liveReloadBidirectional", false],
+    ],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  let doc = gBrowser.contentDocument;
+
+  let defaultMenulist = doc.getElementById("primaryBrowserLocale");
+  ok(
+    hasSearchOption(defaultMenulist.menupopup),
+    "There's a search option in the General pane"
+  );
+
+  let { available } = await openDialog(doc, false);
+  ok(
+    hasSearchOption(available.menupopup),
+    "There's a search option in the dialog"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function testDownloadDisabled() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["intl.multilingual.enabled", true],
+      ["intl.multilingual.downloadEnabled", false],
+      ["intl.multilingual.liveReload", false],
+      ["intl.multilingual.liveReloadBidirectional", false],
+    ],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  let doc = gBrowser.contentDocument;
+
+  let defaultMenulist = doc.getElementById("primaryBrowserLocale");
+  ok(
+    !hasSearchOption(defaultMenulist.menupopup),
+    "There's no search option in the General pane"
+  );
+
+  let { available } = await openDialog(doc, false);
+  ok(
+    !hasSearchOption(available.menupopup),
+    "There's no search option in the dialog"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function testReorderMainPane() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["intl.multilingual.enabled", true],
+      ["intl.multilingual.downloadEnabled", false],
+      ["intl.multilingual.liveReload", false],
+      ["intl.multilingual.liveReloadBidirectional", false],
+      ["intl.locale.requested", "en-US"],
+      ["extensions.langpacks.signatures.required", false],
+    ],
+  });
+
+  // Clear the telemetry from other tests.
+  Services.telemetry.clearEvents();
+
+  let langpacks = await createTestLangpacks();
+  let addons = await Promise.all(
+    langpacks.map(async ([locale, file]) => {
+      let install = await AddonTestUtils.promiseInstallFile(file);
+      return install.addon;
+    })
+  );
+
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  let doc = gBrowser.contentDocument;
+
+  let messageBar = doc.getElementById("confirmBrowserLanguage");
+  is(messageBar.hidden, true, "The message bar is hidden at first");
+
+  let available = doc.getElementById("primaryBrowserLocale");
+  let availableLocales = Array.from(available.menupopup.children);
+  let availableCodes = availableLocales
+    .map(item => item.value)
+    .sort()
+    .join(",");
+  is(
+    availableCodes,
+    "en-US,fr,he,pl",
+    "All of the available locales are listed"
+  );
+
+  is(available.selectedItem.value, "en-US", "English is selected");
+
+  let hebrew = availableLocales.find(item => item.value == "he");
+  hebrew.click();
+  available.menupopup.hidePopup();
+
+  await BrowserTestUtils.waitForCondition(
+    () => !messageBar.hidden,
+    "Wait for message bar to show"
+  );
+
+  is(messageBar.hidden, false, "The message bar is now shown");
+  is(
+    messageBar.querySelector("button").getAttribute("locales"),
+    "he,en-US",
+    "The locales are set on the message bar button"
+  );
+
+  await Promise.all(addons.map(addon => addon.uninstall()));
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  assertTelemetryRecorded([["reorder", "main"]]);
+});
+
+add_task(async function testLiveLanguageReloading() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["intl.multilingual.enabled", true],
+      ["intl.multilingual.downloadEnabled", true],
+      ["intl.multilingual.liveReload", true],
+      ["intl.multilingual.liveReloadBidirectional", false],
+      ["intl.locale.requested", "en-US,fr,he,de"],
+      ["extensions.langpacks.signatures.required", false],
+    ],
+  });
+
+  // Clear the telemetry from other tests.
+  Services.telemetry.clearEvents();
+
+  let langpacks = await createTestLangpacks();
+  let addons = await Promise.all(
+    langpacks.map(async ([locale, file]) => {
+      let install = await AddonTestUtils.promiseInstallFile(file);
+      return install.addon;
+    })
+  );
+
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+
+  let doc = gBrowser.contentDocument;
+
+  let available = doc.getElementById("primaryBrowserLocale");
+  let availableLocales = Array.from(available.menupopup.children);
+
+  is(
+    Services.locale.appLocaleAsBCP47,
+    "en-US",
+    "The app locale starts as English."
+  );
+
+  Assert.deepEqual(
+    Services.locale.requestedLocales,
+    ["en-US", "fr", "he", "de"],
+    "The locale order starts as what was initially requested."
+  );
+
+  // French and English are both LTR languages.
+  let french = availableLocales.find(item => item.value == "fr");
+
+  french.click();
+  available.menupopup.hidePopup();
+
+  is(
+    Services.locale.appLocaleAsBCP47,
+    "fr",
+    "The app locale was changed to French"
+  );
+
+  Assert.deepEqual(
+    Services.locale.requestedLocales,
+    ["fr", "en-US", "he", "de"],
+    "The locale order is switched to french first."
+  );
+
+  await Promise.all(addons.map(addon => addon.uninstall()));
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  assertTelemetryRecorded([["reorder", "main"]]);
+});
+
+add_task(async function testLiveLanguageReloadingBidiOff() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["intl.multilingual.enabled", true],
+      ["intl.multilingual.downloadEnabled", true],
+      ["intl.multilingual.liveReload", true],
+      ["intl.multilingual.liveReloadBidirectional", false],
+      ["intl.locale.requested", "en-US,fr,he,de"],
+      ["extensions.langpacks.signatures.required", false],
+    ],
+  });
+
+  // Clear the telemetry from other tests.
+  Services.telemetry.clearEvents();
+
+  let langpacks = await createTestLangpacks();
+  let addons = await Promise.all(
+    langpacks.map(async ([locale, file]) => {
+      let install = await AddonTestUtils.promiseInstallFile(file);
+      return install.addon;
+    })
+  );
+
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+
+  let doc = gBrowser.contentDocument;
+
+  let available = doc.getElementById("primaryBrowserLocale");
+  let availableLocales = Array.from(available.menupopup.children);
+
+  is(
+    Services.locale.appLocaleAsBCP47,
+    "en-US",
+    "The app locale starts as English."
+  );
+
+  Assert.deepEqual(
+    Services.locale.requestedLocales,
+    ["en-US", "fr", "he", "de"],
+    "The locale order starts as what was initially requested."
+  );
+
+  let messageBar = doc.getElementById("confirmBrowserLanguage");
+  is(messageBar.hidden, true, "The message bar is hidden at first");
+
+  // English is LTR and Hebrew is RTL.
+  let hebrew = availableLocales.find(item => item.value == "he");
+
+  hebrew.click();
+  available.menupopup.hidePopup();
+
+  await BrowserTestUtils.waitForCondition(
+    () => !messageBar.hidden,
+    "Wait for message bar to show"
+  );
+
+  is(messageBar.hidden, false, "The message bar is now shown");
+
+  is(
+    Services.locale.appLocaleAsBCP47,
+    "en-US",
+    "The app locale remains in English"
+  );
+
+  Assert.deepEqual(
+    Services.locale.requestedLocales,
+    ["en-US", "fr", "he", "de"],
+    "The locale order did not change."
+  );
+
+  await Promise.all(addons.map(addon => addon.uninstall()));
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  assertTelemetryRecorded([["reorder", "main"]]);
+});
+
+add_task(async function testLiveLanguageReloadingBidiOn() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["intl.multilingual.enabled", true],
+      ["intl.multilingual.downloadEnabled", true],
+      ["intl.multilingual.liveReload", true],
+      ["intl.multilingual.liveReloadBidirectional", true],
+      ["intl.locale.requested", "en-US,fr,he,de"],
+      ["extensions.langpacks.signatures.required", false],
+    ],
+  });
+
+  // Clear the telemetry from other tests.
+  Services.telemetry.clearEvents();
+
+  let langpacks = await createTestLangpacks();
+  let addons = await Promise.all(
+    langpacks.map(async ([locale, file]) => {
+      let install = await AddonTestUtils.promiseInstallFile(file);
+      return install.addon;
+    })
+  );
+
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+
+  let doc = gBrowser.contentDocument;
+
+  let available = doc.getElementById("primaryBrowserLocale");
+  let availableLocales = Array.from(available.menupopup.children);
+
+  is(
+    Services.locale.appLocaleAsBCP47,
+    "en-US",
+    "The app locale starts as English."
+  );
+
+  Assert.deepEqual(
+    Services.locale.requestedLocales,
+    ["en-US", "fr", "he", "de"],
+    "The locale order starts as what was initially requested."
+  );
+
+  let messageBar = doc.getElementById("confirmBrowserLanguage");
+  is(messageBar.hidden, true, "The message bar is hidden at first");
+
+  // English is LTR and Hebrew is RTL.
+  let hebrew = availableLocales.find(item => item.value == "he");
+
+  hebrew.click();
+  available.menupopup.hidePopup();
+
+  is(messageBar.hidden, true, "The message bar is still hidden");
+
+  is(
+    Services.locale.appLocaleAsBCP47,
+    "he",
+    "The app locale was changed to Hebrew."
+  );
+
+  Assert.deepEqual(
+    Services.locale.requestedLocales,
+    ["he", "en-US", "fr", "de"],
+    "The locale changed with Hebrew first."
+  );
+
+  await Promise.all(addons.map(addon => addon.uninstall()));
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  assertTelemetryRecorded([["reorder", "main"]]);
+});
diff --git a/browser/components/preferences/tests/browser_bug1018066_resetScrollPosition.js b/browser/components/preferences/tests/browser_bug1018066_resetScrollPosition.js
new file mode 100644
index 0000000000..bc928656ab
--- /dev/null
+++ b/browser/components/preferences/tests/browser_bug1018066_resetScrollPosition.js
@@ -0,0 +1,30 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+var originalWindowHeight;
+registerCleanupFunction(function () {
+  window.resizeTo(window.outerWidth, originalWindowHeight);
+  while (gBrowser.tabs[1]) {
+    gBrowser.removeTab(gBrowser.tabs[1]);
+  }
+});
+
+add_task(async function () {
+  originalWindowHeight = window.outerHeight;
+  window.resizeTo(window.outerWidth, 300);
+  let prefs = await openPreferencesViaOpenPreferencesAPI("paneSearch", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneSearch", "Search pane was selected");
+  let mainContent = gBrowser.contentDocument.querySelector(".main-content");
+  mainContent.scrollTop = 50;
+  is(mainContent.scrollTop, 50, "main-content should be scrolled 50 pixels");
+
+  await gBrowser.contentWindow.gotoPref("paneGeneral");
+
+  is(
+    mainContent.scrollTop,
+    0,
+    "Switching to a different category should reset the scroll position"
+  );
+});
diff --git a/browser/components/preferences/tests/browser_bug1020245_openPreferences_to_paneContent.js b/browser/components/preferences/tests/browser_bug1020245_openPreferences_to_paneContent.js
new file mode 100644
index 0000000000..26e79b648d
--- /dev/null
+++ b/browser/components/preferences/tests/browser_bug1020245_openPreferences_to_paneContent.js
@@ -0,0 +1,163 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test opening to the differerent panes and subcategories in Preferences
+add_task(async function () {
+  let prefs = await openPreferencesViaOpenPreferencesAPI("panePrivacy");
+  is(prefs.selectedPane, "panePrivacy", "Privacy pane was selected");
+  prefs = await openPreferencesViaHash("privacy");
+  is(
+    prefs.selectedPane,
+    "panePrivacy",
+    "Privacy pane is selected when hash is 'privacy'"
+  );
+  prefs = await openPreferencesViaOpenPreferencesAPI("nonexistant-category");
+  is(
+    prefs.selectedPane,
+    "paneGeneral",
+    "General pane is selected by default when a nonexistant-category is requested"
+  );
+  prefs = await openPreferencesViaHash("nonexistant-category");
+  is(
+    prefs.selectedPane,
+    "paneGeneral",
+    "General pane is selected when hash is a nonexistant-category"
+  );
+  prefs = await openPreferencesViaHash();
+  is(prefs.selectedPane, "paneGeneral", "General pane is selected by default");
+  prefs = await openPreferencesViaOpenPreferencesAPI("privacy-reports", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "panePrivacy", "Privacy pane is selected by default");
+  let doc = gBrowser.contentDocument;
+  is(
+    doc.location.hash,
+    "#privacy",
+    "The subcategory should be removed from the URI"
+  );
+  await TestUtils.waitForCondition(
+    () => doc.querySelector(".spotlight"),
+    "Wait for the reports section is spotlighted."
+  );
+  is(
+    doc.querySelector(".spotlight").getAttribute("data-subcategory"),
+    "reports",
+    "The reports section is spotlighted."
+  );
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+// Test opening Preferences with subcategory on an existing Preferences tab. See bug 1358475.
+add_task(async function () {
+  let prefs = await openPreferencesViaOpenPreferencesAPI("general", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneGeneral", "General pane is selected by default");
+  let doc = gBrowser.contentDocument;
+  is(
+    doc.location.hash,
+    "#general",
+    "The subcategory should be removed from the URI"
+  );
+  // The reasons that here just call the `openPreferences` API without the helping function are
+  //   - already opened one about:preferences tab up there and
+  //   - the goal is to test on the existing tab and
+  //   - using `openPreferencesViaOpenPreferencesAPI` would introduce more handling of additional about:blank and unneccessary event
+  await openPreferences("privacy-reports");
+  let selectedPane = gBrowser.contentWindow.history.state;
+  is(selectedPane, "panePrivacy", "Privacy pane should be selected");
+  is(
+    doc.location.hash,
+    "#privacy",
+    "The subcategory should be removed from the URI"
+  );
+  await TestUtils.waitForCondition(
+    () => doc.querySelector(".spotlight"),
+    "Wait for the reports section is spotlighted."
+  );
+  is(
+    doc.querySelector(".spotlight").getAttribute("data-subcategory"),
+    "reports",
+    "The reports section is spotlighted."
+  );
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+// Test opening to a subcategory displays the correct values for preferences
+add_task(async function () {
+  // Skip if crash reporting isn't enabled since the checkbox will be missing.
+  if (!AppConstants.MOZ_CRASHREPORTER) {
+    return;
+  }
+
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.crashReports.unsubmittedCheck.autoSubmit2", true]],
+  });
+  await openPreferencesViaOpenPreferencesAPI("privacy-reports", {
+    leaveOpen: true,
+  });
+
+  let doc = gBrowser.contentDocument;
+  ok(
+    doc.querySelector("#automaticallySubmitCrashesBox").checked,
+    "Checkbox for automatically submitting crashes should be checked when the pref is true and only Reports are requested"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  await SpecialPowers.popPrefEnv();
+});
+
+add_task(async function () {
+  // Skip if crash reporting isn't enabled since the checkbox will be missing.
+  if (!AppConstants.MOZ_CRASHREPORTER) {
+    return;
+  }
+
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.crashReports.unsubmittedCheck.autoSubmit2", false]],
+  });
+  await openPreferencesViaOpenPreferencesAPI("privacy-reports", {
+    leaveOpen: true,
+  });
+
+  let doc = gBrowser.contentDocument;
+  ok(
+    !doc.querySelector("#automaticallySubmitCrashesBox").checked,
+    "Checkbox for automatically submitting crashes should not be checked when the pref is false only Reports are requested"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  await SpecialPowers.popPrefEnv();
+});
+
+function openPreferencesViaHash(aPane) {
+  return new Promise(resolve => {
+    let finalPrefPaneLoaded = TestUtils.topicObserved(
+      "sync-pane-loaded",
+      () => true
+    );
+    gBrowser.selectedTab = BrowserTestUtils.addTab(
+      gBrowser,
+      "about:preferences" + (aPane ? "#" + aPane : "")
+    );
+    let newTabBrowser = gBrowser.selectedBrowser;
+
+    newTabBrowser.addEventListener(
+      "Initialized",
+      function () {
+        newTabBrowser.contentWindow.addEventListener(
+          "load",
+          async function () {
+            let win = gBrowser.contentWindow;
+            let selectedPane = win.history.state;
+            await finalPrefPaneLoaded;
+            gBrowser.removeCurrentTab();
+            resolve({ selectedPane });
+          },
+          { once: true }
+        );
+      },
+      { capture: true, once: true }
+    );
+  });
+}
diff --git a/browser/components/preferences/tests/browser_bug1184989_prevent_scrolling_when_preferences_flipped.js b/browser/components/preferences/tests/browser_bug1184989_prevent_scrolling_when_preferences_flipped.js
new file mode 100644
index 0000000000..ef387f9a9d
--- /dev/null
+++ b/browser/components/preferences/tests/browser_bug1184989_prevent_scrolling_when_preferences_flipped.js
@@ -0,0 +1,116 @@
+const triggeringPrincipal_base64 = E10SUtils.SERIALIZED_SYSTEMPRINCIPAL;
+
+add_task(async function () {
+  waitForExplicitFinish();
+
+  const tabURL =
+    getRootDirectory(gTestPath) +
+    "browser_bug1184989_prevent_scrolling_when_preferences_flipped.xhtml";
+
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: tabURL },
+    async function (browser) {
+      let doc = browser.contentDocument;
+      let container = doc.getElementById("container");
+
+      // Test button
+      let button = doc.getElementById("button");
+      button.focus();
+      let initialScrollTop = container.scrollTop;
+      EventUtils.sendString(" ");
+      await checkPageScrolling(container, "button", initialScrollTop);
+
+      // Test checkbox
+      let checkbox = doc.getElementById("checkbox");
+      checkbox.focus();
+      initialScrollTop = container.scrollTop;
+      EventUtils.sendString(" ");
+      ok(checkbox.checked, "Checkbox is checked");
+      await checkPageScrolling(container, "checkbox", initialScrollTop);
+
+      // Test radio
+      let radiogroup = doc.getElementById("radiogroup");
+      radiogroup.focus();
+      initialScrollTop = container.scrollTop;
+      EventUtils.sendString(" ");
+      await checkPageScrolling(container, "radio", initialScrollTop);
+    }
+  );
+
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "about:preferences#search" },
+    async function (browser) {
+      let doc = browser.contentDocument;
+      let container = doc.getElementsByClassName("main-content")[0];
+
+      // Test search
+      let engineList = doc.getElementById("engineList");
+      engineList.focus();
+      let initialScrollTop = container.scrollTop;
+      EventUtils.sendString(" ");
+      is(
+        engineList.view.selection.currentIndex,
+        0,
+        "Search engineList is selected"
+      );
+      EventUtils.sendString(" ");
+      await checkPageScrolling(
+        container,
+        "search engineList",
+        initialScrollTop
+      );
+    }
+  );
+
+  // Test session restore
+  const CRASH_URL = "about:mozilla";
+  const CRASH_FAVICON = "chrome://branding/content/icon32.png";
+  const CRASH_SHENTRY = { url: CRASH_URL };
+  const CRASH_TAB = { entries: [CRASH_SHENTRY], image: CRASH_FAVICON };
+  const CRASH_STATE = { windows: [{ tabs: [CRASH_TAB] }] };
+
+  const TAB_URL = "about:sessionrestore";
+  const TAB_FORMDATA = { url: TAB_URL, id: { sessionData: CRASH_STATE } };
+  const TAB_SHENTRY = { url: TAB_URL, triggeringPrincipal_base64 };
+  const TAB_STATE = { entries: [TAB_SHENTRY], formdata: TAB_FORMDATA };
+
+  let tab = (gBrowser.selectedTab = BrowserTestUtils.addTab(
+    gBrowser,
+    "about:blank"
+  ));
+
+  // Fake a post-crash tab
+  SessionStore.setTabState(tab, JSON.stringify(TAB_STATE));
+
+  await BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  let doc = tab.linkedBrowser.contentDocument;
+
+  // Make body scrollable
+  doc.body.style.height = doc.body.clientHeight + 100 + "px";
+
+  let tabsToggle = doc.getElementById("tabsToggle");
+  tabsToggle.focus();
+  let initialScrollTop = doc.documentElement.scrollTop;
+  EventUtils.sendString(" ");
+  await checkPageScrolling(
+    doc.documentElement,
+    "session restore",
+    initialScrollTop
+  );
+
+  gBrowser.removeCurrentTab();
+  finish();
+});
+
+function checkPageScrolling(container, type, initialScrollTop = 0) {
+  return new Promise(resolve => {
+    setTimeout(() => {
+      is(
+        container.scrollTop,
+        initialScrollTop,
+        "Page should not scroll when " + type + " flipped"
+      );
+      resolve();
+    }, 0);
+  });
+}
diff --git a/browser/components/preferences/tests/browser_bug1184989_prevent_scrolling_when_preferences_flipped.xhtml b/browser/components/preferences/tests/browser_bug1184989_prevent_scrolling_when_preferences_flipped.xhtml
new file mode 100644
index 0000000000..8b3e39a39c
--- /dev/null
+++ b/browser/components/preferences/tests/browser_bug1184989_prevent_scrolling_when_preferences_flipped.xhtml
@@ -0,0 +1,26 @@
+<?xml version="1.0"?>
+<!--
+  XUL Widget Test for Bug 1184989
+  -->
+<window title="Bug 1184989 Test"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+
+<vbox id="container" style="height: 200px; overflow: auto;">
+  <vbox style="height: 500px;">
+    <hbox>
+      <button id="button" label="button" />
+    </hbox>
+
+    <hbox>
+      <checkbox id="checkbox" label="checkbox" />
+    </hbox>
+
+    <hbox>
+      <radiogroup id="radiogroup">
+        <radio id="radio" label="radio" />
+      </radiogroup>
+    </hbox>
+  </vbox>
+</vbox>
+
+</window>
diff --git a/browser/components/preferences/tests/browser_bug1547020_lockedDownloadDir.js b/browser/components/preferences/tests/browser_bug1547020_lockedDownloadDir.js
new file mode 100644
index 0000000000..cd5b00b5f2
--- /dev/null
+++ b/browser/components/preferences/tests/browser_bug1547020_lockedDownloadDir.js
@@ -0,0 +1,24 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function () {
+  Services.prefs.lockPref("browser.download.useDownloadDir");
+
+  await openPreferencesViaOpenPreferencesAPI("general", { leaveOpen: true });
+  let doc = gBrowser.selectedBrowser.contentDocument;
+
+  var downloadFolder = doc.getElementById("downloadFolder");
+  var chooseFolder = doc.getElementById("chooseFolder");
+  is(
+    downloadFolder.disabled,
+    false,
+    "Download folder field should not be disabled."
+  );
+  is(chooseFolder.disabled, false, "Choose folder should not be disabled.");
+
+  gBrowser.removeCurrentTab();
+
+  Services.prefs.unlockPref("browser.download.useDownloadDir");
+});
diff --git a/browser/components/preferences/tests/browser_bug1579418.js b/browser/components/preferences/tests/browser_bug1579418.js
new file mode 100644
index 0000000000..a179ae9936
--- /dev/null
+++ b/browser/components/preferences/tests/browser_bug1579418.js
@@ -0,0 +1,55 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function default_homepage_test() {
+  let oldHomepagePref = Services.prefs.getCharPref("browser.startup.homepage");
+  let oldStartpagePref = Services.prefs.getIntPref("browser.startup.page");
+
+  await openPreferencesViaOpenPreferencesAPI("paneHome", { leaveOpen: true });
+
+  let doc = gBrowser.contentDocument;
+  let homeMode = doc.getElementById("homeMode");
+  let customSettings = doc.getElementById("customSettings");
+
+  // HOME_MODE_FIREFOX_HOME
+  homeMode.value = 0;
+
+  homeMode.dispatchEvent(new Event("command"));
+
+  is(Services.prefs.getCharPref("browser.startup.homepage"), "about:home");
+
+  // HOME_MODE_BLANK
+  homeMode.value = 1;
+
+  homeMode.dispatchEvent(new Event("command"));
+
+  await TestUtils.waitForCondition(
+    () => customSettings.hidden === true,
+    "Wait for customSettings to be hidden."
+  );
+
+  is(
+    Services.prefs.getCharPref("browser.startup.homepage"),
+    "chrome://browser/content/blanktab.html"
+  );
+
+  // HOME_MODE_CUSTOM
+  homeMode.value = 2;
+
+  homeMode.dispatchEvent(new Event("command"));
+
+  await TestUtils.waitForCondition(
+    () => customSettings.hidden === false,
+    "Wait for customSettings to be shown."
+  );
+
+  is(customSettings.hidden, false, "homePageURL should be visible");
+
+  registerCleanupFunction(async () => {
+    Services.prefs.setCharPref("browser.startup.homepage", oldHomepagePref);
+    Services.prefs.setIntPref("browser.startup.page", oldStartpagePref);
+    BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  });
+});
diff --git a/browser/components/preferences/tests/browser_bug410900.js b/browser/components/preferences/tests/browser_bug410900.js
new file mode 100644
index 0000000000..4fd4bb21f5
--- /dev/null
+++ b/browser/components/preferences/tests/browser_bug410900.js
@@ -0,0 +1,47 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  waitForExplicitFinish();
+
+  // Setup a phony handler to ensure the app pane will be populated.
+  var handler = Cc["@mozilla.org/uriloader/web-handler-app;1"].createInstance(
+    Ci.nsIWebHandlerApp
+  );
+  handler.name = "App pane alive test";
+  handler.uriTemplate = "http://test.mozilla.org/%s";
+
+  var extps = Cc[
+    "@mozilla.org/uriloader/external-protocol-service;1"
+  ].getService(Ci.nsIExternalProtocolService);
+  var info = extps.getProtocolHandlerInfo("apppanetest");
+  info.possibleApplicationHandlers.appendElement(handler);
+
+  var hserv = Cc["@mozilla.org/uriloader/handler-service;1"].getService(
+    Ci.nsIHandlerService
+  );
+  hserv.store(info);
+
+  openPreferencesViaOpenPreferencesAPI("general", { leaveOpen: true })
+    .then(() => gBrowser.selectedBrowser.contentWindow.promiseLoadHandlersList)
+    .then(() => runTest(gBrowser.selectedBrowser.contentWindow));
+}
+
+function runTest(win) {
+  var rbox = win.document.getElementById("handlersView");
+  ok(rbox, "handlersView is present");
+
+  var items = rbox && rbox.getElementsByTagName("richlistitem");
+  ok(items && !!items.length, "App handler list populated");
+
+  var handlerAdded = false;
+  for (let i = 0; i < items.length; i++) {
+    if (items[i].getAttribute("type") == "apppanetest") {
+      handlerAdded = true;
+    }
+  }
+  ok(handlerAdded, "apppanetest protocol handler was successfully added");
+
+  gBrowser.removeCurrentTab();
+  finish();
+}
diff --git a/browser/components/preferences/tests/browser_bug731866.js b/browser/components/preferences/tests/browser_bug731866.js
new file mode 100644
index 0000000000..b090535a49
--- /dev/null
+++ b/browser/components/preferences/tests/browser_bug731866.js
@@ -0,0 +1,95 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const browserContainersGroupDisabled = !SpecialPowers.getBoolPref(
+  "privacy.userContext.ui.enabled"
+);
+const cookieBannerHandlingDisabled = !SpecialPowers.getBoolPref(
+  "cookiebanners.ui.desktop.enabled"
+);
+const updatePrefContainers = ["updatesCategory", "updateApp"];
+const updateContainersGroupDisabled =
+  AppConstants.platform === "win" &&
+  Services.sysinfo.getProperty("hasWinPackageId");
+
+function test() {
+  waitForExplicitFinish();
+  open_preferences(runTest);
+}
+
+var gElements;
+
+function checkElements(expectedPane) {
+  for (let element of gElements) {
+    // keyset elements fail is_element_visible checks because they are never visible.
+    // special-case the drmGroup item because its visibility depends on pref + OS version
+    if (element.nodeName == "keyset" || element.id === "drmGroup") {
+      continue;
+    }
+
+    // The browserContainersGroup is still only pref-on on Nightly
+    if (
+      element.id == "browserContainersGroup" &&
+      browserContainersGroupDisabled
+    ) {
+      is_element_hidden(
+        element,
+        "Disabled browserContainersGroup should be hidden"
+      );
+      continue;
+    }
+
+    // Cookie Banner Handling is currently disabled by default (bug 1800679)
+    if (
+      element.id == "cookieBannerHandlingGroup" &&
+      cookieBannerHandlingDisabled
+    ) {
+      is_element_hidden(
+        element,
+        "Disabled cookieBannerHandlingGroup should be hidden"
+      );
+      continue;
+    }
+
+    // Update prefs are hidden when running an MSIX build
+    if (
+      updatePrefContainers.includes(element.id) &&
+      updateContainersGroupDisabled
+    ) {
+      is_element_hidden(element, "Disabled " + element + " should be hidden");
+      continue;
+    }
+
+    let attributeValue = element.getAttribute("data-category");
+    let suffix = " (id=" + element.id + ")";
+    if (attributeValue == "pane" + expectedPane) {
+      is_element_visible(
+        element,
+        expectedPane + " elements should be visible" + suffix
+      );
+    } else {
+      is_element_hidden(
+        element,
+        "Elements not in " + expectedPane + " should be hidden" + suffix
+      );
+    }
+  }
+}
+
+async function runTest(win) {
+  is(gBrowser.currentURI.spec, "about:preferences", "about:preferences loaded");
+
+  let tab = win.document;
+  gElements = tab.getElementById("mainPrefPane").children;
+
+  let panes = ["General", "Search", "Privacy", "Sync"];
+
+  for (let pane of panes) {
+    await win.gotoPref("pane" + pane);
+    checkElements(pane);
+  }
+
+  gBrowser.removeCurrentTab();
+  win.close();
+  finish();
+}
diff --git a/browser/components/preferences/tests/browser_bug795764_cachedisabled.js b/browser/components/preferences/tests/browser_bug795764_cachedisabled.js
new file mode 100644
index 0000000000..97f5aaf48f
--- /dev/null
+++ b/browser/components/preferences/tests/browser_bug795764_cachedisabled.js
@@ -0,0 +1,62 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  waitForExplicitFinish();
+
+  // Adding one fake site so that the SiteDataManager would run.
+  // Otherwise, without any site then it would just return so we would end up in not testing SiteDataManager.
+  let principal =
+    Services.scriptSecurityManager.createContentPrincipalFromOrigin(
+      "https://www.foo.com"
+    );
+  Services.perms.addFromPrincipal(
+    principal,
+    "persistent-storage",
+    Ci.nsIPermissionManager.ALLOW_ACTION
+  );
+  registerCleanupFunction(function () {
+    Services.perms.removeFromPrincipal(principal, "persistent-storage");
+  });
+
+  SpecialPowers.pushPrefEnv({
+    set: [["privacy.userContext.ui.enabled", true]],
+  }).then(() => open_preferences(runTest));
+}
+
+async function runTest(win) {
+  is(gBrowser.currentURI.spec, "about:preferences", "about:preferences loaded");
+
+  let tab = win.document;
+  let elements = tab.getElementById("mainPrefPane").children;
+
+  // Test if privacy pane is opened correctly
+  await win.gotoPref("panePrivacy");
+  for (let element of elements) {
+    let attributeValue = element.getAttribute("data-category");
+
+    // Ignore the cookie banner handling section, as it is currently preffed
+    // off by default (bug 1800679).
+    if (element.id === "cookieBannerHandlingGroup") {
+      continue;
+    }
+
+    if (attributeValue == "panePrivacy") {
+      is_element_visible(element, "HTTPSOnly should be visible");
+
+      is_element_visible(
+        element,
+        `Privacy element of id=${element.id} should be visible`
+      );
+    } else {
+      is_element_hidden(
+        element,
+        `Non-Privacy element of id=${element.id} should be hidden`
+      );
+    }
+  }
+
+  gBrowser.removeCurrentTab();
+  win.close();
+  finish();
+}
diff --git a/browser/components/preferences/tests/browser_cert_export.js b/browser/components/preferences/tests/browser_cert_export.js
new file mode 100644
index 0000000000..48769f84e6
--- /dev/null
+++ b/browser/components/preferences/tests/browser_cert_export.js
@@ -0,0 +1,161 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+var MockFilePicker = SpecialPowers.MockFilePicker;
+
+function createTemporarySaveDirectory() {
+  var saveDir = Services.dirsvc.get("TmpD", Ci.nsIFile);
+  saveDir.append("testsavedir");
+  if (!saveDir.exists()) {
+    info("create testsavedir!");
+    saveDir.create(Ci.nsIFile.DIRECTORY_TYPE, 0o755);
+  }
+  info("return from createTempSaveDir: " + saveDir.path);
+  return saveDir;
+}
+
+// Create the folder the certificates will be saved into.
+var destDir = createTemporarySaveDirectory();
+registerCleanupFunction(function () {
+  destDir.remove(true);
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+function stringOrArrayEquals(actual, expected, message) {
+  is(
+    typeof actual,
+    typeof expected,
+    "actual, expected should have the same type"
+  );
+  if (typeof expected == "string") {
+    is(actual, expected, message);
+  } else {
+    is(actual.toString(), expected.toString(), message);
+  }
+}
+
+var dialogWin;
+var exportButton;
+var expectedCert;
+
+async function setupTest() {
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  let certButton = gBrowser.selectedBrowser.contentDocument.getElementById(
+    "viewCertificatesButton"
+  );
+  certButton.scrollIntoView();
+  let certDialogLoaded = promiseLoadSubDialog(
+    "chrome://pippki/content/certManager.xhtml"
+  );
+  certButton.click();
+  dialogWin = await certDialogLoaded;
+  let doc = dialogWin.document;
+  doc.getElementById("certmanagertabs").selectedTab =
+    doc.getElementById("ca_tab");
+  let treeView = doc.getElementById("ca-tree").view;
+  // Select any which cert. Ignore parent rows (ie rows without certs):
+  for (let i = 0; i < treeView.rowCount; i++) {
+    treeView.selection.select(i);
+    dialogWin.getSelectedCerts();
+    let certs = dialogWin.selected_certs; // yuck... but this is how the dialog works.
+    if (certs && certs.length == 1 && certs[0]) {
+      expectedCert = certs[0];
+      // OK, we managed to select a cert!
+      break;
+    }
+  }
+
+  exportButton = doc.getElementById("ca_exportButton");
+  is(exportButton.disabled, false, "Should enable export button");
+}
+
+async function checkCertExportWorks(
+  exportType,
+  encoding,
+  expectedFileContents
+) {
+  MockFilePicker.displayDirectory = destDir;
+  var destFile = destDir.clone();
+  MockFilePicker.init(window);
+  MockFilePicker.filterIndex = exportType;
+  MockFilePicker.showCallback = function (fp) {
+    info("showCallback");
+    let fileName = fp.defaultString;
+    info("fileName: " + fileName);
+    destFile.append(fileName);
+    MockFilePicker.setFiles([destFile]);
+    info("done showCallback");
+  };
+  let finishedExporting = TestUtils.topicObserved("cert-export-finished");
+  exportButton.click();
+  await finishedExporting;
+  MockFilePicker.cleanup();
+  if (destFile && destFile.exists()) {
+    let contents;
+    if (encoding === "utf-8") {
+      contents = await IOUtils.readUTF8(destFile.path);
+    } else {
+      is(encoding, "", "expected either utf-8 or empty string for encoding");
+      contents = await IOUtils.read(destFile.path);
+    }
+    stringOrArrayEquals(
+      contents,
+      expectedFileContents,
+      "Should have written correct contents"
+    );
+    destFile.remove(false);
+  } else {
+    ok(false, "No cert saved!");
+  }
+}
+
+add_task(setupTest);
+
+add_task(async function checkCertPEMExportWorks() {
+  let expectedContents = dialogWin.getPEMString(expectedCert);
+  await checkCertExportWorks(0, /* 0 = PEM */ "utf-8", expectedContents);
+});
+
+add_task(async function checkCertPEMChainExportWorks() {
+  let expectedContents = dialogWin.getPEMString(expectedCert);
+  await checkCertExportWorks(
+    1, // 1 = PEM chain, but the chain is of length 1
+    "utf-8",
+    expectedContents
+  );
+});
+
+add_task(async function checkCertDERExportWorks() {
+  let expectedContents = Uint8Array.from(expectedCert.getRawDER());
+  await checkCertExportWorks(2, /* 2 = DER */ "", expectedContents);
+});
+
+function stringToTypedArray(str) {
+  let arr = new Uint8Array(str.length);
+  for (let i = 0; i < arr.length; i++) {
+    arr[i] = str.charCodeAt(i);
+  }
+  return arr;
+}
+
+add_task(async function checkCertPKCS7ExportWorks() {
+  let certdb = Cc["@mozilla.org/security/x509certdb;1"].getService(
+    Ci.nsIX509CertDB
+  );
+  let expectedContents = stringToTypedArray(certdb.asPKCS7Blob([expectedCert]));
+  await checkCertExportWorks(3, /* 3 = PKCS7 */ "", expectedContents);
+});
+
+add_task(async function checkCertPKCS7ChainExportWorks() {
+  let certdb = Cc["@mozilla.org/security/x509certdb;1"].getService(
+    Ci.nsIX509CertDB
+  );
+  let expectedContents = stringToTypedArray(certdb.asPKCS7Blob([expectedCert]));
+  await checkCertExportWorks(
+    4, // 4 = PKCS7 chain, but the chain is of length 1
+    "",
+    expectedContents
+  );
+});
diff --git a/browser/components/preferences/tests/browser_change_app_handler.js b/browser/components/preferences/tests/browser_change_app_handler.js
new file mode 100644
index 0000000000..b4ca92592f
--- /dev/null
+++ b/browser/components/preferences/tests/browser_change_app_handler.js
@@ -0,0 +1,155 @@
+var gMimeSvc = Cc["@mozilla.org/mime;1"].getService(Ci.nsIMIMEService);
+var gHandlerSvc = Cc["@mozilla.org/uriloader/handler-service;1"].getService(
+  Ci.nsIHandlerService
+);
+
+SimpleTest.requestCompleteLog();
+
+function setupFakeHandler() {
+  let info = gMimeSvc.getFromTypeAndExtension("text/plain", "foo.txt");
+  ok(
+    info.possibleLocalHandlers.length,
+    "Should have at least one known handler"
+  );
+  let handler = info.possibleLocalHandlers.queryElementAt(
+    0,
+    Ci.nsILocalHandlerApp
+  );
+
+  let infoToModify = gMimeSvc.getFromTypeAndExtension(
+    "text/x-test-handler",
+    null
+  );
+  infoToModify.possibleApplicationHandlers.appendElement(handler);
+
+  gHandlerSvc.store(infoToModify);
+}
+
+add_task(async function () {
+  setupFakeHandler();
+
+  let prefs = await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneGeneral", "General pane was selected");
+  let win = gBrowser.selectedBrowser.contentWindow;
+
+  let container = win.document.getElementById("handlersView");
+  let ourItem = container.querySelector(
+    "richlistitem[type='text/x-test-handler']"
+  );
+  ok(ourItem, "handlersView is present");
+  ourItem.scrollIntoView();
+  container.selectItem(ourItem);
+  ok(ourItem.selected, "Should be able to select our item.");
+
+  let list = ourItem.querySelector(".actionsMenu");
+
+  let chooseItem = list.menupopup.querySelector(".choose-app-item");
+  let dialogLoadedPromise = promiseLoadSubDialog(
+    "chrome://global/content/appPicker.xhtml"
+  );
+  let cmdEvent = win.document.createEvent("xulcommandevent");
+  cmdEvent.initCommandEvent(
+    "command",
+    true,
+    true,
+    win,
+    0,
+    false,
+    false,
+    false,
+    false,
+    0,
+    null,
+    0
+  );
+  chooseItem.dispatchEvent(cmdEvent);
+
+  let dialog = await dialogLoadedPromise;
+  info("Dialog loaded");
+
+  let dialogDoc = dialog.document;
+  let dialogElement = dialogDoc.getElementById("app-picker");
+  let dialogList = dialogDoc.getElementById("app-picker-listbox");
+  dialogList.selectItem(dialogList.firstElementChild);
+  let selectedApp = dialogList.firstElementChild.handlerApp;
+  dialogElement.acceptDialog();
+
+  // Verify results are correct in mime service:
+  let mimeInfo = gMimeSvc.getFromTypeAndExtension("text/x-test-handler", null);
+  ok(
+    mimeInfo.preferredApplicationHandler.equals(selectedApp),
+    "App should be set as preferred."
+  );
+
+  // Check that we display this result:
+  ok(list.selectedItem, "Should have a selected item");
+  ok(
+    mimeInfo.preferredApplicationHandler.equals(list.selectedItem.handlerApp),
+    "App should be visible as preferred item."
+  );
+
+  // Now try to 'manage' this list:
+  dialogLoadedPromise = promiseLoadSubDialog(
+    "chrome://browser/content/preferences/dialogs/applicationManager.xhtml"
+  );
+
+  let manageItem = list.menupopup.querySelector(".manage-app-item");
+  cmdEvent = win.document.createEvent("xulcommandevent");
+  cmdEvent.initCommandEvent(
+    "command",
+    true,
+    true,
+    win,
+    0,
+    false,
+    false,
+    false,
+    false,
+    0,
+    null,
+    0
+  );
+  manageItem.dispatchEvent(cmdEvent);
+
+  dialog = await dialogLoadedPromise;
+  info("Dialog loaded the second time");
+
+  dialogDoc = dialog.document;
+  dialogElement = dialogDoc.getElementById("appManager");
+  dialogList = dialogDoc.getElementById("appList");
+  let itemToRemove = dialogList.querySelector(
+    'richlistitem > label[value="' + selectedApp.name + '"]'
+  ).parentNode;
+  dialogList.selectItem(itemToRemove);
+  let itemsBefore = dialogList.children.length;
+  dialogDoc.getElementById("remove").click();
+  ok(!itemToRemove.parentNode, "Item got removed from DOM");
+  is(dialogList.children.length, itemsBefore - 1, "Item got removed");
+  dialogElement.acceptDialog();
+
+  // Verify results are correct in mime service:
+  mimeInfo = gMimeSvc.getFromTypeAndExtension("text/x-test-handler", null);
+  ok(
+    !mimeInfo.preferredApplicationHandler,
+    "App should no longer be set as preferred."
+  );
+
+  // Check that we display this result:
+  ok(list.selectedItem, "Should have a selected item");
+  ok(
+    !list.selectedItem.handlerApp,
+    "No app should be visible as preferred item."
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+registerCleanupFunction(function () {
+  let infoToModify = gMimeSvc.getFromTypeAndExtension(
+    "text/x-test-handler",
+    null
+  );
+  gHandlerSvc.remove(infoToModify);
+});
diff --git a/browser/components/preferences/tests/browser_checkspelling.js b/browser/components/preferences/tests/browser_checkspelling.js
new file mode 100644
index 0000000000..a7895b4201
--- /dev/null
+++ b/browser/components/preferences/tests/browser_checkspelling.js
@@ -0,0 +1,34 @@
+add_task(async function () {
+  SpecialPowers.pushPrefEnv({ set: [["layout.spellcheckDefault", 2]] });
+
+  let prefs = await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneGeneral", "General pane was selected");
+
+  let doc = gBrowser.contentDocument;
+  let checkbox = doc.querySelector("#checkSpelling");
+  is(
+    checkbox.checked,
+    Services.prefs.getIntPref("layout.spellcheckDefault") == 2,
+    "checkbox should represent pref value before clicking on checkbox"
+  );
+  ok(
+    checkbox.checked,
+    "checkbox should be checked before clicking on checkbox"
+  );
+
+  checkbox.click();
+
+  is(
+    checkbox.checked,
+    Services.prefs.getIntPref("layout.spellcheckDefault") == 2,
+    "checkbox should represent pref value after clicking on checkbox"
+  );
+  ok(
+    !checkbox.checked,
+    "checkbox should not be checked after clicking on checkbox"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_connection.js b/browser/components/preferences/tests/browser_connection.js
new file mode 100644
index 0000000000..01cdf571f2
--- /dev/null
+++ b/browser/components/preferences/tests/browser_connection.js
@@ -0,0 +1,145 @@
+/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+function test() {
+  waitForExplicitFinish();
+
+  // network.proxy.type needs to be backed up and restored because mochitest
+  // changes this setting from the default
+  let oldNetworkProxyType = Services.prefs.getIntPref("network.proxy.type");
+  registerCleanupFunction(function () {
+    Services.prefs.setIntPref("network.proxy.type", oldNetworkProxyType);
+    Services.prefs.clearUserPref("network.proxy.no_proxies_on");
+    // On accepting the dialog, we also write TRR values, so we need to clear
+    // them. They are tested separately in browser_privacy_dnsoverhttps.js.
+    Services.prefs.clearUserPref("network.trr.mode");
+    Services.prefs.clearUserPref("network.trr.uri");
+  });
+
+  let connectionURL =
+    "chrome://browser/content/preferences/dialogs/connection.xhtml";
+
+  /*
+  The connection dialog alone won't save onaccept since it uses type="child",
+  so it has to be opened as a sub dialog of the main pref tab.
+  Open the main tab here.
+  */
+  open_preferences(async function tabOpened(aContentWindow) {
+    is(
+      gBrowser.currentURI.spec,
+      "about:preferences",
+      "about:preferences loaded"
+    );
+    let dialog = await openAndLoadSubDialog(connectionURL);
+    let dialogElement = dialog.document.getElementById("ConnectionsDialog");
+    let dialogClosingPromise = BrowserTestUtils.waitForEvent(
+      dialogElement,
+      "dialogclosing"
+    );
+
+    ok(dialog, "connection window opened");
+    runConnectionTests(dialog);
+    dialogElement.acceptDialog();
+
+    let dialogClosingEvent = await dialogClosingPromise;
+    ok(dialogClosingEvent, "connection window closed");
+    // runConnectionTests will have changed this pref - make sure it was
+    // sanitized correctly when the dialog was accepted
+    is(
+      Services.prefs.getCharPref("network.proxy.no_proxies_on"),
+      ".a.com,.b.com,.c.com",
+      "no_proxies_on pref has correct value"
+    );
+    gBrowser.removeCurrentTab();
+    finish();
+  });
+}
+
+// run a bunch of tests on the window containing connection.xul
+function runConnectionTests(win) {
+  let doc = win.document;
+  let networkProxyNone = doc.getElementById("networkProxyNone");
+  let networkProxyNonePref = win.Preferences.get("network.proxy.no_proxies_on");
+  let networkProxyTypePref = win.Preferences.get("network.proxy.type");
+
+  // make sure the networkProxyNone textbox is formatted properly
+  is(networkProxyNone.localName, "textarea", "networkProxyNone is a textarea");
+  is(
+    networkProxyNone.getAttribute("rows"),
+    "2",
+    "networkProxyNone textbox has two rows"
+  );
+
+  // make sure manual proxy controls are disabled when the window is opened
+  let networkProxyHTTP = doc.getElementById("networkProxyHTTP");
+  is(networkProxyHTTP.disabled, true, "networkProxyHTTP textbox is disabled");
+
+  // check if sanitizing the given input for the no_proxies_on pref results in
+  // expected string
+  function testSanitize(input, expected, errorMessage) {
+    networkProxyNonePref.value = input;
+    win.gConnectionsDialog.sanitizeNoProxiesPref();
+    is(networkProxyNonePref.value, expected, errorMessage);
+  }
+
+  // change this pref so proxy exceptions are actually configurable
+  networkProxyTypePref.value = 1;
+  is(networkProxyNone.disabled, false, "networkProxyNone textbox is enabled");
+
+  testSanitize(".a.com", ".a.com", "sanitize doesn't mess up single filter");
+  testSanitize(
+    ".a.com, .b.com, .c.com",
+    ".a.com, .b.com, .c.com",
+    "sanitize doesn't mess up multiple comma/space sep filters"
+  );
+  testSanitize(
+    ".a.com\n.b.com",
+    ".a.com,.b.com",
+    "sanitize turns line break into comma"
+  );
+  testSanitize(
+    ".a.com,\n.b.com",
+    ".a.com,.b.com",
+    "sanitize doesn't add duplicate comma after comma"
+  );
+  testSanitize(
+    ".a.com\n,.b.com",
+    ".a.com,.b.com",
+    "sanitize doesn't add duplicate comma before comma"
+  );
+  testSanitize(
+    ".a.com,\n,.b.com",
+    ".a.com,,.b.com",
+    "sanitize doesn't add duplicate comma surrounded by commas"
+  );
+  testSanitize(
+    ".a.com, \n.b.com",
+    ".a.com, .b.com",
+    "sanitize doesn't add comma after comma/space"
+  );
+  testSanitize(
+    ".a.com\n .b.com",
+    ".a.com, .b.com",
+    "sanitize adds comma before space"
+  );
+  testSanitize(
+    ".a.com\n\n\n;;\n;\n.b.com",
+    ".a.com,.b.com",
+    "sanitize only adds one comma per substring of bad chars"
+  );
+  testSanitize(
+    ".a.com,,.b.com",
+    ".a.com,,.b.com",
+    "duplicate commas from user are untouched"
+  );
+  testSanitize(
+    ".a.com\n.b.com\n.c.com,\n.d.com,\n.e.com",
+    ".a.com,.b.com,.c.com,.d.com,.e.com",
+    "sanitize replaces things globally"
+  );
+
+  // will check that this was sanitized properly after window closes
+  networkProxyNonePref.value = ".a.com;.b.com\n.c.com";
+}
diff --git a/browser/components/preferences/tests/browser_connection_bug1445991.js b/browser/components/preferences/tests/browser_connection_bug1445991.js
new file mode 100644
index 0000000000..ecb5068a26
--- /dev/null
+++ b/browser/components/preferences/tests/browser_connection_bug1445991.js
@@ -0,0 +1,31 @@
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test the disabled status of the autoconfig Reload button when the proxy type
+// is autoconfig (network.proxy.type == 2).
+add_task(async function testAutoconfigReloadButton() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["network.proxy.type", 2],
+      ["network.proxy.autoconfig_url", "file:///nonexistent.pac"],
+    ],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("general", { leaveOpen: true });
+  const connectionURL =
+    "chrome://browser/content/preferences/dialogs/connection.xhtml";
+  const promiseDialogLoaded = promiseLoadSubDialog(connectionURL);
+  gBrowser.contentDocument.getElementById("connectionSettings").click();
+  const dialog = await promiseDialogLoaded;
+
+  ok(
+    !dialog.document.getElementById("autoReload").disabled,
+    "Reload button is enabled when proxy type is autoconfig"
+  );
+
+  dialog.close();
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_connection_bug1505330.js b/browser/components/preferences/tests/browser_connection_bug1505330.js
new file mode 100644
index 0000000000..94dfd4706e
--- /dev/null
+++ b/browser/components/preferences/tests/browser_connection_bug1505330.js
@@ -0,0 +1,31 @@
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test the disabled status of the autoconfig Reload button when the proxy type
+// is autoconfig (network.proxy.type == 2).
+add_task(async function testAutoconfigReloadButton() {
+  Services.prefs.lockPref("signon.autologin.proxy");
+
+  await openPreferencesViaOpenPreferencesAPI("general", { leaveOpen: true });
+  const connectionURL =
+    "chrome://browser/content/preferences/dialogs/connection.xhtml";
+  const promiseDialogLoaded = promiseLoadSubDialog(connectionURL);
+  gBrowser.contentDocument.getElementById("connectionSettings").click();
+  const dialog = await promiseDialogLoaded;
+
+  ok(
+    !dialog.document.getElementById("networkProxyType").firstChild.disabled,
+    "Connection options should not be disabled"
+  );
+  ok(
+    dialog.document.getElementById("autologinProxy").disabled,
+    "Proxy autologin should be disabled"
+  );
+
+  dialog.close();
+  Services.prefs.unlockPref("signon.autologin.proxy");
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_connection_bug388287.js b/browser/components/preferences/tests/browser_connection_bug388287.js
new file mode 100644
index 0000000000..d6f0c3c9d0
--- /dev/null
+++ b/browser/components/preferences/tests/browser_connection_bug388287.js
@@ -0,0 +1,124 @@
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  waitForExplicitFinish();
+  const connectionURL =
+    "chrome://browser/content/preferences/dialogs/connection.xhtml";
+  let closeable = false;
+  let finalTest = false;
+
+  // The changed preferences need to be backed up and restored because this mochitest
+  // changes them setting from the default
+  let oldNetworkProxyType = Services.prefs.getIntPref("network.proxy.type");
+  registerCleanupFunction(function () {
+    Services.prefs.setIntPref("network.proxy.type", oldNetworkProxyType);
+    Services.prefs.clearUserPref("network.proxy.share_proxy_settings");
+    for (let proxyType of ["http", "ssl", "socks"]) {
+      Services.prefs.clearUserPref("network.proxy." + proxyType);
+      Services.prefs.clearUserPref("network.proxy." + proxyType + "_port");
+      if (proxyType == "http") {
+        continue;
+      }
+      Services.prefs.clearUserPref("network.proxy.backup." + proxyType);
+      Services.prefs.clearUserPref(
+        "network.proxy.backup." + proxyType + "_port"
+      );
+    }
+    // On accepting the dialog, we also write TRR values, so we need to clear
+    // them. They are tested separately in browser_privacy_dnsoverhttps.js.
+    Services.prefs.clearUserPref("network.trr.mode");
+    Services.prefs.clearUserPref("network.trr.uri");
+  });
+
+  /*
+   The connection dialog alone won't save onaccept since it uses type="child",
+   so it has to be opened as a sub dialog of the main pref tab.
+   Open the main tab here.
+   */
+  open_preferences(async function tabOpened(aContentWindow) {
+    let dialog, dialogClosingPromise, dialogElement;
+    let proxyTypePref, sharePref, httpPref, httpPortPref;
+
+    // Convenient function to reset the variables for the new window
+    async function setDoc() {
+      if (closeable) {
+        let dialogClosingEvent = await dialogClosingPromise;
+        ok(dialogClosingEvent, "Connection dialog closed");
+      }
+
+      if (finalTest) {
+        gBrowser.removeCurrentTab();
+        finish();
+        return;
+      }
+
+      dialog = await openAndLoadSubDialog(connectionURL);
+      dialogElement = dialog.document.getElementById("ConnectionsDialog");
+      dialogClosingPromise = BrowserTestUtils.waitForEvent(
+        dialogElement,
+        "dialogclosing"
+      );
+
+      proxyTypePref = dialog.Preferences.get("network.proxy.type");
+      sharePref = dialog.Preferences.get("network.proxy.share_proxy_settings");
+      httpPref = dialog.Preferences.get("network.proxy.http");
+      httpPortPref = dialog.Preferences.get("network.proxy.http_port");
+    }
+
+    // This batch of tests should not close the dialog
+    await setDoc();
+
+    // Testing HTTP port 0 with share on
+    proxyTypePref.value = 1;
+    sharePref.value = true;
+    httpPref.value = "localhost";
+    httpPortPref.value = 0;
+    dialogElement.acceptDialog();
+
+    // Testing HTTP port 0 + FTP port 80 with share off
+    sharePref.value = false;
+    dialogElement.acceptDialog();
+
+    // Testing HTTP port 80 + FTP port 0 with share off
+    httpPortPref.value = 80;
+    dialogElement.acceptDialog();
+
+    // From now on, the dialog should close since we are giving it legitimate inputs.
+    // The test will timeout if the onbeforeaccept kicks in erroneously.
+    closeable = true;
+
+    // Both ports 80, share on
+    httpPortPref.value = 80;
+    dialogElement.acceptDialog();
+
+    // HTTP 80, FTP 0, with share on
+    await setDoc();
+    proxyTypePref.value = 1;
+    sharePref.value = true;
+    httpPref.value = "localhost";
+    httpPortPref.value = 80;
+    dialogElement.acceptDialog();
+
+    // HTTP host empty, port 0 with share on
+    await setDoc();
+    proxyTypePref.value = 1;
+    sharePref.value = true;
+    httpPref.value = "";
+    httpPortPref.value = 0;
+    dialogElement.acceptDialog();
+
+    // HTTP 0, but in no proxy mode
+    await setDoc();
+    proxyTypePref.value = 0;
+    sharePref.value = true;
+    httpPref.value = "localhost";
+    httpPortPref.value = 0;
+
+    // This is the final test, don't spawn another connection window
+    finalTest = true;
+    dialogElement.acceptDialog();
+    await setDoc();
+  });
+}
diff --git a/browser/components/preferences/tests/browser_connection_valid_hostname.js b/browser/components/preferences/tests/browser_connection_valid_hostname.js
new file mode 100644
index 0000000000..2e22122448
--- /dev/null
+++ b/browser/components/preferences/tests/browser_connection_valid_hostname.js
@@ -0,0 +1,55 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_valid_hostname() {
+  await openPreferencesViaOpenPreferencesAPI("general", { leaveOpen: true });
+  const connectionURL =
+    "chrome://browser/content/preferences/dialogs/connection.xhtml";
+  let dialog = await openAndLoadSubDialog(connectionURL);
+  let dialogElement = dialog.document.getElementById("ConnectionsDialog");
+
+  let oldNetworkProxyType = Services.prefs.getIntPref("network.proxy.type");
+  registerCleanupFunction(function () {
+    Services.prefs.setIntPref("network.proxy.type", oldNetworkProxyType);
+    Services.prefs.clearUserPref("network.proxy.share_proxy_settings");
+    for (let proxyType of ["http", "ssl", "socks"]) {
+      Services.prefs.clearUserPref("network.proxy." + proxyType);
+      Services.prefs.clearUserPref("network.proxy." + proxyType + "_port");
+      if (proxyType == "http") {
+        continue;
+      }
+      Services.prefs.clearUserPref("network.proxy.backup." + proxyType);
+      Services.prefs.clearUserPref(
+        "network.proxy.backup." + proxyType + "_port"
+      );
+    }
+  });
+
+  let proxyType = dialog.Preferences.get("network.proxy.type");
+  let httpPref = dialog.Preferences.get("network.proxy.http");
+  let httpPortPref = dialog.Preferences.get("network.proxy.http_port");
+  proxyType.value = 1;
+  httpPortPref.value = 1234;
+
+  httpPref.value = "bad://hostname";
+  let beforeAcceptCalled = BrowserTestUtils.waitForEvent(
+    dialogElement,
+    "beforeaccept"
+  );
+  dialogElement.acceptDialog();
+  let event = await beforeAcceptCalled;
+  Assert.ok(event.defaultPrevented, "The dialog was not accepted");
+
+  httpPref.value = "goodhostname";
+  beforeAcceptCalled = BrowserTestUtils.waitForEvent(
+    dialogElement,
+    "beforeaccept"
+  );
+  dialogElement.acceptDialog();
+  event = await beforeAcceptCalled;
+  Assert.ok(!event.defaultPrevented, "The dialog was accepted");
+
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_containers_name_input.js b/browser/components/preferences/tests/browser_containers_name_input.js
new file mode 100644
index 0000000000..38785d3cb0
--- /dev/null
+++ b/browser/components/preferences/tests/browser_containers_name_input.js
@@ -0,0 +1,72 @@
+const CONTAINERS_URL =
+  "chrome://browser/content/preferences/dialogs/containers.xhtml";
+
+add_setup(async function () {
+  await openPreferencesViaOpenPreferencesAPI("containers", { leaveOpen: true });
+  registerCleanupFunction(async function () {
+    BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  });
+});
+
+add_task(async function () {
+  async function openDialog() {
+    let doc = gBrowser.selectedBrowser.contentDocument;
+
+    let dialogPromise = promiseLoadSubDialog(CONTAINERS_URL);
+
+    let addButton = doc.getElementById("containersAdd");
+    addButton.doCommand();
+
+    let dialog = await dialogPromise;
+
+    return dialog.document;
+  }
+
+  let { contentDocument } = gBrowser.selectedBrowser;
+  let containerNodes = Array.from(
+    contentDocument.querySelectorAll("[data-category=paneContainers]")
+  );
+  ok(
+    containerNodes.find(node => node.getBoundingClientRect().width > 0),
+    "Should actually be showing the container nodes."
+  );
+
+  let doc = await openDialog();
+
+  let name = doc.getElementById("name");
+  let btnApplyChanges = doc.querySelector("dialog").getButton("accept");
+
+  Assert.equal(name.value, "", "The name textbox should initlally be empty");
+  Assert.ok(
+    btnApplyChanges.disabled,
+    "The done button should initially be disabled"
+  );
+
+  function setName(value) {
+    name.value = value;
+
+    let event = new doc.defaultView.InputEvent("input", { data: value });
+    SpecialPowers.dispatchEvent(doc.defaultView, name, event);
+  }
+
+  setName("test");
+
+  Assert.ok(
+    !btnApplyChanges.disabled,
+    "The done button should be enabled when the value is not empty"
+  );
+
+  setName("");
+
+  Assert.ok(
+    btnApplyChanges.disabled,
+    "The done button should be disabled when the value is empty"
+  );
+
+  setName("\u0009\u000B\u000C\u0020\u00A0\uFEFF\u000A\u000D\u2028\u2029");
+
+  Assert.ok(
+    btnApplyChanges.disabled,
+    "The done button should be disabled when the value contains only whitespaces"
+  );
+});
diff --git a/browser/components/preferences/tests/browser_contentblocking.js b/browser/components/preferences/tests/browser_contentblocking.js
new file mode 100644
index 0000000000..3d33f2ed7d
--- /dev/null
+++ b/browser/components/preferences/tests/browser_contentblocking.js
@@ -0,0 +1,1612 @@
+/* eslint-env webextensions */
+
+"use strict";
+
+const { Preferences } = ChromeUtils.importESModule(
+  "resource://gre/modules/Preferences.sys.mjs"
+);
+
+const TP_PREF = "privacy.trackingprotection.enabled";
+const TP_PBM_PREF = "privacy.trackingprotection.pbmode.enabled";
+const NCB_PREF = "network.cookie.cookieBehavior";
+const NCBP_PREF = "network.cookie.cookieBehavior.pbmode";
+const CAT_PREF = "browser.contentblocking.category";
+const FP_PREF = "privacy.trackingprotection.fingerprinting.enabled";
+const STP_PREF = "privacy.trackingprotection.socialtracking.enabled";
+const CM_PREF = "privacy.trackingprotection.cryptomining.enabled";
+const EMAIL_TP_PREF = "privacy.trackingprotection.emailtracking.enabled";
+const EMAIL_TP_PBM_PREF =
+  "privacy.trackingprotection.emailtracking.pbmode.enabled";
+const LEVEL2_PREF = "privacy.annotate_channels.strict_list.enabled";
+const REFERRER_PREF = "network.http.referer.disallowCrossSiteRelaxingDefault";
+const REFERRER_TOP_PREF =
+  "network.http.referer.disallowCrossSiteRelaxingDefault.top_navigation";
+const OCSP_PREF = "privacy.partition.network_state.ocsp_cache";
+const QUERY_PARAM_STRIP_PREF = "privacy.query_stripping.enabled";
+const QUERY_PARAM_STRIP_PBM_PREF = "privacy.query_stripping.enabled.pbmode";
+const PREF_TEST_NOTIFICATIONS =
+  "browser.safebrowsing.test-notifications.enabled";
+const STRICT_PREF = "browser.contentblocking.features.strict";
+const PRIVACY_PAGE = "about:preferences#privacy";
+const ISOLATE_UI_PREF =
+  "browser.contentblocking.reject-and-isolate-cookies.preferences.ui.enabled";
+const FPI_PREF = "privacy.firstparty.isolate";
+const FPP_PREF = "privacy.fingerprintingProtection";
+const FPP_PBM_PREF = "privacy.fingerprintingProtection.pbmode";
+
+const { EnterprisePolicyTesting, PoliciesPrefTracker } =
+  ChromeUtils.importESModule(
+    "resource://testing-common/EnterprisePolicyTesting.sys.mjs"
+  );
+
+requestLongerTimeout(2);
+
+add_task(async function testListUpdate() {
+  SpecialPowers.pushPrefEnv({ set: [[PREF_TEST_NOTIFICATIONS, true]] });
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  let doc = gBrowser.contentDocument;
+
+  let fingerprintersCheckbox = doc.getElementById(
+    "contentBlockingFingerprintersCheckbox"
+  );
+  let updateObserved = TestUtils.topicObserved("safebrowsing-update-attempt");
+  fingerprintersCheckbox.click();
+  let url = (await updateObserved)[1];
+
+  ok(true, "Has tried to update after the fingerprinting checkbox was toggled");
+  is(
+    url,
+    "http://127.0.0.1:8888/safebrowsing-dummy/update",
+    "Using the correct list url to update"
+  );
+
+  let cryptominersCheckbox = doc.getElementById(
+    "contentBlockingCryptominersCheckbox"
+  );
+  updateObserved = TestUtils.topicObserved("safebrowsing-update-attempt");
+  cryptominersCheckbox.click();
+  url = (await updateObserved)[1];
+
+  ok(true, "Has tried to update after the cryptomining checkbox was toggled");
+  is(
+    url,
+    "http://127.0.0.1:8888/safebrowsing-dummy/update",
+    "Using the correct list url to update"
+  );
+
+  gBrowser.removeCurrentTab();
+});
+
+// Tests that the content blocking main category checkboxes have the correct default state.
+add_task(async function testContentBlockingMainCategory() {
+  let prefs = [
+    [TP_PREF, false],
+    [TP_PBM_PREF, true],
+    [STP_PREF, false],
+    [NCB_PREF, Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER],
+    [
+      NCBP_PREF,
+      Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN,
+    ],
+    [ISOLATE_UI_PREF, true],
+    [FPI_PREF, false],
+    [FPP_PREF, false],
+    [FPP_PBM_PREF, true],
+  ];
+
+  for (let pref of prefs) {
+    switch (typeof pref[1]) {
+      case "boolean":
+        SpecialPowers.setBoolPref(pref[0], pref[1]);
+        break;
+      case "number":
+        SpecialPowers.setIntPref(pref[0], pref[1]);
+        break;
+    }
+  }
+
+  let checkboxes = [
+    "#contentBlockingTrackingProtectionCheckbox",
+    "#contentBlockingBlockCookiesCheckbox",
+    "#contentBlockingFingerprintingProtectionCheckbox",
+  ];
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  let doc = gBrowser.contentDocument;
+
+  for (let selector of checkboxes) {
+    let element = doc.querySelector(selector);
+    ok(element, "checkbox " + selector + " exists");
+    is(
+      element.getAttribute("checked"),
+      "true",
+      "checkbox " + selector + " is checked"
+    );
+  }
+
+  // Ensure the dependent controls of the tracking protection subsection behave properly.
+  let tpCheckbox = doc.querySelector(checkboxes[0]);
+
+  let dependentControls = ["#trackingProtectionMenu"];
+  let alwaysEnabledControls = [
+    "#trackingProtectionMenuDesc",
+    ".content-blocking-category-name",
+    "#changeBlockListLink",
+  ];
+
+  tpCheckbox.checked = true;
+
+  // Select "Always" under "All Detected Trackers".
+  let menu = doc.querySelector("#trackingProtectionMenu");
+  let always = doc.querySelector(
+    "#trackingProtectionMenu > menupopup > menuitem[value=always]"
+  );
+  let privateElement = doc.querySelector(
+    "#trackingProtectionMenu > menupopup > menuitem[value=private]"
+  );
+  menu.selectedItem = always;
+  ok(
+    !privateElement.selected,
+    "The Only in private windows item should not be selected"
+  );
+  ok(always.selected, "The Always item should be selected");
+
+  // The first time, privacy-pane-tp-ui-updated won't be dispatched since the
+  // assignment above is a no-op.
+
+  // Ensure the dependent controls are enabled
+  checkControlState(doc, dependentControls, true);
+  checkControlState(doc, alwaysEnabledControls, true);
+
+  let promise = TestUtils.topicObserved("privacy-pane-tp-ui-updated");
+  tpCheckbox.click();
+
+  await promise;
+  ok(!tpCheckbox.checked, "The checkbox should now be unchecked");
+
+  // Ensure the dependent controls are disabled
+  checkControlState(doc, dependentControls, false);
+  checkControlState(doc, alwaysEnabledControls, true);
+
+  // Make sure the selection in the tracking protection submenu persists after
+  // a few times of checking and unchecking All Detected Trackers.
+  // Doing this in a loop in order to avoid typing in the unrolled version manually.
+  // We need to go from the checked state of the checkbox to unchecked back to
+  // checked again...
+  for (let i = 0; i < 3; ++i) {
+    promise = TestUtils.topicObserved("privacy-pane-tp-ui-updated");
+    tpCheckbox.click();
+
+    await promise;
+    is(tpCheckbox.checked, i % 2 == 0, "The checkbox should now be unchecked");
+    is(
+      privateElement.selected,
+      i % 2 == 0,
+      "The Only in private windows item should be selected by default, when the checkbox is checked"
+    );
+    ok(!always.selected, "The Always item should no longer be selected");
+  }
+
+  let cookieMenu = doc.querySelector("#blockCookiesMenu");
+  let cookieMenuTrackers = cookieMenu.querySelector(
+    "menupopup > menuitem[value=trackers]"
+  );
+  let cookieMenuTrackersPlusIsolate = cookieMenu.querySelector(
+    "menupopup > menuitem[value=trackers-plus-isolate]"
+  );
+  let cookieMenuUnvisited = cookieMenu.querySelector(
+    "menupopup > menuitem[value=unvisited]"
+  );
+  let cookieMenuAllThirdParties = doc.querySelector(
+    "menupopup > menuitem[value=all-third-parties]"
+  );
+  let cookieMenuAll = cookieMenu.querySelector(
+    "menupopup > menuitem[value=always]"
+  );
+  // Select block trackers
+  cookieMenuTrackers.click();
+  ok(cookieMenuTrackers.selected, "The trackers item should be selected");
+  is(
+    Services.prefs.getIntPref(NCB_PREF),
+    Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER,
+    `${NCB_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER}`
+  );
+  is(
+    Services.prefs.getIntPref(NCBP_PREF),
+    Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN,
+    `${NCBP_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN}`
+  );
+  // Select block trackers and isolate
+  cookieMenuTrackersPlusIsolate.click();
+  ok(
+    cookieMenuTrackersPlusIsolate.selected,
+    "The trackers plus isolate item should be selected"
+  );
+  is(
+    Services.prefs.getIntPref(NCB_PREF),
+    Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN,
+    `${NCB_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN}`
+  );
+  is(
+    Services.prefs.getIntPref(NCBP_PREF),
+    Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN,
+    `${NCBP_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN}`
+  );
+  // Select block unvisited
+  cookieMenuUnvisited.click();
+  ok(cookieMenuUnvisited.selected, "The unvisited item should be selected");
+  is(
+    Services.prefs.getIntPref(NCB_PREF),
+    Ci.nsICookieService.BEHAVIOR_LIMIT_FOREIGN,
+    `${NCB_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_LIMIT_FOREIGN}`
+  );
+  is(
+    Services.prefs.getIntPref(NCBP_PREF),
+    Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN,
+    `${NCBP_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN}`
+  );
+  // Select block all third party
+  cookieMenuAllThirdParties.click();
+  ok(
+    cookieMenuAllThirdParties.selected,
+    "The all-third-parties item should be selected"
+  );
+  is(
+    Services.prefs.getIntPref(NCB_PREF),
+    Ci.nsICookieService.BEHAVIOR_REJECT_FOREIGN,
+    `${NCB_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_REJECT_FOREIGN}`
+  );
+  is(
+    Services.prefs.getIntPref(NCBP_PREF),
+    Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN,
+    `${NCBP_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN}`
+  );
+  // Select block all third party
+  cookieMenuAll.click();
+  ok(cookieMenuAll.selected, "The all cookies item should be selected");
+  is(
+    Services.prefs.getIntPref(NCB_PREF),
+    Ci.nsICookieService.BEHAVIOR_REJECT,
+    `${NCB_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_REJECT}`
+  );
+  is(
+    Services.prefs.getIntPref(NCBP_PREF),
+    Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN,
+    `${NCBP_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN}`
+  );
+
+  gBrowser.removeCurrentTab();
+
+  // Ensure the block-trackers-plus-isolate option only shows in the dropdown if the UI pref is set.
+  Services.prefs.setBoolPref(ISOLATE_UI_PREF, false);
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  doc = gBrowser.contentDocument;
+  cookieMenuTrackersPlusIsolate = doc.querySelector(
+    "#blockCookiesMenu menupopup > menuitem[value=trackers-plus-isolate]"
+  );
+  ok(
+    cookieMenuTrackersPlusIsolate.hidden,
+    "Trackers plus isolate option is hidden from the dropdown if the ui pref is not set."
+  );
+
+  gBrowser.removeCurrentTab();
+
+  // Ensure the block-trackers-plus-isolate option only shows in the dropdown if FPI is disabled.
+  SpecialPowers.setIntPref(
+    NCB_PREF,
+    Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN
+  );
+  SpecialPowers.setBoolPref(FPI_PREF, true);
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  doc = gBrowser.contentDocument;
+  cookieMenuTrackers = doc.querySelector(
+    "#blockCookiesMenu menupopup > menuitem[value=trackers]"
+  );
+  cookieMenuTrackersPlusIsolate = doc.querySelector(
+    "#blockCookiesMenu menupopup > menuitem[value=trackers-plus-isolate]"
+  );
+  ok(cookieMenuTrackers.selected, "The trackers item should be selected");
+  ok(
+    cookieMenuTrackersPlusIsolate.hidden,
+    "Trackers plus isolate option is hidden from the dropdown if the FPI pref is set."
+  );
+  gBrowser.removeCurrentTab();
+
+  for (let pref of prefs) {
+    SpecialPowers.clearUserPref(pref[0]);
+  }
+});
+
+// Tests that the content blocking "Standard" category radio sets the prefs to their default values.
+add_task(async function testContentBlockingStandardCategory() {
+  let prefs = {
+    [TP_PREF]: null,
+    [TP_PBM_PREF]: null,
+    [NCB_PREF]: null,
+    [NCBP_PREF]: null,
+    [FP_PREF]: null,
+    [STP_PREF]: null,
+    [CM_PREF]: null,
+    [EMAIL_TP_PREF]: null,
+    [EMAIL_TP_PBM_PREF]: null,
+    [LEVEL2_PREF]: null,
+    [REFERRER_PREF]: null,
+    [REFERRER_TOP_PREF]: null,
+    [OCSP_PREF]: null,
+    [QUERY_PARAM_STRIP_PREF]: null,
+    [QUERY_PARAM_STRIP_PBM_PREF]: null,
+    [FPP_PREF]: null,
+    [FPP_PBM_PREF]: null,
+  };
+
+  for (let pref in prefs) {
+    Services.prefs.clearUserPref(pref);
+    switch (Services.prefs.getPrefType(pref)) {
+      case Services.prefs.PREF_BOOL:
+        prefs[pref] = Services.prefs.getBoolPref(pref);
+        break;
+      case Services.prefs.PREF_INT:
+        prefs[pref] = Services.prefs.getIntPref(pref);
+        break;
+      case Services.prefs.PREF_STRING:
+        prefs[pref] = Services.prefs.getCharPref(pref);
+        break;
+      default:
+        ok(false, `Unknown pref type for ${pref}`);
+    }
+  }
+
+  Services.prefs.setBoolPref(TP_PREF, true);
+  Services.prefs.setBoolPref(TP_PBM_PREF, false);
+  Services.prefs.setIntPref(
+    NCB_PREF,
+    Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER
+  );
+  Services.prefs.setIntPref(
+    NCBP_PREF,
+    Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER
+  );
+  Services.prefs.setBoolPref(STP_PREF, !Services.prefs.getBoolPref(STP_PREF));
+  Services.prefs.setBoolPref(FP_PREF, !Services.prefs.getBoolPref(FP_PREF));
+  Services.prefs.setBoolPref(CM_PREF, !Services.prefs.getBoolPref(CM_PREF));
+  Services.prefs.setBoolPref(
+    EMAIL_TP_PREF,
+    !Services.prefs.getBoolPref(EMAIL_TP_PREF)
+  );
+  Services.prefs.setBoolPref(
+    EMAIL_TP_PBM_PREF,
+    !Services.prefs.getBoolPref(EMAIL_TP_PBM_PREF)
+  );
+  Services.prefs.setBoolPref(
+    LEVEL2_PREF,
+    !Services.prefs.getBoolPref(LEVEL2_PREF)
+  );
+  Services.prefs.setBoolPref(
+    REFERRER_PREF,
+    !Services.prefs.getBoolPref(REFERRER_PREF)
+  );
+  Services.prefs.setBoolPref(
+    REFERRER_TOP_PREF,
+    !Services.prefs.getBoolPref(REFERRER_TOP_PREF)
+  );
+  Services.prefs.setBoolPref(OCSP_PREF, !Services.prefs.getBoolPref(OCSP_PREF));
+  Services.prefs.setBoolPref(
+    QUERY_PARAM_STRIP_PREF,
+    !Services.prefs.getBoolPref(QUERY_PARAM_STRIP_PREF)
+  );
+  Services.prefs.setBoolPref(
+    QUERY_PARAM_STRIP_PBM_PREF,
+    !Services.prefs.getBoolPref(QUERY_PARAM_STRIP_PBM_PREF)
+  );
+  Services.prefs.setBoolPref(FPP_PREF, !Services.prefs.getBoolPref(FPP_PREF));
+  Services.prefs.setBoolPref(
+    FPP_PBM_PREF,
+    !Services.prefs.getBoolPref(FPP_PBM_PREF)
+  );
+
+  for (let pref in prefs) {
+    switch (Services.prefs.getPrefType(pref)) {
+      case Services.prefs.PREF_BOOL:
+        // Account for prefs that may have retained their default value
+        if (Services.prefs.getBoolPref(pref) != prefs[pref]) {
+          ok(
+            Services.prefs.prefHasUserValue(pref),
+            `modified the pref ${pref}`
+          );
+        }
+        break;
+      case Services.prefs.PREF_INT:
+        if (Services.prefs.getIntPref(pref) != prefs[pref]) {
+          ok(
+            Services.prefs.prefHasUserValue(pref),
+            `modified the pref ${pref}`
+          );
+        }
+        break;
+      case Services.prefs.PREF_STRING:
+        if (Services.prefs.getCharPref(pref) != prefs[pref]) {
+          ok(
+            Services.prefs.prefHasUserValue(pref),
+            `modified the pref ${pref}`
+          );
+        }
+        break;
+      default:
+        ok(false, `Unknown pref type for ${pref}`);
+    }
+  }
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  let doc = gBrowser.contentDocument;
+
+  let standardRadioOption = doc.getElementById("standardRadio");
+  standardRadioOption.click();
+
+  // TP prefs are reset async to check for extensions controlling them.
+  await TestUtils.waitForCondition(
+    () => !Services.prefs.prefHasUserValue(TP_PREF)
+  );
+
+  for (let pref in prefs) {
+    ok(!Services.prefs.prefHasUserValue(pref), `reset the pref ${pref}`);
+  }
+  is(
+    Services.prefs.getStringPref(CAT_PREF),
+    "standard",
+    `${CAT_PREF} has been set to standard`
+  );
+
+  gBrowser.removeCurrentTab();
+});
+
+// Tests that the content blocking "Strict" category radio sets the prefs to the expected values.
+add_task(async function testContentBlockingStrictCategory() {
+  Services.prefs.setBoolPref(TP_PREF, false);
+  Services.prefs.setBoolPref(TP_PBM_PREF, false);
+  Services.prefs.setBoolPref(EMAIL_TP_PREF, false);
+  Services.prefs.setBoolPref(EMAIL_TP_PBM_PREF, false);
+  Services.prefs.setBoolPref(LEVEL2_PREF, false);
+  Services.prefs.setBoolPref(REFERRER_PREF, false);
+  Services.prefs.setBoolPref(REFERRER_TOP_PREF, false);
+  Services.prefs.setBoolPref(OCSP_PREF, false);
+  Services.prefs.setBoolPref(QUERY_PARAM_STRIP_PREF, false);
+  Services.prefs.setBoolPref(QUERY_PARAM_STRIP_PBM_PREF, false);
+  Services.prefs.setBoolPref(FPP_PREF, false);
+  Services.prefs.setBoolPref(FPP_PBM_PREF, false);
+  Services.prefs.setIntPref(
+    NCB_PREF,
+    Ci.nsICookieService.BEHAVIOR_LIMIT_FOREIGN
+  );
+  Services.prefs.setIntPref(
+    NCBP_PREF,
+    Ci.nsICookieService.BEHAVIOR_LIMIT_FOREIGN
+  );
+  let strict_pref = Services.prefs.getStringPref(STRICT_PREF).split(",");
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  let doc = gBrowser.contentDocument;
+
+  let strictRadioOption = doc.getElementById("strictRadio");
+  strictRadioOption.click();
+
+  // TP prefs are reset async to check for extensions controlling them.
+  await TestUtils.waitForCondition(
+    () => Services.prefs.getStringPref(CAT_PREF) == "strict"
+  );
+  // Depending on the definition of the STRICT_PREF, the dependant prefs may have been
+  // set to varying values. Ensure they have been set according to this definition.
+  for (let pref of strict_pref) {
+    switch (pref) {
+      case "tp":
+        is(
+          Services.prefs.getBoolPref(TP_PREF),
+          true,
+          `${TP_PREF} has been set to true`
+        );
+        break;
+      case "-tp":
+        is(
+          Services.prefs.getBoolPref(TP_PREF),
+          false,
+          `${TP_PREF} has been set to false`
+        );
+        break;
+      case "tpPrivate":
+        is(
+          Services.prefs.getBoolPref(TP_PBM_PREF),
+          true,
+          `${TP_PBM_PREF} has been set to true`
+        );
+        break;
+      case "-tpPrivate":
+        is(
+          Services.prefs.getBoolPref(TP_PBM_PREF),
+          false,
+          `${TP_PBM_PREF} has been set to false`
+        );
+        break;
+      case "fp":
+        is(
+          Services.prefs.getBoolPref(FP_PREF),
+          true,
+          `${FP_PREF} has been set to true`
+        );
+        break;
+      case "-fp":
+        is(
+          Services.prefs.getBoolPref(FP_PREF),
+          false,
+          `${FP_PREF} has been set to false`
+        );
+        break;
+      case "stp":
+        is(
+          Services.prefs.getBoolPref(STP_PREF),
+          true,
+          `${STP_PREF} has been set to true`
+        );
+        break;
+      case "-stp":
+        is(
+          Services.prefs.getBoolPref(STP_PREF),
+          false,
+          `${STP_PREF} has been set to false`
+        );
+        break;
+      case "cm":
+        is(
+          Services.prefs.getBoolPref(CM_PREF),
+          true,
+          `${CM_PREF} has been set to true`
+        );
+        break;
+      case "-cm":
+        is(
+          Services.prefs.getBoolPref(CM_PREF),
+          false,
+          `${CM_PREF} has been set to false`
+        );
+        break;
+      case "emailTP":
+        is(
+          Services.prefs.getBoolPref(EMAIL_TP_PREF),
+          true,
+          `${EMAIL_TP_PREF} has been set to true`
+        );
+        break;
+      case "-emailTP":
+        is(
+          Services.prefs.getBoolPref(EMAIL_TP_PREF),
+          false,
+          `${EMAIL_TP_PREF} has been set to false`
+        );
+        break;
+      case "emailTPPrivate":
+        is(
+          Services.prefs.getBoolPref(EMAIL_TP_PBM_PREF),
+          true,
+          `${EMAIL_TP_PBM_PREF} has been set to true`
+        );
+        break;
+      case "-emailTPPrivate":
+        is(
+          Services.prefs.getBoolPref(EMAIL_TP_PBM_PREF),
+          false,
+          `${EMAIL_TP_PBM_PREF} has been set to false`
+        );
+        break;
+      case "lvl2":
+        is(
+          Services.prefs.getBoolPref(LEVEL2_PREF),
+          true,
+          `${CM_PREF} has been set to true`
+        );
+        break;
+      case "-lvl2":
+        is(
+          Services.prefs.getBoolPref(LEVEL2_PREF),
+          false,
+          `${CM_PREF} has been set to false`
+        );
+        break;
+      case "rp":
+        is(
+          Services.prefs.getBoolPref(REFERRER_PREF),
+          true,
+          `${REFERRER_PREF} has been set to true`
+        );
+        break;
+      case "-rp":
+        is(
+          Services.prefs.getBoolPref(REFERRER_PREF),
+          false,
+          `${REFERRER_PREF} has been set to false`
+        );
+        break;
+      case "rpTop":
+        is(
+          Services.prefs.getBoolPref(REFERRER_TOP_PREF),
+          true,
+          `${REFERRER_TOP_PREF} has been set to true`
+        );
+        break;
+      case "-rpTop":
+        is(
+          Services.prefs.getBoolPref(REFERRER_TOP_PREF),
+          false,
+          `${REFERRER_TOP_PREF} has been set to false`
+        );
+        break;
+      case "ocsp":
+        is(
+          Services.prefs.getBoolPref(OCSP_PREF),
+          true,
+          `${OCSP_PREF} has been set to true`
+        );
+        break;
+      case "-ocsp":
+        is(
+          Services.prefs.getBoolPref(OCSP_PREF),
+          false,
+          `${OCSP_PREF} has been set to false`
+        );
+        break;
+      case "qps":
+        is(
+          Services.prefs.getBoolPref(QUERY_PARAM_STRIP_PREF),
+          true,
+          `${QUERY_PARAM_STRIP_PREF} has been set to true`
+        );
+        break;
+      case "-qps":
+        is(
+          Services.prefs.getBoolPref(QUERY_PARAM_STRIP_PREF),
+          false,
+          `${QUERY_PARAM_STRIP_PREF} has been set to false`
+        );
+        break;
+      case "qpsPBM":
+        is(
+          Services.prefs.getBoolPref(QUERY_PARAM_STRIP_PBM_PREF),
+          true,
+          `${QUERY_PARAM_STRIP_PBM_PREF} has been set to true`
+        );
+        break;
+      case "-qpsPBM":
+        is(
+          Services.prefs.getBoolPref(QUERY_PARAM_STRIP_PBM_PREF),
+          false,
+          `${QUERY_PARAM_STRIP_PBM_PREF} has been set to false`
+        );
+        break;
+      case "fpp":
+        is(
+          Services.prefs.getBoolPref(FPP_PREF),
+          true,
+          `${FPP_PREF} has been set to true`
+        );
+        break;
+      case "-fpp":
+        is(
+          Services.prefs.getBoolPref(FPP_PREF),
+          false,
+          `${FPP_PREF} has been set to false`
+        );
+        break;
+      case "fppPrivate":
+        is(
+          Services.prefs.getBoolPref(FPP_PBM_PREF),
+          true,
+          `${FPP_PBM_PREF} has been set to true`
+        );
+        break;
+      case "-fppPrivate":
+        is(
+          Services.prefs.getBoolPref(FPP_PBM_PREF),
+          false,
+          `${FPP_PBM_PREF} has been set to false`
+        );
+        break;
+      case "cookieBehavior0":
+        is(
+          Services.prefs.getIntPref(NCB_PREF),
+          Ci.nsICookieService.BEHAVIOR_ACCEPT,
+          `${NCB_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_ACCEPT}`
+        );
+        break;
+      case "cookieBehavior1":
+        is(
+          Services.prefs.getIntPref(NCB_PREF),
+          Ci.nsICookieService.BEHAVIOR_REJECT_FOREIGN,
+          `${NCB_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_REJECT_FOREIGN}`
+        );
+        break;
+      case "cookieBehavior2":
+        is(
+          Services.prefs.getIntPref(NCB_PREF),
+          Ci.nsICookieService.BEHAVIOR_REJECT,
+          `${NCB_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_REJECT}`
+        );
+        break;
+      case "cookieBehavior3":
+        is(
+          Services.prefs.getIntPref(NCB_PREF),
+          Ci.nsICookieService.BEHAVIOR_LIMIT_FOREIGN,
+          `${NCB_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_LIMIT_FOREIGN}`
+        );
+        break;
+      case "cookieBehavior4":
+        is(
+          Services.prefs.getIntPref(NCB_PREF),
+          Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER,
+          `${NCB_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER}`
+        );
+        break;
+      case "cookieBehavior5":
+        is(
+          Services.prefs.getIntPref(NCB_PREF),
+          Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN,
+          `${NCB_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN}`
+        );
+        break;
+      case "cookieBehaviorPBM0":
+        is(
+          Services.prefs.getIntPref(NCBP_PREF),
+          Ci.nsICookieService.BEHAVIOR_ACCEPT,
+          `${NCBP_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_ACCEPT}`
+        );
+        break;
+      case "cookieBehaviorPBM1":
+        is(
+          Services.prefs.getIntPref(NCBP_PREF),
+          Ci.nsICookieService.BEHAVIOR_REJECT_FOREIGN,
+          `${NCBP_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_REJECT_FOREIGN}`
+        );
+        break;
+      case "cookieBehaviorPBM2":
+        is(
+          Services.prefs.getIntPref(NCBP_PREF),
+          Ci.nsICookieService.BEHAVIOR_REJECT,
+          `${NCBP_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_REJECT}`
+        );
+        break;
+      case "cookieBehaviorPBM3":
+        is(
+          Services.prefs.getIntPref(NCBP_PREF),
+          Ci.nsICookieService.BEHAVIOR_LIMIT_FOREIGN,
+          `${NCBP_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_LIMIT_FOREIGN}`
+        );
+        break;
+      case "cookieBehaviorPBM4":
+        is(
+          Services.prefs.getIntPref(NCBP_PREF),
+          Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER,
+          `${NCBP_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER}`
+        );
+        break;
+      case "cookieBehaviorPBM5":
+        is(
+          Services.prefs.getIntPref(NCBP_PREF),
+          Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN,
+          `${NCBP_PREF} has been set to ${Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN}`
+        );
+        break;
+      default:
+        ok(false, "unknown option was added to the strict pref");
+        break;
+    }
+  }
+
+  gBrowser.removeCurrentTab();
+});
+
+// Tests that the content blocking "Custom" category behaves as expected.
+add_task(async function testContentBlockingCustomCategory() {
+  let untouchedPrefs = [
+    TP_PREF,
+    TP_PBM_PREF,
+    NCB_PREF,
+    NCBP_PREF,
+    FP_PREF,
+    STP_PREF,
+    CM_PREF,
+    REFERRER_PREF,
+    REFERRER_TOP_PREF,
+    OCSP_PREF,
+    QUERY_PARAM_STRIP_PREF,
+    QUERY_PARAM_STRIP_PBM_PREF,
+  ];
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  let doc = gBrowser.contentDocument;
+  let strictRadioOption = doc.getElementById("strictRadio");
+  let standardRadioOption = doc.getElementById("standardRadio");
+  let customRadioOption = doc.getElementById("customRadio");
+  let defaults = new Preferences({ defaultBranch: true });
+
+  standardRadioOption.click();
+  await TestUtils.waitForCondition(
+    () => !Services.prefs.prefHasUserValue(TP_PREF)
+  );
+
+  customRadioOption.click();
+  await TestUtils.waitForCondition(
+    () => Services.prefs.getStringPref(CAT_PREF) == "custom"
+  );
+
+  // The custom option will only force change of some prefs, like CAT_PREF. All
+  // other prefs should remain as they were for standard.
+  for (let pref of untouchedPrefs) {
+    ok(
+      !Services.prefs.prefHasUserValue(pref),
+      `the pref ${pref} remains as default value`
+    );
+  }
+
+  is(
+    Services.prefs.getStringPref(CAT_PREF),
+    "custom",
+    `${CAT_PREF} has been set to custom`
+  );
+
+  strictRadioOption.click();
+  await TestUtils.waitForCondition(
+    () => Services.prefs.getStringPref(CAT_PREF) == "strict"
+  );
+
+  // Changing the following prefs should necessarily set CAT_PREF to "custom"
+  for (let pref of [
+    FP_PREF,
+    STP_PREF,
+    CM_PREF,
+    TP_PREF,
+    TP_PBM_PREF,
+    REFERRER_PREF,
+    REFERRER_TOP_PREF,
+    OCSP_PREF,
+    QUERY_PARAM_STRIP_PREF,
+    QUERY_PARAM_STRIP_PBM_PREF,
+  ]) {
+    Services.prefs.setBoolPref(pref, !Services.prefs.getBoolPref(pref));
+    await TestUtils.waitForCondition(
+      () => Services.prefs.getStringPref(CAT_PREF) == "custom"
+    );
+    is(
+      Services.prefs.getStringPref(CAT_PREF),
+      "custom",
+      `${CAT_PREF} has been set to custom`
+    );
+
+    strictRadioOption.click();
+    await TestUtils.waitForCondition(
+      () => Services.prefs.getStringPref(CAT_PREF) == "strict"
+    );
+  }
+
+  // Changing the NCB_PREF should necessarily set CAT_PREF to "custom"
+  let defaultNCB = defaults.get(NCB_PREF);
+  let nonDefaultNCB;
+  switch (defaultNCB) {
+    case Ci.nsICookieService.BEHAVIOR_ACCEPT:
+      nonDefaultNCB = Ci.nsICookieService.BEHAVIOR_REJECT;
+      break;
+    case Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER:
+    case Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN:
+      nonDefaultNCB = Ci.nsICookieService.BEHAVIOR_ACCEPT;
+      break;
+    default:
+      ok(
+        false,
+        "Unexpected default value found for " + NCB_PREF + ": " + defaultNCB
+      );
+      break;
+  }
+  Services.prefs.setIntPref(NCB_PREF, nonDefaultNCB);
+  await TestUtils.waitForCondition(() =>
+    Services.prefs.prefHasUserValue(NCB_PREF)
+  );
+  is(
+    Services.prefs.getStringPref(CAT_PREF),
+    "custom",
+    `${CAT_PREF} has been set to custom`
+  );
+
+  strictRadioOption.click();
+  await TestUtils.waitForCondition(
+    () => Services.prefs.getStringPref(CAT_PREF) == "strict"
+  );
+
+  // Changing the NCBP_PREF should necessarily set CAT_PREF to "custom"
+  let defaultNCBP = defaults.get(NCBP_PREF);
+  let nonDefaultNCBP;
+  switch (defaultNCBP) {
+    case Ci.nsICookieService.BEHAVIOR_ACCEPT:
+      nonDefaultNCBP = Ci.nsICookieService.BEHAVIOR_REJECT;
+      break;
+    case Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER:
+    case Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN:
+      nonDefaultNCBP = Ci.nsICookieService.BEHAVIOR_ACCEPT;
+      break;
+    default:
+      ok(
+        false,
+        "Unexpected default value found for " + NCBP_PREF + ": " + defaultNCBP
+      );
+      break;
+  }
+  Services.prefs.setIntPref(NCBP_PREF, nonDefaultNCBP);
+  await TestUtils.waitForCondition(() =>
+    Services.prefs.prefHasUserValue(NCBP_PREF)
+  );
+  is(
+    Services.prefs.getStringPref(CAT_PREF),
+    "custom",
+    `${CAT_PREF} has been set to custom`
+  );
+
+  for (let pref of untouchedPrefs) {
+    SpecialPowers.clearUserPref(pref);
+  }
+
+  gBrowser.removeCurrentTab();
+});
+
+function checkControlState(doc, controls, enabled) {
+  for (let selector of controls) {
+    for (let control of doc.querySelectorAll(selector)) {
+      if (enabled) {
+        ok(!control.hasAttribute("disabled"), `${selector} is enabled.`);
+      } else {
+        is(
+          control.getAttribute("disabled"),
+          "true",
+          `${selector} is disabled.`
+        );
+      }
+    }
+  }
+}
+
+// Checks that the menulists for tracking protection and cookie blocking are disabled when all TP prefs are off.
+add_task(async function testContentBlockingDependentTPControls() {
+  SpecialPowers.pushPrefEnv({
+    set: [
+      [TP_PREF, false],
+      [TP_PBM_PREF, false],
+      [NCB_PREF, Ci.nsICookieService.BEHAVIOR_ACCEPT],
+      [CAT_PREF, "custom"],
+    ],
+  });
+
+  let disabledControls = ["#trackingProtectionMenu", "#blockCookiesMenu"];
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  let doc = gBrowser.contentDocument;
+  checkControlState(doc, disabledControls, false);
+
+  gBrowser.removeCurrentTab();
+});
+
+// Checks that disabling tracking protection also disables email tracking protection.
+add_task(async function testDisableTPCheckBoxDisablesEmailTP() {
+  SpecialPowers.pushPrefEnv({
+    set: [
+      [TP_PREF, false],
+      [TP_PBM_PREF, true],
+      [EMAIL_TP_PREF, false],
+      [EMAIL_TP_PBM_PREF, true],
+      [CAT_PREF, "custom"],
+    ],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  let doc = gBrowser.contentDocument;
+
+  // Click the checkbox to disable TP and check if this disables Email TP.
+  let tpCheckbox = doc.getElementById(
+    "contentBlockingTrackingProtectionCheckbox"
+  );
+
+  // Verify the initial check state of the tracking protection checkbox.
+  is(
+    tpCheckbox.getAttribute("checked"),
+    "true",
+    "Tracking protection checkbox is checked initially"
+  );
+
+  tpCheckbox.click();
+
+  // Verify the checkbox is unchecked after clicking.
+  is(
+    tpCheckbox.getAttribute("checked"),
+    "",
+    "Tracking protection checkbox is unchecked"
+  );
+
+  // Verify the pref states.
+  is(
+    Services.prefs.getBoolPref(EMAIL_TP_PREF),
+    false,
+    `${EMAIL_TP_PREF} has been set to false`
+  );
+
+  is(
+    Services.prefs.getBoolPref(EMAIL_TP_PBM_PREF),
+    false,
+    `${EMAIL_TP_PBM_PREF} has been set to false`
+  );
+
+  gBrowser.removeCurrentTab();
+});
+
+// Checks that the email tracking prefs set properly with tracking protection
+// drop downs.
+add_task(async function testTPMenuForEmailTP() {
+  SpecialPowers.pushPrefEnv({
+    set: [
+      [TP_PREF, false],
+      [TP_PBM_PREF, true],
+      [EMAIL_TP_PREF, false],
+      [EMAIL_TP_PBM_PREF, true],
+      [CAT_PREF, "custom"],
+    ],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  let doc = gBrowser.contentDocument;
+
+  let menu = doc.querySelector("#trackingProtectionMenu");
+  let always = doc.querySelector(
+    "#trackingProtectionMenu > menupopup > menuitem[value=always]"
+  );
+  let privateElement = doc.querySelector(
+    "#trackingProtectionMenu > menupopup > menuitem[value=private]"
+  );
+
+  // Click the always option on the tracking protection drop down.
+  menu.selectedItem = always;
+  always.click();
+
+  // Verify the pref states.
+  is(
+    Services.prefs.getBoolPref(EMAIL_TP_PREF),
+    true,
+    `${EMAIL_TP_PREF} has been set to true`
+  );
+
+  is(
+    Services.prefs.getBoolPref(EMAIL_TP_PBM_PREF),
+    true,
+    `${EMAIL_TP_PBM_PREF} has been set to true`
+  );
+
+  // Click the private-only option on the tracking protection drop down.
+  menu.selectedItem = privateElement;
+  privateElement.click();
+
+  // Verify the pref states.
+  is(
+    Services.prefs.getBoolPref(EMAIL_TP_PREF),
+    false,
+    `${EMAIL_TP_PREF} has been set to false`
+  );
+
+  is(
+    Services.prefs.getBoolPref(EMAIL_TP_PBM_PREF),
+    true,
+    `${EMAIL_TP_PBM_PREF} has been set to true`
+  );
+
+  gBrowser.removeCurrentTab();
+});
+
+// Ensure the FPP checkbox in ETP custom works properly.
+add_task(async function testFPPCustomCheckBox() {
+  // Set the FPP prefs to the default state.
+  SpecialPowers.pushPrefEnv({
+    set: [
+      [FPP_PREF, false],
+      [FPP_PBM_PREF, true],
+      [CAT_PREF, "custom"],
+    ],
+  });
+
+  // Clear glean before testing.
+  Services.fog.testResetFOG();
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  let doc = gBrowser.contentDocument;
+
+  let fppCheckbox = doc.querySelector(
+    "#contentBlockingFingerprintingProtectionCheckbox"
+  );
+
+  // Verify the default state of the FPP checkbox.
+  ok(fppCheckbox, "FPP checkbox exists");
+  is(fppCheckbox.getAttribute("checked"), "true", "FPP checkbox is checked");
+
+  let menu = doc.querySelector("#fingerprintingProtectionMenu");
+  let alwaysMenuItem = doc.querySelector(
+    "#fingerprintingProtectionMenu > menupopup > menuitem[value=always]"
+  );
+  let privateMenuItem = doc.querySelector(
+    "#fingerprintingProtectionMenu > menupopup > menuitem[value=private]"
+  );
+
+  // Click the always option on the FPP drop down.
+  menu.selectedItem = alwaysMenuItem;
+  alwaysMenuItem.click();
+
+  // Verify the pref states and the telemetry.
+  is(
+    Services.prefs.getBoolPref(FPP_PREF),
+    true,
+    `${FPP_PREF} has been set to true`
+  );
+
+  is(
+    Services.prefs.getBoolPref(FPP_PBM_PREF),
+    true,
+    `${FPP_PBM_PREF} has been set to true`
+  );
+
+  let events = Glean.privacyUiFppClick.menu.testGetValue();
+  is(events.length, 1, "The event length is correct");
+  is(events[0].extra.value, "always", "The extra field is correct.");
+
+  // Click the private-only option on the FPP drop down.
+  menu.selectedItem = privateMenuItem;
+  privateMenuItem.click();
+
+  // Verify the pref states and the telemetry.
+  is(
+    Services.prefs.getBoolPref(FPP_PREF),
+    false,
+    `${FPP_PREF} has been set to true`
+  );
+
+  is(
+    Services.prefs.getBoolPref(FPP_PBM_PREF),
+    true,
+    `${FPP_PBM_PREF} has been set to true`
+  );
+
+  events = Glean.privacyUiFppClick.menu.testGetValue();
+  is(events.length, 2, "The event length is correct");
+  is(events[1].extra.value, "private", "The extra field is correct.");
+
+  // Uncheck the checkbox
+  fppCheckbox.click();
+
+  // Verify the pref states and the telemetry.
+  is(
+    Services.prefs.getBoolPref(FPP_PREF),
+    false,
+    `${FPP_PREF} has been set to true`
+  );
+
+  is(
+    Services.prefs.getBoolPref(FPP_PBM_PREF),
+    false,
+    `${FPP_PBM_PREF} has been set to true`
+  );
+  is(menu.disabled, true, "The menu is disabled as the checkbox is unchecked");
+
+  events = Glean.privacyUiFppClick.checkbox.testGetValue();
+  is(events.length, 1, "The event length is correct");
+  is(events[0].extra.checked, "false", "The extra field is correct.");
+
+  // Check the checkbox again.
+  fppCheckbox.click();
+
+  // Verify the pref states and telemetry.
+  is(
+    Services.prefs.getBoolPref(FPP_PREF),
+    false,
+    `${FPP_PREF} has been set to true`
+  );
+
+  is(
+    Services.prefs.getBoolPref(FPP_PBM_PREF),
+    true,
+    `${FPP_PBM_PREF} has been set to true`
+  );
+  is(menu.disabled, false, "The menu is enabled as the checkbox is checked");
+
+  events = Glean.privacyUiFppClick.checkbox.testGetValue();
+  is(events.length, 2, "The event length is correct");
+  is(events[1].extra.checked, "true", "The extra field is correct.");
+
+  gBrowser.removeCurrentTab();
+});
+
+// Checks that social media trackers, cryptomining and fingerprinting visibility
+// can be controlled via pref.
+add_task(async function testCustomOptionsVisibility() {
+  Services.prefs.setBoolPref(
+    "browser.contentblocking.cryptomining.preferences.ui.enabled",
+    false
+  );
+  Services.prefs.setBoolPref(
+    "browser.contentblocking.fingerprinting.preferences.ui.enabled",
+    false
+  );
+  Services.prefs.setBoolPref(
+    "privacy.socialtracking.block_cookies.enabled",
+    false
+  );
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+
+  let doc = gBrowser.contentDocument;
+  let cryptominersOption = doc.getElementById(
+    "contentBlockingCryptominersOption"
+  );
+  let fingerprintersOption = doc.getElementById(
+    "contentBlockingFingerprintersOption"
+  );
+
+  ok(cryptominersOption.hidden, "Cryptomining is hidden");
+  ok(fingerprintersOption.hidden, "Fingerprinting is hidden");
+
+  gBrowser.removeCurrentTab();
+
+  Services.prefs.setBoolPref(
+    "browser.contentblocking.cryptomining.preferences.ui.enabled",
+    true
+  );
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+
+  doc = gBrowser.contentDocument;
+  cryptominersOption = doc.getElementById("contentBlockingCryptominersOption");
+  fingerprintersOption = doc.getElementById(
+    "contentBlockingFingerprintersOption"
+  );
+
+  ok(!cryptominersOption.hidden, "Cryptomining is shown");
+  ok(fingerprintersOption.hidden, "Fingerprinting is hidden");
+
+  gBrowser.removeCurrentTab();
+
+  Services.prefs.setBoolPref(
+    "browser.contentblocking.fingerprinting.preferences.ui.enabled",
+    true
+  );
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+
+  doc = gBrowser.contentDocument;
+  cryptominersOption = doc.getElementById("contentBlockingCryptominersOption");
+  fingerprintersOption = doc.getElementById(
+    "contentBlockingFingerprintersOption"
+  );
+
+  ok(!cryptominersOption.hidden, "Cryptomining is shown");
+  ok(!fingerprintersOption.hidden, "Fingerprinting is shown");
+
+  gBrowser.removeCurrentTab();
+
+  // Social media trackers UI should be hidden
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+
+  doc = gBrowser.contentDocument;
+  let socialTrackingUI = [...doc.querySelectorAll(".social-media-option")];
+
+  ok(
+    socialTrackingUI.every(el => el.hidden),
+    "All Social media tracker UI instances are hidden"
+  );
+
+  gBrowser.removeCurrentTab();
+
+  // Social media trackers UI should be visible
+  Services.prefs.setBoolPref(
+    "privacy.socialtracking.block_cookies.enabled",
+    true
+  );
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+
+  doc = gBrowser.contentDocument;
+  socialTrackingUI = [...doc.querySelectorAll(".social-media-option")];
+
+  ok(
+    !socialTrackingUI.every(el => el.hidden),
+    "All Social media tracker UI instances are visible"
+  );
+
+  gBrowser.removeCurrentTab();
+
+  Services.prefs.clearUserPref(
+    "browser.contentblocking.cryptomining.preferences.ui.enabled"
+  );
+  Services.prefs.clearUserPref(
+    "browser.contentblocking.fingerprinting.preferences.ui.enabled"
+  );
+  Services.prefs.clearUserPref("privacy.socialtracking.block_cookies.enabled");
+});
+
+// Checks that adding a custom enterprise policy will put the user in the custom category.
+// Other categories will be disabled.
+add_task(async function testPolicyCategorization() {
+  Services.prefs.setStringPref(CAT_PREF, "standard");
+  is(
+    Services.prefs.getStringPref(CAT_PREF),
+    "standard",
+    `${CAT_PREF} starts on standard`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(TP_PREF),
+    `${TP_PREF} starts with the default value`
+  );
+  PoliciesPrefTracker.start();
+
+  await EnterprisePolicyTesting.setupPolicyEngineWithJson({
+    policies: {
+      EnableTrackingProtection: {
+        Value: true,
+      },
+    },
+  });
+  EnterprisePolicyTesting.checkPolicyPref(TP_PREF, true, false);
+  is(
+    Services.prefs.getStringPref(CAT_PREF),
+    "custom",
+    `${CAT_PREF} has been set to custom`
+  );
+
+  Services.prefs.setStringPref(CAT_PREF, "standard");
+  is(
+    Services.prefs.getStringPref(CAT_PREF),
+    "standard",
+    `${CAT_PREF} starts on standard`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(NCB_PREF),
+    `${NCB_PREF} starts with the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(NCBP_PREF),
+    `${NCBP_PREF} starts with the default value`
+  );
+
+  let uiUpdatedPromise = TestUtils.topicObserved("privacy-pane-tp-ui-updated");
+  await EnterprisePolicyTesting.setupPolicyEngineWithJson({
+    policies: {
+      Cookies: {
+        AcceptThirdParty: "never",
+        Locked: true,
+      },
+    },
+  });
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  await uiUpdatedPromise;
+
+  EnterprisePolicyTesting.checkPolicyPref(
+    NCB_PREF,
+    Ci.nsICookieService.BEHAVIOR_REJECT_FOREIGN,
+    true
+  );
+  EnterprisePolicyTesting.checkPolicyPref(
+    NCBP_PREF,
+    Ci.nsICookieService.BEHAVIOR_REJECT_FOREIGN,
+    true
+  );
+  is(
+    Services.prefs.getStringPref(CAT_PREF),
+    "custom",
+    `${CAT_PREF} has been set to custom`
+  );
+
+  let doc = gBrowser.contentDocument;
+  let strictRadioOption = doc.getElementById("strictRadio");
+  let standardRadioOption = doc.getElementById("standardRadio");
+  is(strictRadioOption.disabled, true, "the strict option is disabled");
+  is(standardRadioOption.disabled, true, "the standard option is disabled");
+
+  gBrowser.removeCurrentTab();
+
+  // Cleanup after this particular test.
+  if (Services.policies.status != Ci.nsIEnterprisePolicies.INACTIVE) {
+    await EnterprisePolicyTesting.setupPolicyEngineWithJson({
+      policies: {
+        Cookies: {
+          Locked: false,
+        },
+      },
+    });
+    await EnterprisePolicyTesting.setupPolicyEngineWithJson("");
+  }
+  is(
+    Services.policies.status,
+    Ci.nsIEnterprisePolicies.INACTIVE,
+    "Engine is inactive at the end of the test"
+  );
+
+  EnterprisePolicyTesting.resetRunOnceState();
+  PoliciesPrefTracker.stop();
+});
+
+// Tests that changing a content blocking pref shows the content blocking warning
+// to reload tabs to apply changes.
+add_task(async function testContentBlockingReloadWarning() {
+  Services.prefs.setStringPref(CAT_PREF, "standard");
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  let doc = gBrowser.contentDocument;
+  let reloadWarnings = [
+    ...doc.querySelectorAll(".content-blocking-warning.reload-tabs"),
+  ];
+  let allHidden = reloadWarnings.every(el => el.hidden);
+  ok(allHidden, "all of the warnings to reload tabs are initially hidden");
+
+  Services.prefs.setStringPref(CAT_PREF, "strict");
+
+  let strictWarning = doc.querySelector(
+    "#contentBlockingOptionStrict .content-blocking-warning.reload-tabs"
+  );
+  ok(
+    !BrowserTestUtils.isHidden(strictWarning),
+    "The warning in the strict section should be showing"
+  );
+
+  Services.prefs.setStringPref(CAT_PREF, "standard");
+  gBrowser.removeCurrentTab();
+});
+
+// Tests that changing a content blocking pref does not show the content blocking warning
+// if it is the only tab.
+add_task(async function testContentBlockingReloadWarningSingleTab() {
+  Services.prefs.setStringPref(CAT_PREF, "standard");
+  BrowserTestUtils.startLoadingURIString(
+    gBrowser.selectedBrowser,
+    PRIVACY_PAGE
+  );
+  await BrowserTestUtils.browserLoaded(
+    gBrowser.selectedBrowser,
+    false,
+    PRIVACY_PAGE
+  );
+
+  let reloadWarnings = [
+    ...gBrowser.contentDocument.querySelectorAll(
+      ".content-blocking-warning.reload-tabs"
+    ),
+  ];
+  ok(reloadWarnings.length, "must have at least one reload warning");
+  ok(
+    reloadWarnings.every(el => el.hidden),
+    "all of the warnings to reload tabs are initially hidden"
+  );
+
+  is(BrowserWindowTracker.windowCount, 1, "There is only one window open");
+  is(gBrowser.tabs.length, 1, "There is only one tab open");
+  Services.prefs.setStringPref(CAT_PREF, "strict");
+
+  ok(
+    reloadWarnings.every(el => el.hidden),
+    "all of the warnings to reload tabs are still hidden"
+  );
+  Services.prefs.setStringPref(CAT_PREF, "standard");
+  BrowserTestUtils.startLoadingURIString(
+    gBrowser.selectedBrowser,
+    "about:newtab"
+  );
+  await BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+});
+
+// Checks that the reload tabs message reloads all tabs except the active tab.
+add_task(async function testReloadTabsMessage() {
+  Services.prefs.setStringPref(CAT_PREF, "strict");
+  let exampleTab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "http://example.com"
+  );
+  let examplePinnedTab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "http://example.com"
+  );
+  gBrowser.pinTab(examplePinnedTab);
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  let doc = gBrowser.contentDocument;
+  let standardWarning = doc.querySelector(
+    "#contentBlockingOptionStandard .content-blocking-warning.reload-tabs"
+  );
+  let standardReloadButton = doc.querySelector(
+    "#contentBlockingOptionStandard .reload-tabs-button"
+  );
+
+  Services.prefs.setStringPref(CAT_PREF, "standard");
+  ok(
+    !BrowserTestUtils.isHidden(standardWarning),
+    "The warning in the standard section should be showing"
+  );
+
+  let exampleTabBrowserDiscardedPromise = BrowserTestUtils.waitForEvent(
+    exampleTab,
+    "TabBrowserDiscarded"
+  );
+  let examplePinnedTabLoadPromise = BrowserTestUtils.browserLoaded(
+    examplePinnedTab.linkedBrowser
+  );
+  standardReloadButton.click();
+  // The pinned example page had a load event
+  await examplePinnedTabLoadPromise;
+  // The other one had its browser discarded
+  await exampleTabBrowserDiscardedPromise;
+
+  ok(
+    BrowserTestUtils.isHidden(standardWarning),
+    "The warning in the standard section should have hidden after being clicked"
+  );
+
+  // cleanup
+  Services.prefs.setStringPref(CAT_PREF, "standard");
+  gBrowser.removeTab(exampleTab);
+  gBrowser.removeTab(examplePinnedTab);
+  gBrowser.removeCurrentTab();
+});
+
+// Checks that the RFP warning banner is properly shown when rfp prefs are enabled.
+add_task(async function testRFPWarningBanner() {
+  // Set the prefs to false before testing.
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["privacy.resistFingerprinting", false],
+      ["privacy.resistFingerprinting.pbmode", false],
+    ],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  let doc = gBrowser.contentDocument;
+  let rfpWarningBanner = doc.getElementById("rfpIncompatibilityWarning");
+
+  // Verify if the banner is hidden at the beginning.
+  ok(
+    !BrowserTestUtils.isVisible(rfpWarningBanner),
+    "The RFP warning banner is hidden at the beginning."
+  );
+
+  // Enable the RFP pref
+  await SpecialPowers.pushPrefEnv({
+    set: [["privacy.resistFingerprinting", true]],
+  });
+
+  // Verify if the banner is shown.
+  ok(
+    BrowserTestUtils.isVisible(rfpWarningBanner),
+    "The RFP warning banner is shown."
+  );
+
+  // Enable the RFP pref for private windows
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["privacy.resistFingerprinting", false],
+      ["privacy.resistFingerprinting.pbmode", true],
+    ],
+  });
+
+  // Verify if the banner is shown.
+  ok(
+    BrowserTestUtils.isVisible(rfpWarningBanner),
+    "The RFP warning banner is shown."
+  );
+
+  // Enable both RFP prefs.
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["privacy.resistFingerprinting", true],
+      ["privacy.resistFingerprinting.pbmode", true],
+    ],
+  });
+
+  // Verify if the banner is shown.
+  ok(
+    BrowserTestUtils.isVisible(rfpWarningBanner),
+    "The RFP warning banner is shown."
+  );
+
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_contentblocking_categories.js b/browser/components/preferences/tests/browser_contentblocking_categories.js
new file mode 100644
index 0000000000..9b9bbbb088
--- /dev/null
+++ b/browser/components/preferences/tests/browser_contentblocking_categories.js
@@ -0,0 +1,539 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/* eslint-env webextensions */
+
+ChromeUtils.defineESModuleGetters(this, {
+  Preferences: "resource://gre/modules/Preferences.sys.mjs",
+});
+
+const TP_PREF = "privacy.trackingprotection.enabled";
+const TP_PBM_PREF = "privacy.trackingprotection.pbmode.enabled";
+const NCB_PREF = "network.cookie.cookieBehavior";
+const NCBP_PREF = "network.cookie.cookieBehavior.pbmode";
+const CAT_PREF = "browser.contentblocking.category";
+const FP_PREF = "privacy.trackingprotection.fingerprinting.enabled";
+const CM_PREF = "privacy.trackingprotection.cryptomining.enabled";
+const STP_PREF = "privacy.trackingprotection.socialtracking.enabled";
+const EMAIL_TP_PREF = "privacy.trackingprotection.emailtracking.enabled";
+const EMAIL_TP_PBM_PREF =
+  "privacy.trackingprotection.emailtracking.pbmode.enabled";
+const LEVEL2_PREF = "privacy.annotate_channels.strict_list.enabled";
+const REFERRER_PREF = "network.http.referer.disallowCrossSiteRelaxingDefault";
+const REFERRER_TOP_PREF =
+  "network.http.referer.disallowCrossSiteRelaxingDefault.top_navigation";
+const OCSP_PREF = "privacy.partition.network_state.ocsp_cache";
+const QUERY_PARAM_STRIP_PREF = "privacy.query_stripping.enabled";
+const QUERY_PARAM_STRIP_PBM_PREF = "privacy.query_stripping.enabled.pbmode";
+const FPP_PREF = "privacy.fingerprintingProtection";
+const FPP_PBM_PREF = "privacy.fingerprintingProtection.pbmode";
+const STRICT_DEF_PREF = "browser.contentblocking.features.strict";
+
+// Tests that the content blocking standard category definition is based on the default settings of
+// the content blocking prefs.
+// Changing the definition does not remove the user from the category.
+add_task(async function testContentBlockingStandardDefinition() {
+  Services.prefs.setStringPref(CAT_PREF, "strict");
+  Services.prefs.setStringPref(CAT_PREF, "standard");
+  is(
+    Services.prefs.getStringPref(CAT_PREF),
+    "standard",
+    `${CAT_PREF} starts on standard`
+  );
+
+  ok(
+    !Services.prefs.prefHasUserValue(TP_PREF),
+    `${TP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(TP_PBM_PREF),
+    `${TP_PBM_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(FP_PREF),
+    `${FP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(CM_PREF),
+    `${CM_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(STP_PREF),
+    `${STP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(EMAIL_TP_PREF),
+    `${EMAIL_TP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(EMAIL_TP_PBM_PREF),
+    `${EMAIL_TP_PBM_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(NCB_PREF),
+    `${NCB_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(NCBP_PREF),
+    `${NCBP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(LEVEL2_PREF),
+    `${LEVEL2_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(REFERRER_PREF),
+    `${REFERRER_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(REFERRER_TOP_PREF),
+    `${REFERRER_TOP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(OCSP_PREF),
+    `${OCSP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(QUERY_PARAM_STRIP_PREF),
+    `${QUERY_PARAM_STRIP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(QUERY_PARAM_STRIP_PBM_PREF),
+    `${QUERY_PARAM_STRIP_PBM_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(FPP_PREF),
+    `${FPP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(FPP_PBM_PREF),
+    `${FPP_PBM_PREF} pref has the default value`
+  );
+
+  let defaults = Services.prefs.getDefaultBranch("");
+  let originalTP = defaults.getBoolPref(TP_PREF);
+  let originalTPPBM = defaults.getBoolPref(TP_PBM_PREF);
+  let originalFP = defaults.getBoolPref(FP_PREF);
+  let originalCM = defaults.getBoolPref(CM_PREF);
+  let originalSTP = defaults.getBoolPref(STP_PREF);
+  let originalEmailTP = defaults.getBoolPref(EMAIL_TP_PREF);
+  let originalEmailTPPBM = defaults.getBoolPref(EMAIL_TP_PBM_PREF);
+  let originalNCB = defaults.getIntPref(NCB_PREF);
+  let originalNCBP = defaults.getIntPref(NCBP_PREF);
+  let originalLEVEL2 = defaults.getBoolPref(LEVEL2_PREF);
+  let originalREFERRER = defaults.getBoolPref(REFERRER_PREF);
+  let originalREFERRERTOP = defaults.getBoolPref(REFERRER_TOP_PREF);
+  let originalOCSP = defaults.getBoolPref(OCSP_PREF);
+  let originalQueryParamStrip = defaults.getBoolPref(QUERY_PARAM_STRIP_PREF);
+  let originalQueryParamStripPBM = defaults.getBoolPref(
+    QUERY_PARAM_STRIP_PBM_PREF
+  );
+  let originalFPP = defaults.getBoolPref(FPP_PREF);
+  let originalFPPPBM = defaults.getBoolPref(FPP_PBM_PREF);
+
+  let nonDefaultNCB;
+  switch (originalNCB) {
+    case Ci.nsICookieService.BEHAVIOR_ACCEPT:
+      nonDefaultNCB = Ci.nsICookieService.BEHAVIOR_REJECT;
+      break;
+    default:
+      nonDefaultNCB = Ci.nsICookieService.BEHAVIOR_ACCEPT;
+      break;
+  }
+  let nonDefaultNCBP;
+  switch (originalNCBP) {
+    case Ci.nsICookieService.BEHAVIOR_ACCEPT:
+      nonDefaultNCBP = Ci.nsICookieService.BEHAVIOR_REJECT;
+      break;
+    default:
+      nonDefaultNCBP = Ci.nsICookieService.BEHAVIOR_ACCEPT;
+      break;
+  }
+  defaults.setIntPref(NCB_PREF, nonDefaultNCB);
+  defaults.setIntPref(NCBP_PREF, nonDefaultNCBP);
+  defaults.setBoolPref(TP_PREF, !originalTP);
+  defaults.setBoolPref(TP_PBM_PREF, !originalTPPBM);
+  defaults.setBoolPref(FP_PREF, !originalFP);
+  defaults.setBoolPref(CM_PREF, !originalCM);
+  defaults.setBoolPref(CM_PREF, !originalSTP);
+  defaults.setBoolPref(EMAIL_TP_PREF, !originalEmailTP);
+  defaults.setBoolPref(EMAIL_TP_PBM_PREF, !originalEmailTPPBM);
+  defaults.setIntPref(NCB_PREF, !originalNCB);
+  defaults.setBoolPref(LEVEL2_PREF, !originalLEVEL2);
+  defaults.setBoolPref(REFERRER_PREF, !originalREFERRER);
+  defaults.setBoolPref(REFERRER_TOP_PREF, !originalREFERRERTOP);
+  defaults.setBoolPref(OCSP_PREF, !originalOCSP);
+  defaults.setBoolPref(QUERY_PARAM_STRIP_PREF, !originalQueryParamStrip);
+  defaults.setBoolPref(QUERY_PARAM_STRIP_PBM_PREF, !originalQueryParamStripPBM);
+  defaults.setBoolPref(FPP_PREF, !originalFPP);
+  defaults.setBoolPref(FPP_PBM_PREF, !originalFPPPBM);
+
+  ok(
+    !Services.prefs.prefHasUserValue(TP_PREF),
+    `${TP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(TP_PBM_PREF),
+    `${TP_PBM_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(FP_PREF),
+    `${FP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(CM_PREF),
+    `${CM_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(STP_PREF),
+    `${STP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(EMAIL_TP_PREF),
+    `${EMAIL_TP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(EMAIL_TP_PBM_PREF),
+    `${EMAIL_TP_PBM_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(NCB_PREF),
+    `${NCB_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(NCBP_PREF),
+    `${NCBP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(LEVEL2_PREF),
+    `${LEVEL2_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(REFERRER_PREF),
+    `${REFERRER_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(REFERRER_TOP_PREF),
+    `${REFERRER_TOP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(OCSP_PREF),
+    `${OCSP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(QUERY_PARAM_STRIP_PREF),
+    `${QUERY_PARAM_STRIP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(QUERY_PARAM_STRIP_PBM_PREF),
+    `${QUERY_PARAM_STRIP_PBM_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(FPP_PREF),
+    `${FPP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(FPP_PBM_PREF),
+    `${FPP_PBM_PREF} pref has the default value`
+  );
+
+  // cleanup
+  defaults.setIntPref(NCB_PREF, originalNCB);
+  defaults.setBoolPref(TP_PREF, originalTP);
+  defaults.setBoolPref(TP_PBM_PREF, originalTPPBM);
+  defaults.setBoolPref(FP_PREF, originalFP);
+  defaults.setBoolPref(CM_PREF, originalCM);
+  defaults.setBoolPref(STP_PREF, originalSTP);
+  defaults.setBoolPref(EMAIL_TP_PREF, originalEmailTP);
+  defaults.setBoolPref(EMAIL_TP_PBM_PREF, originalEmailTPPBM);
+  defaults.setIntPref(NCB_PREF, originalNCB);
+  defaults.setIntPref(NCBP_PREF, originalNCBP);
+  defaults.setBoolPref(LEVEL2_PREF, originalLEVEL2);
+  defaults.setBoolPref(REFERRER_PREF, originalREFERRER);
+  defaults.setBoolPref(REFERRER_TOP_PREF, originalREFERRERTOP);
+  defaults.setBoolPref(OCSP_PREF, originalOCSP);
+  defaults.setBoolPref(QUERY_PARAM_STRIP_PREF, originalQueryParamStrip);
+  defaults.setBoolPref(QUERY_PARAM_STRIP_PBM_PREF, originalQueryParamStripPBM);
+  defaults.setBoolPref(FPP_PREF, originalFPP);
+  defaults.setBoolPref(FPP_PBM_PREF, originalFPPPBM);
+});
+
+// Tests that the content blocking strict category definition changes the behavior
+// of the strict category pref and all prefs it controls.
+// Changing the definition does not remove the user from the category.
+add_task(async function testContentBlockingStrictDefinition() {
+  let defaults = Services.prefs.getDefaultBranch("");
+  let originalStrictPref = defaults.getStringPref(STRICT_DEF_PREF);
+  defaults.setStringPref(
+    STRICT_DEF_PREF,
+    "tp,tpPrivate,fp,cm,cookieBehavior0,cookieBehaviorPBM0,stp,emailTP,emailTPPrivate,lvl2,rp,rpTop,ocsp,qps,qpsPBM,fpp,fppPrivate"
+  );
+  Services.prefs.setStringPref(CAT_PREF, "strict");
+  is(
+    Services.prefs.getStringPref(CAT_PREF),
+    "strict",
+    `${CAT_PREF} has changed to strict`
+  );
+
+  ok(
+    !Services.prefs.prefHasUserValue(STRICT_DEF_PREF),
+    `We changed the default value of ${STRICT_DEF_PREF}`
+  );
+  is(
+    Services.prefs.getStringPref(STRICT_DEF_PREF),
+    "tp,tpPrivate,fp,cm,cookieBehavior0,cookieBehaviorPBM0,stp,emailTP,emailTPPrivate,lvl2,rp,rpTop,ocsp,qps,qpsPBM,fpp,fppPrivate",
+    `${STRICT_DEF_PREF} changed to what we set.`
+  );
+
+  is(
+    Services.prefs.getBoolPref(TP_PREF),
+    true,
+    `${TP_PREF} pref has been set to true`
+  );
+  is(
+    Services.prefs.getBoolPref(TP_PBM_PREF),
+    true,
+    `${TP_PBM_PREF} pref has been set to true`
+  );
+  is(
+    Services.prefs.getBoolPref(FP_PREF),
+    true,
+    `${CM_PREF} pref has been set to true`
+  );
+  is(
+    Services.prefs.getBoolPref(CM_PREF),
+    true,
+    `${CM_PREF} pref has been set to true`
+  );
+  is(
+    Services.prefs.getBoolPref(STP_PREF),
+    true,
+    `${STP_PREF} pref has been set to true`
+  );
+  is(
+    Services.prefs.getBoolPref(EMAIL_TP_PREF),
+    true,
+    `${EMAIL_TP_PREF} pref has been set to true`
+  );
+  is(
+    Services.prefs.getBoolPref(EMAIL_TP_PBM_PREF),
+    true,
+    `${EMAIL_TP_PBM_PREF} pref has been set to true`
+  );
+  is(
+    Services.prefs.getIntPref(NCB_PREF),
+    Ci.nsICookieService.BEHAVIOR_ACCEPT,
+    `${NCB_PREF} has been set to BEHAVIOR_ACCEPT`
+  );
+  is(
+    Services.prefs.getIntPref(NCBP_PREF),
+    Ci.nsICookieService.BEHAVIOR_ACCEPT,
+    `${NCBP_PREF} has been set to BEHAVIOR_ACCEPT`
+  );
+  is(
+    Services.prefs.getBoolPref(LEVEL2_PREF),
+    true,
+    `${LEVEL2_PREF} pref has been set to true`
+  );
+  is(
+    Services.prefs.getBoolPref(REFERRER_PREF),
+    true,
+    `${REFERRER_PREF} pref has been set to true`
+  );
+  is(
+    Services.prefs.getBoolPref(REFERRER_TOP_PREF),
+    true,
+    `${REFERRER_TOP_PREF} pref has been set to true`
+  );
+  is(
+    Services.prefs.getBoolPref(OCSP_PREF),
+    true,
+    `${OCSP_PREF} pref has been set to true`
+  );
+  is(
+    Services.prefs.getBoolPref(QUERY_PARAM_STRIP_PREF),
+    true,
+    `${QUERY_PARAM_STRIP_PREF} pref has been set to true`
+  );
+  is(
+    Services.prefs.getBoolPref(QUERY_PARAM_STRIP_PBM_PREF),
+    true,
+    `${QUERY_PARAM_STRIP_PBM_PREF} pref has been set to true`
+  );
+  is(
+    Services.prefs.getBoolPref(FPP_PREF),
+    true,
+    `${FPP_PREF} pref has been set to true`
+  );
+  is(
+    Services.prefs.getBoolPref(FPP_PBM_PREF),
+    true,
+    `${FPP_PBM_PREF} pref has been set to true`
+  );
+
+  // Note, if a pref is not listed it will use the default value, however this is only meant as a
+  // backup if a mistake is made. The UI will not respond correctly.
+  defaults.setStringPref(STRICT_DEF_PREF, "");
+  ok(
+    !Services.prefs.prefHasUserValue(TP_PREF),
+    `${TP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(TP_PBM_PREF),
+    `${TP_PBM_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(FP_PREF),
+    `${FP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(CM_PREF),
+    `${CM_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(STP_PREF),
+    `${STP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(EMAIL_TP_PREF),
+    `${EMAIL_TP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(EMAIL_TP_PBM_PREF),
+    `${EMAIL_TP_PBM_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(NCB_PREF),
+    `${NCB_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(NCBP_PREF),
+    `${NCBP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(LEVEL2_PREF),
+    `${LEVEL2_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(REFERRER_PREF),
+    `${REFERRER_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(REFERRER_TOP_PREF),
+    `${REFERRER_TOP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(OCSP_PREF),
+    `${OCSP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(QUERY_PARAM_STRIP_PREF),
+    `${QUERY_PARAM_STRIP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(QUERY_PARAM_STRIP_PBM_PREF),
+    `${QUERY_PARAM_STRIP_PBM_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(FPP_PREF),
+    `${FPP_PREF} pref has the default value`
+  );
+  ok(
+    !Services.prefs.prefHasUserValue(FPP_PBM_PREF),
+    `${FPP_PBM_PREF} pref has the default value`
+  );
+
+  defaults.setStringPref(
+    STRICT_DEF_PREF,
+    "-tpPrivate,-fp,-cm,-tp,cookieBehavior3,cookieBehaviorPBM2,-stp,-emailTP,-emailTPPrivate,-lvl2,-rp,-ocsp,-qps,-qpsPBM,-fpp,-fppPrivate"
+  );
+  is(
+    Services.prefs.getBoolPref(TP_PREF),
+    false,
+    `${TP_PREF} pref has been set to false`
+  );
+  is(
+    Services.prefs.getBoolPref(TP_PBM_PREF),
+    false,
+    `${TP_PBM_PREF} pref has been set to false`
+  );
+  is(
+    Services.prefs.getBoolPref(FP_PREF),
+    false,
+    `${FP_PREF} pref has been set to false`
+  );
+  is(
+    Services.prefs.getBoolPref(CM_PREF),
+    false,
+    `${CM_PREF} pref has been set to false`
+  );
+  is(
+    Services.prefs.getBoolPref(STP_PREF),
+    false,
+    `${STP_PREF} pref has been set to false`
+  );
+  is(
+    Services.prefs.getBoolPref(EMAIL_TP_PREF),
+    false,
+    `${EMAIL_TP_PREF} pref has been set to false`
+  );
+  is(
+    Services.prefs.getBoolPref(EMAIL_TP_PBM_PREF),
+    false,
+    `${EMAIL_TP_PBM_PREF} pref has been set to false`
+  );
+  is(
+    Services.prefs.getIntPref(NCB_PREF),
+    Ci.nsICookieService.BEHAVIOR_LIMIT_FOREIGN,
+    `${NCB_PREF} has been set to BEHAVIOR_REJECT_TRACKER`
+  );
+  is(
+    Services.prefs.getIntPref(NCBP_PREF),
+    Ci.nsICookieService.BEHAVIOR_REJECT,
+    `${NCBP_PREF} has been set to BEHAVIOR_REJECT`
+  );
+  is(
+    Services.prefs.getBoolPref(LEVEL2_PREF),
+    false,
+    `${LEVEL2_PREF} pref has been set to false`
+  );
+  is(
+    Services.prefs.getBoolPref(REFERRER_PREF),
+    false,
+    `${REFERRER_PREF} pref has been set to false`
+  );
+  is(
+    Services.prefs.getBoolPref(REFERRER_TOP_PREF),
+    false,
+    `${REFERRER_TOP_PREF} pref has been set to false`
+  );
+  is(
+    Services.prefs.getBoolPref(OCSP_PREF),
+    false,
+    `${OCSP_PREF} pref has been set to false`
+  );
+  is(
+    Services.prefs.getBoolPref(QUERY_PARAM_STRIP_PREF),
+    false,
+    `${QUERY_PARAM_STRIP_PREF} pref has been set to false`
+  );
+  is(
+    Services.prefs.getBoolPref(QUERY_PARAM_STRIP_PBM_PREF),
+    false,
+    `${QUERY_PARAM_STRIP_PBM_PREF} pref has been set to false`
+  );
+  is(
+    Services.prefs.getBoolPref(FPP_PREF),
+    false,
+    `${FPP_PREF} pref has been set to false`
+  );
+  is(
+    Services.prefs.getBoolPref(FPP_PBM_PREF),
+    false,
+    `${FPP_PBM_PREF} pref has been set to false`
+  );
+
+  // cleanup
+  defaults.setStringPref(STRICT_DEF_PREF, originalStrictPref);
+  Services.prefs.setStringPref(CAT_PREF, "standard");
+});
diff --git a/browser/components/preferences/tests/browser_contentblocking_standard_tcp_section.js b/browser/components/preferences/tests/browser_contentblocking_standard_tcp_section.js
new file mode 100644
index 0000000000..31881c47a1
--- /dev/null
+++ b/browser/components/preferences/tests/browser_contentblocking_standard_tcp_section.js
@@ -0,0 +1,148 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Tests the TCP info box in the ETP standard section of about:preferences#privacy.
+ */
+
+ChromeUtils.defineESModuleGetters(this, {
+  Preferences: "resource://gre/modules/Preferences.sys.mjs",
+});
+
+const COOKIE_BEHAVIOR_PREF = "network.cookie.cookieBehavior";
+const CAT_PREF = "browser.contentblocking.category";
+
+const LEARN_MORE_URL =
+  Services.urlFormatter.formatURLPref("app.support.baseURL") +
+  "total-cookie-protection";
+
+const {
+  BEHAVIOR_REJECT_TRACKER,
+  BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN,
+} = Ci.nsICookieService;
+
+async function testTCPSection({ dFPIEnabled }) {
+  info(
+    "Testing TCP preferences section in standard " +
+      JSON.stringify({ dFPIEnabled })
+  );
+
+  // In order to test the "standard" category we need to set the default value
+  // for the cookie behavior pref. A user value would get cleared as soon as we
+  // switch to "standard".
+  Services.prefs
+    .getDefaultBranch("")
+    .setIntPref(
+      COOKIE_BEHAVIOR_PREF,
+      dFPIEnabled
+        ? BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN
+        : BEHAVIOR_REJECT_TRACKER
+    );
+
+  // Setting to standard category explicitly, since changing the default cookie
+  // behavior still switches us to custom initially.
+  await SpecialPowers.pushPrefEnv({
+    set: [[CAT_PREF, "standard"]],
+  });
+
+  const uiEnabled =
+    Services.prefs.getIntPref(COOKIE_BEHAVIOR_PREF) ==
+    BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN;
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  let doc = gBrowser.contentDocument;
+
+  let standardRadioOption = doc.getElementById("standardRadio");
+  let strictRadioOption = doc.getElementById("strictRadio");
+  let customRadioOption = doc.getElementById("customRadio");
+
+  ok(standardRadioOption.selected, "Standard category is selected");
+
+  let etpStandardTCPBox = doc.getElementById("etpStandardTCPBox");
+  is(
+    BrowserTestUtils.isVisible(etpStandardTCPBox),
+    uiEnabled,
+    `TCP section in standard is ${uiEnabled ? " " : "not "}visible.`
+  );
+
+  if (uiEnabled) {
+    // If visible, test the TCP section elements.
+    let learnMoreLink = etpStandardTCPBox.querySelector("#tcp-learn-more-link");
+    ok(learnMoreLink, "Should have a learn more link");
+    BrowserTestUtils.isVisible(
+      learnMoreLink,
+      "Learn more link should be visible."
+    );
+    ok(
+      learnMoreLink.href && !learnMoreLink.href.startsWith("about:blank"),
+      "Learn more link should be valid."
+    );
+    is(
+      learnMoreLink.href,
+      LEARN_MORE_URL,
+      "Learn more link should have the correct target."
+    );
+
+    let description = etpStandardTCPBox.querySelector(".tail-with-learn-more");
+    ok(description, "Should have a description element.");
+    BrowserTestUtils.isVisible(description, "Description should be visible.");
+
+    let title = etpStandardTCPBox.querySelector(
+      ".content-blocking-warning-title"
+    );
+    ok(title, "Should have a title element.");
+    BrowserTestUtils.isVisible(title, "Title should be visible.");
+  }
+
+  info("Switch to ETP strict.");
+  let categoryPrefChange = waitForAndAssertPrefState(CAT_PREF, "strict");
+  strictRadioOption.click();
+  await categoryPrefChange;
+  ok(
+    !BrowserTestUtils.isVisible(etpStandardTCPBox),
+    "When strict is selected TCP UI is not visible."
+  );
+
+  info("Switch to ETP custom.");
+  categoryPrefChange = waitForAndAssertPrefState(CAT_PREF, "custom");
+  customRadioOption.click();
+  await categoryPrefChange;
+  ok(
+    !BrowserTestUtils.isVisible(etpStandardTCPBox),
+    "When custom is selected TCP UI is not visible."
+  );
+
+  info("Switch back to standard and ensure we show the TCP UI again.");
+  categoryPrefChange = waitForAndAssertPrefState(CAT_PREF, "standard");
+  standardRadioOption.click();
+  await categoryPrefChange;
+  is(
+    BrowserTestUtils.isVisible(etpStandardTCPBox),
+    uiEnabled,
+    `TCP section in standard is ${uiEnabled ? " " : "not "}visible.`
+  );
+
+  gBrowser.removeCurrentTab();
+  await SpecialPowers.popPrefEnv();
+  Services.prefs.setStringPref(CAT_PREF, "standard");
+}
+
+add_setup(async function () {
+  // Register cleanup function to restore default cookie behavior.
+  const defaultPrefs = Services.prefs.getDefaultBranch("");
+  const previousDefaultCB = defaultPrefs.getIntPref(COOKIE_BEHAVIOR_PREF);
+
+  registerCleanupFunction(function () {
+    defaultPrefs.setIntPref(COOKIE_BEHAVIOR_PREF, previousDefaultCB);
+  });
+});
+
+// Clients which don't have dFPI enabled should not see the
+// preferences section.
+add_task(async function test_dfpi_disabled() {
+  await testTCPSection({ dFPIEnabled: false });
+});
+
+add_task(async function test_dfpi_enabled() {
+  await testTCPSection({ dFPIEnabled: true });
+});
diff --git a/browser/components/preferences/tests/browser_cookie_exceptions_addRemove.js b/browser/components/preferences/tests/browser_cookie_exceptions_addRemove.js
new file mode 100644
index 0000000000..1b70170ddc
--- /dev/null
+++ b/browser/components/preferences/tests/browser_cookie_exceptions_addRemove.js
@@ -0,0 +1,299 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+if (AppConstants.TSAN || AppConstants.DEBUG) {
+  requestLongerTimeout(2);
+}
+
+const PERMISSIONS_URL =
+  "chrome://browser/content/preferences/dialogs/permissions.xhtml";
+
+async function openCookiesDialog(doc) {
+  let cookieExceptionsButton = doc.getElementById("cookieExceptions");
+  ok(cookieExceptionsButton, "cookieExceptionsButton found");
+  let dialogPromise = promiseLoadSubDialog(PERMISSIONS_URL);
+  cookieExceptionsButton.click();
+  let dialog = await dialogPromise;
+  return dialog;
+}
+
+function checkCookiesDialog(dialog) {
+  ok(dialog, "dialog loaded");
+  let buttonIds = ["removePermission", "removeAllPermissions"];
+
+  for (let buttonId of buttonIds) {
+    let button = dialog.document.getElementById(buttonId);
+    ok(button, `${buttonId} found`);
+  }
+
+  let dialogEl = dialog.document.querySelector("dialog");
+  let acceptBtn = dialogEl.getButton("accept");
+  let cancelBtn = dialogEl.getButton("cancel");
+
+  ok(!acceptBtn.hidden, "acceptButton found");
+  ok(!cancelBtn.hidden, "cancelButton found");
+}
+
+function addNewPermission(websiteAddress, dialog) {
+  let url = dialog.document.getElementById("url");
+  let buttonDialog = dialog.document.getElementById("btnBlock");
+  let permissionsBox = dialog.document.getElementById("permissionsBox");
+  let currentPermissions = permissionsBox.itemCount;
+
+  url.value = websiteAddress;
+  url.dispatchEvent(new Event("input", { bubbles: true }));
+  is(
+    buttonDialog.hasAttribute("disabled"),
+    false,
+    "When the user add an url the button should be clickable"
+  );
+  buttonDialog.click();
+
+  is(
+    permissionsBox.itemCount,
+    currentPermissions + 1,
+    "Website added in url should be in the list"
+  );
+}
+
+async function cleanList(dialog) {
+  let removeAllButton = dialog.document.getElementById("removeAllPermissions");
+  if (!removeAllButton.hasAttribute("disabled")) {
+    removeAllButton.click();
+  }
+}
+
+function addData(websites, dialog) {
+  for (let website of websites) {
+    addNewPermission(website, dialog);
+  }
+}
+
+function deletePermission(permission, dialog) {
+  let permissionsBox = dialog.document.getElementById("permissionsBox");
+  let elements = permissionsBox.getElementsByAttribute("origin", permission);
+  is(elements.length, 1, "It should find only one entry");
+  permissionsBox.selectItem(elements[0]);
+  let removePermissionButton =
+    dialog.document.getElementById("removePermission");
+  is(
+    removePermissionButton.hasAttribute("disabled"),
+    false,
+    "The button should be clickable to remove selected item"
+  );
+  removePermissionButton.click();
+}
+
+function save(dialog) {
+  let saveButton = dialog.document.querySelector("dialog").getButton("accept");
+  saveButton.click();
+}
+
+function cancel(dialog) {
+  let cancelButton = dialog.document
+    .querySelector("dialog")
+    .getButton("cancel");
+  ok(!cancelButton.hidden, "cancelButton found");
+  cancelButton.click();
+}
+
+async function checkExpected(expected, doc) {
+  let dialog = await openCookiesDialog(doc);
+  let permissionsBox = dialog.document.getElementById("permissionsBox");
+
+  is(
+    permissionsBox.itemCount,
+    expected.length,
+    `There should be ${expected.length} elements in the list`
+  );
+
+  for (let website of expected) {
+    let elements = permissionsBox.getElementsByAttribute("origin", website);
+    is(elements.length, 1, "It should find only one entry");
+  }
+  return dialog;
+}
+
+async function runTest(test, websites, doc) {
+  let dialog = await openCookiesDialog(doc);
+  checkCookiesDialog(dialog);
+
+  if (test.needPreviousData) {
+    addData(websites, dialog);
+    save(dialog);
+    dialog = await openCookiesDialog(doc);
+  }
+
+  for (let step of test.steps) {
+    switch (step) {
+      case "addNewPermission":
+        addNewPermission(test.newData, dialog);
+        break;
+      case "deletePermission":
+        deletePermission(test.newData, dialog);
+        break;
+      case "deleteAllPermission":
+        await cleanList(dialog);
+        break;
+      case "save":
+        save(dialog);
+        break;
+      case "cancel":
+        cancel(dialog);
+        break;
+      case "openPane":
+        dialog = await openCookiesDialog(doc);
+        break;
+      default:
+      // code block
+    }
+  }
+  dialog = await checkExpected(test.expected, doc);
+  await cleanList(dialog);
+  save(dialog);
+}
+
+add_task(async function checkPermissions() {
+  await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+  let win = gBrowser.selectedBrowser.contentWindow;
+  let doc = win.document;
+  let websites = ["http://test1.com", "http://test2.com"];
+
+  let tests = [
+    {
+      needPreviousData: false,
+      newData: "https://mytest.com",
+      steps: ["addNewPermission", "save"],
+      expected: ["https://mytest.com"], // when open the pane again it should find this in the list
+    },
+    {
+      needPreviousData: false,
+      newData: "https://mytest.com",
+      steps: ["addNewPermission", "cancel"],
+      expected: [],
+    },
+    {
+      needPreviousData: false,
+      newData: "https://mytest.com",
+      steps: ["addNewPermission", "deletePermission", "save"],
+      expected: [],
+    },
+    {
+      needPreviousData: false,
+      newData: "https://mytest.com",
+      steps: ["addNewPermission", "deletePermission", "cancel"],
+      expected: [],
+    },
+    {
+      needPreviousData: false,
+      newData: "https://mytest.com",
+      steps: [
+        "addNewPermission",
+        "save",
+        "openPane",
+        "deletePermission",
+        "save",
+      ],
+      expected: [],
+    },
+    {
+      needPreviousData: false,
+      newData: "https://mytest.com",
+      steps: [
+        "addNewPermission",
+        "save",
+        "openPane",
+        "deletePermission",
+        "cancel",
+      ],
+      expected: ["https://mytest.com"],
+    },
+    {
+      needPreviousData: false,
+      newData: "https://mytest.com",
+      steps: ["addNewPermission", "deleteAllPermission", "save"],
+      expected: [],
+    },
+    {
+      needPreviousData: false,
+      newData: "https://mytest.com",
+      steps: ["addNewPermission", "deleteAllPermission", "cancel"],
+      expected: [],
+    },
+    {
+      needPreviousData: false,
+      newData: "https://mytest.com",
+      steps: [
+        "addNewPermission",
+        "save",
+        "openPane",
+        "deleteAllPermission",
+        "save",
+      ],
+      expected: [],
+    },
+    {
+      needPreviousData: false,
+      newData: "https://mytest.com",
+      steps: [
+        "addNewPermission",
+        "save",
+        "openPane",
+        "deleteAllPermission",
+        "cancel",
+      ],
+      expected: ["https://mytest.com"],
+    },
+    {
+      needPreviousData: true,
+      newData: "https://mytest.com",
+      steps: ["deleteAllPermission", "save"],
+      expected: [],
+    },
+    {
+      needPreviousData: true,
+      newData: "https://mytest.com",
+      steps: ["deleteAllPermission", "cancel"],
+      expected: websites,
+    },
+    {
+      needPreviousData: true,
+      newData: "https://mytest.com",
+      steps: ["addNewPermission", "save"],
+      expected: (function () {
+        let result = websites.slice();
+        result.push("https://mytest.com");
+        return result;
+      })(),
+    },
+    {
+      needPreviousData: true,
+      newData: "https://mytest.com",
+      steps: ["addNewPermission", "cancel"],
+      expected: websites,
+    },
+    {
+      needPreviousData: false,
+      newData: "https://mytest.com",
+      steps: [
+        "addNewPermission",
+        "save",
+        "openPane",
+        "deleteAllPermission",
+        "addNewPermission",
+        "save",
+      ],
+      expected: ["https://mytest.com"],
+    },
+  ];
+
+  for (let test of tests) {
+    await runTest(test, websites, doc);
+  }
+
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_cookies_exceptions.js b/browser/components/preferences/tests/browser_cookies_exceptions.js
new file mode 100644
index 0000000000..d2d538a48a
--- /dev/null
+++ b/browser/components/preferences/tests/browser_cookies_exceptions.js
@@ -0,0 +1,568 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+requestLongerTimeout(3);
+
+add_task(async function testAllow() {
+  await runTest(
+    async (params, observeAllPromise, apply) => {
+      assertListContents(params, []);
+
+      params.url.value = "test.com";
+      params.btnAllow.doCommand();
+
+      assertListContents(params, [
+        ["http://test.com", params.allowL10nId],
+        ["https://test.com", params.allowL10nId],
+      ]);
+
+      apply();
+      await observeAllPromise;
+    },
+    params => {
+      return [
+        {
+          type: "cookie",
+          origin: "http://test.com",
+          data: "added",
+          capability: Ci.nsIPermissionManager.ALLOW_ACTION,
+        },
+        {
+          type: "cookie",
+          origin: "https://test.com",
+          data: "added",
+          capability: Ci.nsIPermissionManager.ALLOW_ACTION,
+        },
+      ];
+    }
+  );
+});
+
+add_task(async function testBlock() {
+  await runTest(
+    async (params, observeAllPromise, apply) => {
+      params.url.value = "test.com";
+      params.btnBlock.doCommand();
+
+      assertListContents(params, [
+        ["http://test.com", params.denyL10nId],
+        ["https://test.com", params.denyL10nId],
+      ]);
+
+      apply();
+      await observeAllPromise;
+    },
+    params => {
+      return [
+        {
+          type: "cookie",
+          origin: "http://test.com",
+          data: "changed",
+          capability: Ci.nsIPermissionManager.DENY_ACTION,
+        },
+        {
+          type: "cookie",
+          origin: "https://test.com",
+          data: "changed",
+          capability: Ci.nsIPermissionManager.DENY_ACTION,
+        },
+      ];
+    }
+  );
+});
+
+add_task(async function testAllowAgain() {
+  await runTest(
+    async (params, observeAllPromise, apply) => {
+      params.url.value = "test.com";
+      params.btnAllow.doCommand();
+
+      assertListContents(params, [
+        ["http://test.com", params.allowL10nId],
+        ["https://test.com", params.allowL10nId],
+      ]);
+
+      apply();
+      await observeAllPromise;
+    },
+    params => {
+      return [
+        {
+          type: "cookie",
+          origin: "http://test.com",
+          data: "changed",
+          capability: Ci.nsIPermissionManager.ALLOW_ACTION,
+        },
+        {
+          type: "cookie",
+          origin: "https://test.com",
+          data: "changed",
+          capability: Ci.nsIPermissionManager.ALLOW_ACTION,
+        },
+      ];
+    }
+  );
+});
+
+add_task(async function testRemove() {
+  await runTest(
+    async (params, observeAllPromise, apply) => {
+      while (params.richlistbox.itemCount) {
+        params.richlistbox.selectedIndex = 0;
+        params.btnRemove.doCommand();
+      }
+      assertListContents(params, []);
+
+      apply();
+      await observeAllPromise;
+    },
+    params => {
+      let richlistItems = params.richlistbox.getElementsByAttribute(
+        "origin",
+        "*"
+      );
+      let observances = [];
+      for (let item of richlistItems) {
+        observances.push({
+          type: "cookie",
+          origin: item.getAttribute("origin"),
+          data: "deleted",
+        });
+      }
+      return observances;
+    }
+  );
+});
+
+add_task(async function testAdd() {
+  await runTest(
+    async (params, observeAllPromise, apply) => {
+      let uri = Services.io.newURI("http://test.com");
+      PermissionTestUtils.add(
+        uri,
+        "popup",
+        Ci.nsIPermissionManager.DENY_ACTION
+      );
+
+      info("Adding unrelated permission should not change display.");
+      assertListContents(params, []);
+
+      apply();
+      await observeAllPromise;
+
+      PermissionTestUtils.remove(uri, "popup");
+    },
+    params => {
+      return [
+        {
+          type: "popup",
+          origin: "http://test.com",
+          data: "added",
+          capability: Ci.nsIPermissionManager.DENY_ACTION,
+        },
+      ];
+    }
+  );
+});
+
+add_task(async function testAllowHTTPSWithPort() {
+  await runTest(
+    async (params, observeAllPromise, apply) => {
+      params.url.value = "https://test.com:12345";
+      params.btnAllow.doCommand();
+
+      assertListContents(params, [
+        ["https://test.com:12345", params.allowL10nId],
+      ]);
+
+      apply();
+      await observeAllPromise;
+    },
+    params => {
+      return [
+        {
+          type: "cookie",
+          origin: "https://test.com:12345",
+          data: "added",
+          capability: Ci.nsIPermissionManager.ALLOW_ACTION,
+        },
+      ];
+    }
+  );
+});
+
+add_task(async function testBlockHTTPSWithPort() {
+  await runTest(
+    async (params, observeAllPromise, apply) => {
+      params.url.value = "https://test.com:12345";
+      params.btnBlock.doCommand();
+
+      assertListContents(params, [
+        ["https://test.com:12345", params.denyL10nId],
+      ]);
+
+      apply();
+      await observeAllPromise;
+    },
+    params => {
+      return [
+        {
+          type: "cookie",
+          origin: "https://test.com:12345",
+          data: "changed",
+          capability: Ci.nsIPermissionManager.DENY_ACTION,
+        },
+      ];
+    }
+  );
+});
+
+add_task(async function testAllowAgainHTTPSWithPort() {
+  await runTest(
+    async (params, observeAllPromise, apply) => {
+      params.url.value = "https://test.com:12345";
+      params.btnAllow.doCommand();
+
+      assertListContents(params, [
+        ["https://test.com:12345", params.allowL10nId],
+      ]);
+
+      apply();
+      await observeAllPromise;
+    },
+    params => {
+      return [
+        {
+          type: "cookie",
+          origin: "https://test.com:12345",
+          data: "changed",
+          capability: Ci.nsIPermissionManager.ALLOW_ACTION,
+        },
+      ];
+    }
+  );
+});
+
+add_task(async function testRemoveHTTPSWithPort() {
+  await runTest(
+    async (params, observeAllPromise, apply) => {
+      while (params.richlistbox.itemCount) {
+        params.richlistbox.selectedIndex = 0;
+        params.btnRemove.doCommand();
+      }
+
+      assertListContents(params, []);
+
+      apply();
+      await observeAllPromise;
+    },
+    params => {
+      let richlistItems = params.richlistbox.getElementsByAttribute(
+        "origin",
+        "*"
+      );
+      let observances = [];
+      for (let item of richlistItems) {
+        observances.push({
+          type: "cookie",
+          origin: item.getAttribute("origin"),
+          data: "deleted",
+        });
+      }
+      return observances;
+    }
+  );
+});
+
+add_task(async function testAllowPort() {
+  await runTest(
+    async (params, observeAllPromise, apply) => {
+      params.url.value = "localhost:12345";
+      params.btnAllow.doCommand();
+
+      assertListContents(params, [
+        ["http://localhost:12345", params.allowL10nId],
+        ["https://localhost:12345", params.allowL10nId],
+      ]);
+
+      apply();
+      await observeAllPromise;
+    },
+    params => {
+      return [
+        {
+          type: "cookie",
+          origin: "http://localhost:12345",
+          data: "added",
+          capability: Ci.nsIPermissionManager.ALLOW_ACTION,
+        },
+        {
+          type: "cookie",
+          origin: "https://localhost:12345",
+          data: "added",
+          capability: Ci.nsIPermissionManager.ALLOW_ACTION,
+        },
+      ];
+    }
+  );
+});
+
+add_task(async function testBlockPort() {
+  await runTest(
+    async (params, observeAllPromise, apply) => {
+      params.url.value = "localhost:12345";
+      params.btnBlock.doCommand();
+
+      assertListContents(params, [
+        ["http://localhost:12345", params.denyL10nId],
+        ["https://localhost:12345", params.denyL10nId],
+      ]);
+
+      apply();
+      await observeAllPromise;
+    },
+    params => {
+      return [
+        {
+          type: "cookie",
+          origin: "http://localhost:12345",
+          data: "changed",
+          capability: Ci.nsIPermissionManager.DENY_ACTION,
+        },
+        {
+          type: "cookie",
+          origin: "https://localhost:12345",
+          data: "changed",
+          capability: Ci.nsIPermissionManager.DENY_ACTION,
+        },
+      ];
+    }
+  );
+});
+
+add_task(async function testAllowAgainPort() {
+  await runTest(
+    async (params, observeAllPromise, apply) => {
+      params.url.value = "localhost:12345";
+      params.btnAllow.doCommand();
+
+      assertListContents(params, [
+        ["http://localhost:12345", params.allowL10nId],
+        ["https://localhost:12345", params.allowL10nId],
+      ]);
+
+      apply();
+      await observeAllPromise;
+    },
+    params => {
+      return [
+        {
+          type: "cookie",
+          origin: "http://localhost:12345",
+          data: "changed",
+          capability: Ci.nsIPermissionManager.ALLOW_ACTION,
+        },
+        {
+          type: "cookie",
+          origin: "https://localhost:12345",
+          data: "changed",
+          capability: Ci.nsIPermissionManager.ALLOW_ACTION,
+        },
+      ];
+    }
+  );
+});
+
+add_task(async function testRemovePort() {
+  await runTest(
+    async (params, observeAllPromise, apply) => {
+      while (params.richlistbox.itemCount) {
+        params.richlistbox.selectedIndex = 0;
+        params.btnRemove.doCommand();
+      }
+
+      assertListContents(params, []);
+
+      apply();
+      await observeAllPromise;
+    },
+    params => {
+      let richlistItems = params.richlistbox.getElementsByAttribute(
+        "origin",
+        "*"
+      );
+      let observances = [];
+      for (let item of richlistItems) {
+        observances.push({
+          type: "cookie",
+          origin: item.getAttribute("origin"),
+          data: "deleted",
+        });
+      }
+      return observances;
+    }
+  );
+});
+
+add_task(async function testSort() {
+  await runTest(
+    async (params, observeAllPromise, apply) => {
+      // Sort by site name.
+      EventUtils.synthesizeMouseAtCenter(
+        params.doc.getElementById("siteCol"),
+        {},
+        params.doc.defaultView
+      );
+
+      for (let URL of ["http://a", "http://z", "http://b"]) {
+        let URI = Services.io.newURI(URL);
+        PermissionTestUtils.add(
+          URI,
+          "cookie",
+          Ci.nsIPermissionManager.ALLOW_ACTION
+        );
+      }
+
+      assertListContents(params, [
+        ["http://a", params.allowL10nId],
+        ["http://b", params.allowL10nId],
+        ["http://z", params.allowL10nId],
+      ]);
+
+      // Sort by site name in descending order.
+      EventUtils.synthesizeMouseAtCenter(
+        params.doc.getElementById("siteCol"),
+        {},
+        params.doc.defaultView
+      );
+
+      assertListContents(params, [
+        ["http://z", params.allowL10nId],
+        ["http://b", params.allowL10nId],
+        ["http://a", params.allowL10nId],
+      ]);
+
+      apply();
+      await observeAllPromise;
+
+      for (let URL of ["http://a", "http://z", "http://b"]) {
+        let uri = Services.io.newURI(URL);
+        PermissionTestUtils.remove(uri, "cookie");
+      }
+    },
+    params => {
+      return [
+        {
+          type: "cookie",
+          origin: "http://a",
+          data: "added",
+          capability: Ci.nsIPermissionManager.ALLOW_ACTION,
+        },
+        {
+          type: "cookie",
+          origin: "http://z",
+          data: "added",
+          capability: Ci.nsIPermissionManager.ALLOW_ACTION,
+        },
+        {
+          type: "cookie",
+          origin: "http://b",
+          data: "added",
+          capability: Ci.nsIPermissionManager.ALLOW_ACTION,
+        },
+      ];
+    }
+  );
+});
+
+add_task(async function testPrivateBrowsingSessionPermissionsAreHidden() {
+  await runTest(
+    async (params, observeAllPromise, apply) => {
+      assertListContents(params, []);
+
+      let uri = Services.io.newURI("http://test.com");
+      let privateBrowsingPrincipal =
+        Services.scriptSecurityManager.createContentPrincipal(uri, {
+          privateBrowsingId: 1,
+        });
+
+      // Add a session permission for private browsing.
+      PermissionTestUtils.add(
+        privateBrowsingPrincipal,
+        "cookie",
+        Services.perms.ALLOW_ACTION,
+        Services.perms.EXPIRE_SESSION
+      );
+
+      assertListContents(params, []);
+
+      PermissionTestUtils.remove(uri, "cookie");
+    },
+    params => {
+      return [];
+    }
+  );
+});
+
+function assertListContents(params, expected) {
+  Assert.equal(params.richlistbox.itemCount, expected.length);
+
+  for (let i = 0; i < expected.length; i++) {
+    let website = expected[i][0];
+    let elements = params.richlistbox.getElementsByAttribute("origin", website);
+    Assert.equal(elements.length, 1); // "It should find only one coincidence"
+    Assert.equal(
+      elements[0]
+        .querySelector(".website-capability-value")
+        .getAttribute("data-l10n-id"),
+      expected[i][1]
+    );
+  }
+}
+
+async function runTest(test, getObservances) {
+  registerCleanupFunction(function () {
+    Services.prefs.clearUserPref("privacy.history.custom");
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+
+  let doc = gBrowser.contentDocument;
+  let historyMode = doc.getElementById("historyMode");
+  historyMode.value = "custom";
+  historyMode.doCommand();
+
+  let promiseSubDialogLoaded = promiseLoadSubDialog(
+    "chrome://browser/content/preferences/dialogs/permissions.xhtml"
+  );
+  doc.getElementById("cookieExceptions").doCommand();
+
+  let win = await promiseSubDialogLoaded;
+
+  doc = win.document;
+  let params = {
+    doc,
+    richlistbox: doc.getElementById("permissionsBox"),
+    url: doc.getElementById("url"),
+    btnAllow: doc.getElementById("btnAllow"),
+    btnBlock: doc.getElementById("btnBlock"),
+    btnRemove: doc.getElementById("removePermission"),
+    allowL10nId: win.gPermissionManager._getCapabilityL10nId(
+      Ci.nsIPermissionManager.ALLOW_ACTION
+    ),
+    denyL10nId: win.gPermissionManager._getCapabilityL10nId(
+      Ci.nsIPermissionManager.DENY_ACTION
+    ),
+    allow: Ci.nsIPermissionManager.ALLOW_ACTION,
+    deny: Ci.nsIPermissionManager.DENY_ACTION,
+  };
+  let btnApplyChanges = doc.querySelector("dialog").getButton("accept");
+  let observances = getObservances(params);
+  let observeAllPromise = createObserveAllPromise(observances);
+
+  await test(params, observeAllPromise, () => btnApplyChanges.doCommand());
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+}
diff --git a/browser/components/preferences/tests/browser_defaultbrowser_alwayscheck.js b/browser/components/preferences/tests/browser_defaultbrowser_alwayscheck.js
new file mode 100644
index 0000000000..415217db78
--- /dev/null
+++ b/browser/components/preferences/tests/browser_defaultbrowser_alwayscheck.js
@@ -0,0 +1,185 @@
+"use strict";
+
+const CHECK_DEFAULT_INITIAL = Services.prefs.getBoolPref(
+  "browser.shell.checkDefaultBrowser"
+);
+
+add_task(async function clicking_make_default_checks_alwaysCheck_checkbox() {
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, "about:preferences");
+
+  await test_with_mock_shellservice({ isDefault: false }, async function () {
+    let checkDefaultBrowserState = isDefault => {
+      let isDefaultPane = content.document.getElementById("isDefaultPane");
+      let isNotDefaultPane =
+        content.document.getElementById("isNotDefaultPane");
+      Assert.equal(
+        ContentTaskUtils.isHidden(isDefaultPane),
+        !isDefault,
+        "The 'browser is default' pane should be hidden when browser is not default"
+      );
+      Assert.equal(
+        ContentTaskUtils.isHidden(isNotDefaultPane),
+        isDefault,
+        "The 'make default' pane should be hidden when browser is default"
+      );
+    };
+
+    checkDefaultBrowserState(false);
+
+    let alwaysCheck = content.document.getElementById("alwaysCheckDefault");
+    Assert.ok(!alwaysCheck.checked, "Always Check is unchecked by default");
+    Assert.ok(
+      !Services.prefs.getBoolPref("browser.shell.checkDefaultBrowser"),
+      "alwaysCheck pref should be false by default in test runs"
+    );
+
+    let setDefaultButton = content.document.getElementById("setDefaultButton");
+    setDefaultButton.click();
+    content.window.gMainPane.updateSetDefaultBrowser();
+
+    await ContentTaskUtils.waitForCondition(
+      () => alwaysCheck.checked,
+      "'Always Check' checkbox should get checked after clicking the 'Set Default' button"
+    );
+
+    Assert.ok(
+      alwaysCheck.checked,
+      "Clicking 'Make Default' checks the 'Always Check' checkbox"
+    );
+    Assert.ok(
+      Services.prefs.getBoolPref("browser.shell.checkDefaultBrowser"),
+      "Checking the checkbox should set the pref to true"
+    );
+    Assert.ok(
+      alwaysCheck.disabled,
+      "'Always Check' checkbox is locked with default browser and alwaysCheck=true"
+    );
+    checkDefaultBrowserState(true);
+    Assert.ok(
+      Services.prefs.getBoolPref("browser.shell.checkDefaultBrowser"),
+      "checkDefaultBrowser pref is now enabled"
+    );
+  });
+
+  gBrowser.removeCurrentTab();
+  Services.prefs.clearUserPref("browser.shell.checkDefaultBrowser");
+});
+
+add_task(async function clicking_make_default_checks_alwaysCheck_checkbox() {
+  Services.prefs.lockPref("browser.shell.checkDefaultBrowser");
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, "about:preferences");
+
+  await test_with_mock_shellservice({ isDefault: false }, async function () {
+    let isDefaultPane = content.document.getElementById("isDefaultPane");
+    let isNotDefaultPane = content.document.getElementById("isNotDefaultPane");
+    Assert.ok(
+      ContentTaskUtils.isHidden(isDefaultPane),
+      "The 'browser is default' pane should be hidden when not default"
+    );
+    Assert.ok(
+      ContentTaskUtils.isVisible(isNotDefaultPane),
+      "The 'make default' pane should be visible when not default"
+    );
+
+    let alwaysCheck = content.document.getElementById("alwaysCheckDefault");
+    Assert.ok(alwaysCheck.disabled, "Always Check is disabled when locked");
+    Assert.ok(
+      alwaysCheck.checked,
+      "Always Check is checked because defaultPref is true and pref is locked"
+    );
+    Assert.ok(
+      Services.prefs.getBoolPref("browser.shell.checkDefaultBrowser"),
+      "alwaysCheck pref should ship with 'true' by default"
+    );
+
+    let setDefaultButton = content.document.getElementById("setDefaultButton");
+    setDefaultButton.click();
+    content.window.gMainPane.updateSetDefaultBrowser();
+
+    await ContentTaskUtils.waitForCondition(
+      () => ContentTaskUtils.isVisible(isDefaultPane),
+      "Browser is now default"
+    );
+
+    Assert.ok(
+      alwaysCheck.checked,
+      "'Always Check' is still checked because it's locked"
+    );
+    Assert.ok(
+      alwaysCheck.disabled,
+      "'Always Check is disabled because it's locked"
+    );
+    Assert.ok(
+      Services.prefs.getBoolPref("browser.shell.checkDefaultBrowser"),
+      "The pref is locked and so doesn't get changed"
+    );
+  });
+
+  Services.prefs.unlockPref("browser.shell.checkDefaultBrowser");
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function make_default_disabled_until_prefs_are_loaded() {
+  // Testcase with Firefox not set as the default browser
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, "about:preferences");
+  await test_with_mock_shellservice({ isDefault: false }, async function () {
+    let alwaysCheck = content.document.getElementById("alwaysCheckDefault");
+    Assert.ok(
+      !alwaysCheck.disabled,
+      "'Always Check' is enabled after default browser updated"
+    );
+  });
+  gBrowser.removeCurrentTab();
+
+  // Testcase with Firefox set as the default browser
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, "about:preferences");
+  await test_with_mock_shellservice({ isDefault: true }, async function () {
+    let alwaysCheck = content.document.getElementById("alwaysCheckDefault");
+    Assert.ok(
+      alwaysCheck.disabled,
+      "'Always Check' is still disabled after default browser updated"
+    );
+  });
+  gBrowser.removeCurrentTab();
+});
+
+registerCleanupFunction(function () {
+  Services.prefs.unlockPref("browser.shell.checkDefaultBrowser");
+  Services.prefs.setBoolPref(
+    "browser.shell.checkDefaultBrowser",
+    CHECK_DEFAULT_INITIAL
+  );
+});
+
+async function test_with_mock_shellservice(options, testFn) {
+  await SpecialPowers.spawn(
+    gBrowser.selectedBrowser,
+    [options],
+    async function (contentOptions) {
+      let doc = content.document;
+      let win = doc.defaultView;
+      win.oldShellService = win.getShellService();
+      let mockShellService = {
+        _isDefault: false,
+        isDefaultBrowser() {
+          return this._isDefault;
+        },
+        async setDefaultBrowser() {
+          this._isDefault = true;
+        },
+      };
+      win.getShellService = function () {
+        return mockShellService;
+      };
+      mockShellService._isDefault = contentOptions.isDefault;
+      win.gMainPane.updateSetDefaultBrowser();
+    }
+  );
+
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], testFn);
+
+  Services.prefs.setBoolPref(
+    "browser.shell.checkDefaultBrowser",
+    CHECK_DEFAULT_INITIAL
+  );
+}
diff --git a/browser/components/preferences/tests/browser_engines.js b/browser/components/preferences/tests/browser_engines.js
new file mode 100644
index 0000000000..aa681e7039
--- /dev/null
+++ b/browser/components/preferences/tests/browser_engines.js
@@ -0,0 +1,141 @@
+const { SearchTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/SearchTestUtils.sys.mjs"
+);
+
+SearchTestUtils.init(this);
+
+function getCellText(tree, i, cellName) {
+  return tree.view.getCellText(i, tree.columns.getNamedColumn(cellName));
+}
+
+add_setup(async function () {
+  await SearchTestUtils.installSearchExtension({
+    keyword: ["testing", "customkeyword"],
+    search_url: "https://example.com/engine1",
+    search_url_get_params: "search={searchTerms}",
+  });
+});
+
+add_task(async function test_engine_list() {
+  let prefs = await openPreferencesViaOpenPreferencesAPI("search", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneSearch", "Search pane is selected by default");
+  let doc = gBrowser.contentDocument;
+
+  let tree = doc.querySelector("#engineList");
+  ok(
+    !tree.hidden,
+    "The search engine list should be visible when Search is requested"
+  );
+
+  // Check for default search engines to be displayed in the engineList
+  let defaultEngines = await Services.search.getAppProvidedEngines();
+  for (let i = 0; i < defaultEngines.length; i++) {
+    let engine = defaultEngines[i];
+    is(
+      getCellText(tree, i, "engineName"),
+      engine.name,
+      "Default search engine " + engine.name + " displayed correctly"
+    );
+  }
+
+  let customEngineIndex = defaultEngines.length;
+  is(
+    getCellText(tree, customEngineIndex, "engineKeyword"),
+    "testing, customkeyword",
+    "Show internal aliases"
+  );
+
+  // Scroll the treeview into view since mouse operations
+  // off screen can act confusingly.
+  tree.scrollIntoView();
+  let rect = tree.getCoordsForCellItem(
+    customEngineIndex,
+    tree.columns.getNamedColumn("engineKeyword"),
+    "text"
+  );
+  let x = rect.x + rect.width / 2;
+  let y = rect.y + rect.height / 2;
+  let win = tree.ownerGlobal;
+
+  let promise = BrowserTestUtils.waitForEvent(tree, "dblclick");
+  EventUtils.synthesizeMouse(tree.body, x, y, { clickCount: 1 }, win);
+  EventUtils.synthesizeMouse(tree.body, x, y, { clickCount: 2 }, win);
+  await promise;
+
+  EventUtils.sendString("newkeyword");
+  EventUtils.sendKey("RETURN");
+
+  await TestUtils.waitForCondition(() => {
+    return (
+      getCellText(tree, customEngineIndex, "engineKeyword") ===
+      "newkeyword, testing, customkeyword"
+    );
+  });
+
+  // Avoid duplicated keywords
+  tree.view.setCellText(
+    0,
+    tree.columns.getNamedColumn("engineKeyword"),
+    "keyword"
+  );
+  tree.view.setCellText(
+    1,
+    tree.columns.getNamedColumn("engineKeyword"),
+    "keyword"
+  );
+  isnot(
+    getCellText(tree, 1, "engineKeyword"),
+    "keyword",
+    "Do not allow duplicated keywords"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function test_remove_button_disabled_state() {
+  let prefs = await openPreferencesViaOpenPreferencesAPI("search", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneSearch", "Search pane is selected by default");
+  let doc = gBrowser.contentDocument;
+
+  let tree = doc.querySelector("#engineList");
+  ok(
+    !tree.hidden,
+    "The search engine list should be visible when Search is requested"
+  );
+
+  let defaultEngines = await Services.search.getAppProvidedEngines();
+  for (let i = 0; i < defaultEngines.length; i++) {
+    let engine = defaultEngines[i];
+
+    let isDefaultSearchEngine =
+      engine.name == Services.search.defaultEngine.name ||
+      engine.name == Services.search.defaultPrivateEngine.name;
+
+    tree.scrollIntoView();
+    let rect = tree.getCoordsForCellItem(
+      i,
+      tree.columns.getNamedColumn("engineName"),
+      "text"
+    );
+    let x = rect.x + rect.width / 2;
+    let y = rect.y + rect.height / 2;
+    let win = tree.ownerGlobal;
+
+    let promise = BrowserTestUtils.waitForEvent(tree, "click");
+    EventUtils.synthesizeMouse(tree.body, x, y, { clickCount: 1 }, win);
+    await promise;
+
+    let removeButton = doc.querySelector("#removeEngineButton");
+    is(
+      removeButton.disabled,
+      isDefaultSearchEngine,
+      "Remove button is in correct disable state"
+    );
+  }
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_ensure_prefs_bindings_initted.js b/browser/components/preferences/tests/browser_ensure_prefs_bindings_initted.js
new file mode 100644
index 0000000000..e193181200
--- /dev/null
+++ b/browser/components/preferences/tests/browser_ensure_prefs_bindings_initted.js
@@ -0,0 +1,40 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/*
+ * Check that panes that aren't the default have their bindings initialized
+ * and 'preference' attributes are processed correctly.
+ */
+add_task(async function test_prefs_bindings_initted() {
+  await openPreferencesViaOpenPreferencesAPI("general", { leaveOpen: true });
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let prefReader = doc.ownerGlobal.Preferences;
+  let prefBasedCheckboxes = Array.from(
+    doc.querySelectorAll("checkbox[preference]")
+  );
+
+  // Then check all the preferences:
+  for (let checkbox of prefBasedCheckboxes) {
+    let pref = checkbox.getAttribute("preference");
+    if (Services.prefs.getPrefType(pref) == Services.prefs.PREF_BOOL) {
+      info(`Waiting for checkbox to match pref ${pref}`);
+      // Ensure the task setting up prefs has run.
+      await BrowserTestUtils.waitForMutationCondition(
+        checkbox,
+        { attributeFilter: ["checked"] },
+        () => checkbox.checked == prefReader.get(pref).value
+      );
+      is(
+        checkbox.checked,
+        prefReader.get(pref).value,
+        `Checkbox value should match preference (${pref}).`
+      );
+      // Ignore all other types. The mapping is normally non-trivial and done
+      // using syncfrompreference handlers in JS.
+    }
+  }
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_etp_exceptions_dialog.js b/browser/components/preferences/tests/browser_etp_exceptions_dialog.js
new file mode 100644
index 0000000000..349223995c
--- /dev/null
+++ b/browser/components/preferences/tests/browser_etp_exceptions_dialog.js
@@ -0,0 +1,96 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const PERMISSIONS_URL =
+  "chrome://browser/content/preferences/dialogs/permissions.xhtml";
+
+const TRACKING_URL = "https://example.com";
+
+async function openETPExceptionsDialog(doc) {
+  let exceptionsButton = doc.getElementById("trackingProtectionExceptions");
+  ok(exceptionsButton, "trackingProtectionExceptions button found");
+  let dialogPromise = promiseLoadSubDialog(PERMISSIONS_URL);
+  exceptionsButton.click();
+  let dialog = await dialogPromise;
+  return dialog;
+}
+
+async function addETPPermission(doc) {
+  let dialog = await openETPExceptionsDialog(doc);
+  let url = dialog.document.getElementById("url");
+  let buttonDisableETP = dialog.document.getElementById("btnDisableETP");
+  let permissionsBox = dialog.document.getElementById("permissionsBox");
+  let currentPermissions = permissionsBox.itemCount;
+
+  url.value = TRACKING_URL;
+  url.dispatchEvent(new Event("input", { bubbles: true }));
+  is(
+    buttonDisableETP.hasAttribute("disabled"),
+    false,
+    "Disable ETP button is selectable after url is entered"
+  );
+  buttonDisableETP.click();
+
+  // Website is listed
+  is(
+    permissionsBox.itemCount,
+    currentPermissions + 1,
+    "Website added in url should be in the list"
+  );
+  let saveButton = dialog.document.querySelector("dialog").getButton("accept");
+  saveButton.click();
+  BrowserTestUtils.waitForEvent(dialog, "unload");
+}
+
+async function removeETPPermission(doc) {
+  let dialog = await openETPExceptionsDialog(doc);
+  let permissionsBox = dialog.document.getElementById("permissionsBox");
+  let elements = permissionsBox.getElementsByAttribute("origin", TRACKING_URL);
+  // Website is listed
+  ok(permissionsBox.itemCount, "List is not empty");
+  permissionsBox.selectItem(elements[0]);
+  let removePermissionButton =
+    dialog.document.getElementById("removePermission");
+  is(
+    removePermissionButton.hasAttribute("disabled"),
+    false,
+    "The button should be clickable to remove selected item"
+  );
+  removePermissionButton.click();
+
+  let saveButton = dialog.document.querySelector("dialog").getButton("accept");
+  saveButton.click();
+  BrowserTestUtils.waitForEvent(dialog, "unload");
+}
+
+async function checkShieldIcon(shieldIcon) {
+  // Open the website and check that the tracking protection icon is enabled/disabled
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, TRACKING_URL);
+  let icon = document.getElementById("tracking-protection-icon");
+  is(
+    gBrowser.ownerGlobal
+      .getComputedStyle(icon)
+      .getPropertyValue("list-style-image"),
+    shieldIcon,
+    `The tracking protection icon shows the icon ${shieldIcon}`
+  );
+  BrowserTestUtils.removeTab(tab);
+}
+
+// test adds and removes an ETP permission via the about:preferences#privacy and checks if the ProtectionsUI shield icon resembles the state
+add_task(async function ETPPermissionSyncedFromPrivacyPane() {
+  await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+  let win = gBrowser.selectedBrowser.contentWindow;
+  let doc = win.document;
+  await addETPPermission(doc);
+  await checkShieldIcon(
+    `url("chrome://browser/skin/tracking-protection-disabled.svg")`
+  );
+  await removeETPPermission(doc);
+  await checkShieldIcon(`url("chrome://browser/skin/tracking-protection.svg")`);
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_experimental_features.js b/browser/components/preferences/tests/browser_experimental_features.js
new file mode 100644
index 0000000000..cecbb60893
--- /dev/null
+++ b/browser/components/preferences/tests/browser_experimental_features.js
@@ -0,0 +1,74 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function testPrefRequired() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.experimental", false]],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("paneHome", { leaveOpen: true });
+  let doc = gBrowser.contentDocument;
+
+  let experimentalCategory = doc.getElementById("category-experimental");
+  ok(experimentalCategory, "The category exists");
+  ok(experimentalCategory.hidden, "The category is hidden");
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function testCanOpenWithPref() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.experimental", true]],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("paneHome", { leaveOpen: true });
+  let doc = gBrowser.contentDocument;
+
+  let experimentalCategory = doc.getElementById("category-experimental");
+  ok(experimentalCategory, "The category exists");
+  ok(!experimentalCategory.hidden, "The category is not hidden");
+
+  let categoryHeader = await TestUtils.waitForCondition(
+    () => doc.getElementById("firefoxExperimentalCategory"),
+    "Waiting for experimental features category to get initialized"
+  );
+  ok(
+    categoryHeader.hidden,
+    "The category header should be hidden when Home is selected"
+  );
+
+  EventUtils.synthesizeMouseAtCenter(experimentalCategory, {}, doc.ownerGlobal);
+  await TestUtils.waitForCondition(
+    () => !categoryHeader.hidden,
+    "Waiting until category is visible"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function testSearchFindsExperiments() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.experimental", true]],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("paneHome", { leaveOpen: true });
+  let doc = gBrowser.contentDocument;
+
+  let experimentalCategory = doc.getElementById("category-experimental");
+  ok(experimentalCategory, "The category exists");
+  ok(!experimentalCategory.hidden, "The category is not hidden");
+
+  await TestUtils.waitForCondition(
+    () => doc.getElementById("firefoxExperimentalCategory"),
+    "Waiting for experimental features category to get initialized"
+  );
+  await evaluateSearchResults(
+    "advanced configuration",
+    ["pane-experimental-featureGates"],
+    /* include experiments */ true
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_experimental_features_filter.js b/browser/components/preferences/tests/browser_experimental_features_filter.js
new file mode 100644
index 0000000000..d3ed10d1a9
--- /dev/null
+++ b/browser/components/preferences/tests/browser_experimental_features_filter.js
@@ -0,0 +1,193 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// This test verifies that searching filters the features to just that subset that
+// contains the search terms.
+add_task(async function testFilterFeatures() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.experimental", true]],
+  });
+
+  // Add a number of test features.
+  const server = new DefinitionServer();
+  let definitions = [
+    {
+      id: "test-featureA",
+      preference: "test.featureA",
+      title: "Experimental Feature 1",
+      description: "This is a fun experimental feature you can enable",
+      result: true,
+    },
+    {
+      id: "test-featureB",
+      preference: "test.featureB",
+      title: "Experimental Thing 2",
+      description: "This is a very boring experimental tool",
+      result: false,
+    },
+    {
+      id: "test-featureC",
+      preference: "test.featureC",
+      title: "Experimental Thing 3",
+      description: "This is a fun experimental feature for you can enable",
+      result: true,
+    },
+    {
+      id: "test-featureD",
+      preference: "test.featureD",
+      title: "Experimental Thing 4",
+      description: "This is a not a checkbox that you should be enabling",
+      result: false,
+    },
+  ];
+  for (let { id, preference } of definitions) {
+    server.addDefinition({ id, preference, isPublic: true });
+  }
+
+  await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    `about:preferences?definitionsUrl=${encodeURIComponent(
+      server.definitionsUrl
+    )}#paneExperimental`
+  );
+  let doc = gBrowser.contentDocument;
+
+  await TestUtils.waitForCondition(
+    () => doc.getElementById(definitions[definitions.length - 1].id),
+    "wait for the first public feature to get added to the DOM"
+  );
+
+  // Manually modify the labels of the features that were just added, so that the test
+  // can rely on consistent search terms.
+  for (let definition of definitions) {
+    let mainItem = doc.getElementById(definition.id);
+    mainItem.label = definition.title;
+    mainItem.removeAttribute("data-l10n-id");
+    let descItem = doc.getElementById(definition.id + "-description");
+    descItem.textContent = definition.description;
+    descItem.removeAttribute("data-l10n-id");
+  }
+
+  // First, check that all of the items are visible by default.
+  for (let definition of definitions) {
+    checkVisibility(
+      doc.getElementById(definition.id),
+      true,
+      `${definition.id} should be initially visible`
+    );
+  }
+
+  // After searching, only a subset should be visible.
+  await enterSearch(doc, "feature");
+
+  for (let definition of definitions) {
+    checkVisibility(
+      doc.getElementById(definition.id),
+      definition.result,
+      `${definition.id} should be ${
+        definition.result ? "visible" : "hidden"
+      } after first search`
+    );
+    info("Text for item was: " + doc.getElementById(definition.id).textContent);
+  }
+
+  // Further restrict the search to only a single item.
+  await enterSearch(doc, " you");
+
+  let shouldBeVisible = true;
+  for (let definition of definitions) {
+    checkVisibility(
+      doc.getElementById(definition.id),
+      shouldBeVisible,
+      `${definition.id} should be ${
+        shouldBeVisible ? "visible" : "hidden"
+      } after further search`
+    );
+    shouldBeVisible = false;
+  }
+
+  // Reset the search entirely.
+  let searchInput = doc.getElementById("searchInput");
+  searchInput.value = "";
+  searchInput.doCommand();
+
+  // Clearing the search will go to the general pane so switch back to the experimental pane.
+  EventUtils.synthesizeMouseAtCenter(
+    doc.getElementById("category-experimental"),
+    {},
+    gBrowser.contentWindow
+  );
+
+  for (let definition of definitions) {
+    checkVisibility(
+      doc.getElementById(definition.id),
+      true,
+      `${definition.id} should be visible after search cleared`
+    );
+  }
+
+  // Simulate entering a search and then clicking one of the category labels. The search
+  // should reset each time.
+  for (let category of ["category-search", "category-experimental"]) {
+    await enterSearch(doc, "feature");
+
+    for (let definition of definitions) {
+      checkVisibility(
+        doc.getElementById(definition.id),
+        definition.result,
+        `${definition.id} should be ${
+          definition.result ? "visible" : "hidden"
+        } after next search`
+      );
+    }
+
+    // Check that switching to a non-find-in-page category changes item
+    // visibility appropriately.
+    EventUtils.synthesizeMouseAtCenter(
+      doc.getElementById(category),
+      {},
+      gBrowser.contentWindow
+    );
+
+    // Ensure that async passes of localization and any code waiting for
+    // those passes have finished running.
+    await new Promise(r =>
+      requestAnimationFrame(() => requestAnimationFrame(r))
+    );
+    let shouldShow = category == "category-experimental";
+    for (let definition of definitions) {
+      checkVisibility(
+        doc.getElementById(definition.id),
+        shouldShow,
+        `${definition.id} should be ${
+          shouldShow ? "visible" : "hidden"
+        } after category change to ${category}`
+      );
+    }
+  }
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+function checkVisibility(element, expected, desc) {
+  return expected
+    ? is_element_visible(element, desc)
+    : is_element_hidden(element, desc);
+}
+
+function enterSearch(doc, query) {
+  let searchInput = doc.getElementById("searchInput");
+  searchInput.focus();
+
+  let searchCompletedPromise = BrowserTestUtils.waitForEvent(
+    gBrowser.contentWindow,
+    "PreferencesSearchCompleted",
+    evt => evt.detail == query
+  );
+
+  EventUtils.sendString(query);
+
+  return searchCompletedPromise;
+}
diff --git a/browser/components/preferences/tests/browser_experimental_features_hidden_when_not_public.js b/browser/components/preferences/tests/browser_experimental_features_hidden_when_not_public.js
new file mode 100644
index 0000000000..e1e2adced9
--- /dev/null
+++ b/browser/components/preferences/tests/browser_experimental_features_hidden_when_not_public.js
@@ -0,0 +1,86 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function testNonPublicFeaturesShouldntGetDisplayed() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.experimental", true]],
+  });
+
+  const server = new DefinitionServer();
+  let definitions = [
+    { id: "test-featureA", isPublic: true, preference: "test.feature.a" },
+    { id: "test-featureB", isPublic: false, preference: "test.feature.b" },
+    { id: "test-featureC", isPublic: true, preference: "test.feature.c" },
+  ];
+  for (let { id, isPublic, preference } of definitions) {
+    server.addDefinition({ id, isPublic, preference });
+  }
+  await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    `about:preferences?definitionsUrl=${encodeURIComponent(
+      server.definitionsUrl
+    )}#paneExperimental`
+  );
+  let doc = gBrowser.contentDocument;
+
+  await TestUtils.waitForCondition(
+    () => doc.getElementById(definitions.find(d => d.isPublic).id),
+    "wait for the first public feature to get added to the DOM"
+  );
+
+  for (let definition of definitions) {
+    is(
+      !!doc.getElementById(definition.id),
+      definition.isPublic,
+      "feature should only be in DOM if it's public: " + definition.id
+    );
+  }
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function testNonPublicFeaturesShouldntGetDisplayed() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.preferences.experimental", true],
+      ["browser.preferences.experimental.hidden", false],
+    ],
+  });
+
+  const server = new DefinitionServer();
+  server.addDefinition({
+    id: "test-hidden",
+    isPublic: false,
+    preference: "test.feature.hidden",
+  });
+  await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    `about:preferences?definitionsUrl=${encodeURIComponent(
+      server.definitionsUrl
+    )}#paneExperimental`
+  );
+  let doc = gBrowser.contentDocument;
+
+  await TestUtils.waitForCondition(
+    () => doc.getElementById("category-experimental").hidden,
+    "Wait for Experimental Features section to get hidden"
+  );
+
+  ok(
+    doc.getElementById("category-experimental").hidden,
+    "Experimental Features section should be hidden when all features are hidden"
+  );
+  ok(
+    !doc.getElementById("firefoxExperimentalCategory"),
+    "Experimental Features header should not exist when all features are hidden"
+  );
+  is(
+    doc.querySelector(".category[selected]").id,
+    "category-general",
+    "When the experimental features section is hidden, navigating to #experimental should redirect to #general"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_experimental_features_resetall.js b/browser/components/preferences/tests/browser_experimental_features_resetall.js
new file mode 100644
index 0000000000..5f19ba5a0c
--- /dev/null
+++ b/browser/components/preferences/tests/browser_experimental_features_resetall.js
@@ -0,0 +1,112 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// It doesn't matter what two preferences are used here, as long as the first is a built-in
+// one that defaults to false and the second defaults to true.
+const KNOWN_PREF_1 = "browser.display.use_system_colors";
+const KNOWN_PREF_2 = "browser.autofocus";
+
+// This test verifies that pressing the reset all button for experimental features
+// resets all of the checkboxes to their default state.
+add_task(async function testResetAll() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.preferences.experimental", true],
+      ["test.featureA", false],
+      ["test.featureB", true],
+      [KNOWN_PREF_1, false],
+      [KNOWN_PREF_2, true],
+    ],
+  });
+
+  // Add a number of test features.
+  const server = new DefinitionServer();
+  let definitions = [
+    {
+      id: "test-featureA",
+      preference: "test.featureA",
+      defaultValue: false,
+    },
+    {
+      id: "test-featureB",
+      preference: "test.featureB",
+      defaultValue: true,
+    },
+    {
+      id: "test-featureC",
+      preference: KNOWN_PREF_1,
+      defaultValue: false,
+    },
+    {
+      id: "test-featureD",
+      preference: KNOWN_PREF_2,
+      defaultValue: true,
+    },
+  ];
+  for (let { id, preference, defaultValue } of definitions) {
+    server.addDefinition({ id, preference, defaultValue, isPublic: true });
+  }
+
+  await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    `about:preferences?definitionsUrl=${encodeURIComponent(
+      server.definitionsUrl
+    )}#paneExperimental`
+  );
+  let doc = gBrowser.contentDocument;
+
+  await TestUtils.waitForCondition(
+    () => doc.getElementById(definitions[definitions.length - 1].id),
+    "wait for the first public feature to get added to the DOM"
+  );
+
+  // Check the initial state of each feature.
+  ok(!Services.prefs.getBoolPref("test.featureA"), "initial state A");
+  ok(Services.prefs.getBoolPref("test.featureB"), "initial state B");
+  ok(!Services.prefs.getBoolPref(KNOWN_PREF_1), "initial state C");
+  ok(Services.prefs.getBoolPref(KNOWN_PREF_2), "initial state D");
+
+  // Modify the state of some of the features.
+  doc.getElementById("test-featureC").click();
+  doc.getElementById("test-featureD").click();
+  ok(!Services.prefs.getBoolPref("test.featureA"), "modified state A");
+  ok(Services.prefs.getBoolPref("test.featureB"), "modified state B");
+  ok(Services.prefs.getBoolPref(KNOWN_PREF_1), "modified state C");
+  ok(!Services.prefs.getBoolPref(KNOWN_PREF_2), "modified state D");
+
+  // State after reset.
+  let prefChangedPromise = new Promise(resolve => {
+    Services.prefs.addObserver(KNOWN_PREF_2, function observer() {
+      Services.prefs.removeObserver(KNOWN_PREF_2, observer);
+      resolve();
+    });
+  });
+  doc.getElementById("experimentalCategory-reset").click();
+  await prefChangedPromise;
+
+  // The preferences will be reset to the default value for the feature.
+  ok(!Services.prefs.getBoolPref("test.featureA"), "after reset state A");
+  ok(Services.prefs.getBoolPref("test.featureB"), "after reset state B");
+  ok(!Services.prefs.getBoolPref(KNOWN_PREF_1), "after reset state C");
+  ok(Services.prefs.getBoolPref(KNOWN_PREF_2), "after reset state D");
+  ok(
+    !doc.getElementById("test-featureA").checked,
+    "after reset checkbox state A"
+  );
+  ok(
+    doc.getElementById("test-featureB").checked,
+    "after reset checkbox state B"
+  );
+  ok(
+    !doc.getElementById("test-featureC").checked,
+    "after reset checkbox state C"
+  );
+  ok(
+    doc.getElementById("test-featureD").checked,
+    "after reset checkbox state D"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_extension_controlled.js b/browser/components/preferences/tests/browser_extension_controlled.js
new file mode 100644
index 0000000000..d187af5b7d
--- /dev/null
+++ b/browser/components/preferences/tests/browser_extension_controlled.js
@@ -0,0 +1,1443 @@
+/* eslint-env webextensions */
+
+const PROXY_PREF = "network.proxy.type";
+const HOMEPAGE_URL_PREF = "browser.startup.homepage";
+const HOMEPAGE_OVERRIDE_KEY = "homepage_override";
+const URL_OVERRIDES_TYPE = "url_overrides";
+const NEW_TAB_KEY = "newTabURL";
+const PREF_SETTING_TYPE = "prefs";
+
+ChromeUtils.defineESModuleGetters(this, {
+  AboutNewTab: "resource:///modules/AboutNewTab.sys.mjs",
+  ExtensionSettingsStore:
+    "resource://gre/modules/ExtensionSettingsStore.sys.mjs",
+});
+
+XPCOMUtils.defineLazyPreferenceGetter(this, "proxyType", PROXY_PREF);
+
+const { AddonTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/AddonTestUtils.sys.mjs"
+);
+AddonTestUtils.initMochitest(this);
+
+const { ExtensionPreferencesManager } = ChromeUtils.importESModule(
+  "resource://gre/modules/ExtensionPreferencesManager.sys.mjs"
+);
+
+const TEST_DIR = gTestPath.substr(0, gTestPath.lastIndexOf("/"));
+const CHROME_URL_ROOT = TEST_DIR + "/";
+const PERMISSIONS_URL =
+  "chrome://browser/content/preferences/dialogs/sitePermissions.xhtml";
+let sitePermissionsDialog;
+
+function getSupportsFile(path) {
+  let cr = Cc["@mozilla.org/chrome/chrome-registry;1"].getService(
+    Ci.nsIChromeRegistry
+  );
+  let uri = Services.io.newURI(CHROME_URL_ROOT + path);
+  let fileurl = cr.convertChromeURL(uri);
+  return fileurl.QueryInterface(Ci.nsIFileURL);
+}
+
+function waitForMessageChange(
+  element,
+  cb,
+  opts = { attributes: true, attributeFilter: ["hidden"] }
+) {
+  return waitForMutation(element, opts, cb);
+}
+
+function getElement(id, doc = gBrowser.contentDocument) {
+  return doc.getElementById(id);
+}
+
+function waitForMessageHidden(messageId, doc) {
+  return waitForMessageChange(
+    getElement(messageId, doc),
+    target => target.hidden
+  );
+}
+
+function waitForMessageShown(messageId, doc) {
+  return waitForMessageChange(
+    getElement(messageId, doc),
+    target => !target.hidden
+  );
+}
+
+function waitForEnableMessage(messageId, doc) {
+  return waitForMessageChange(
+    getElement(messageId, doc),
+    target => target.classList.contains("extension-controlled-disabled"),
+    { attributeFilter: ["class"], attributes: true }
+  );
+}
+
+function waitForMessageContent(messageId, l10nId, doc) {
+  return waitForMessageChange(
+    getElement(messageId, doc),
+    target => doc.l10n.getAttributes(target).id === l10nId,
+    { childList: true }
+  );
+}
+
+async function openNotificationsPermissionDialog() {
+  let dialogOpened = promiseLoadSubDialog(PERMISSIONS_URL);
+
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], function () {
+    let doc = content.document;
+    let settingsButton = doc.getElementById("notificationSettingsButton");
+    settingsButton.click();
+  });
+
+  sitePermissionsDialog = await dialogOpened;
+  await sitePermissionsDialog.document.mozSubdialogReady;
+}
+
+async function disableExtensionViaClick(labelId, disableButtonId, doc) {
+  let controlledLabel = doc.getElementById(labelId);
+
+  let enableMessageShown = waitForEnableMessage(labelId, doc);
+  doc.getElementById(disableButtonId).click();
+  await enableMessageShown;
+
+  let controlledDescription = controlledLabel.querySelector("description");
+  is(
+    doc.l10n.getAttributes(controlledDescription.querySelector("label")).id,
+    "extension-controlled-enable",
+    "The user is notified of how to enable the extension again."
+  );
+
+  // The user can dismiss the enable instructions.
+  let hidden = waitForMessageHidden(labelId, doc);
+  controlledLabel.querySelector("image:last-of-type").click();
+  await hidden;
+}
+
+async function reEnableExtension(addon, labelId) {
+  let controlledMessageShown = waitForMessageShown(labelId);
+  await addon.enable();
+  await controlledMessageShown;
+}
+
+add_task(async function testExtensionControlledHomepage() {
+  const ADDON_ID = "@set_homepage";
+  const SECOND_ADDON_ID = "@second_set_homepage";
+
+  await openPreferencesViaOpenPreferencesAPI("paneHome", { leaveOpen: true });
+  let homepagePref = () => Services.prefs.getCharPref(HOMEPAGE_URL_PREF);
+  let originalHomepagePref = homepagePref();
+  is(
+    gBrowser.currentURI.spec,
+    "about:preferences#home",
+    "#home should be in the URI for about:preferences"
+  );
+  let doc = gBrowser.contentDocument;
+  let homeModeEl = doc.getElementById("homeMode");
+  let customSettingsSection = doc.getElementById("customSettings");
+
+  is(homeModeEl.itemCount, 3, "The menu list starts with 3 options");
+
+  let promise = TestUtils.waitForCondition(
+    () => homeModeEl.itemCount === 4,
+    "wait for the addon option to be added as an option in the menu list"
+  );
+  let extension = ExtensionTestUtils.loadExtension({
+    useAddonManager: "permanent",
+    manifest: {
+      version: "1.0",
+      name: "set_homepage",
+      browser_specific_settings: {
+        gecko: {
+          id: ADDON_ID,
+        },
+      },
+      chrome_settings_overrides: { homepage: "/home.html" },
+    },
+  });
+  await extension.startup();
+  await promise;
+
+  // The homepage is set to the default and the custom settings section is hidden
+  is(homeModeEl.disabled, false, "The homepage menulist is enabled");
+  is(
+    customSettingsSection.hidden,
+    true,
+    "The custom settings element is hidden"
+  );
+
+  let addon = await AddonManager.getAddonByID(ADDON_ID);
+  is(
+    homeModeEl.value,
+    addon.id,
+    "the home select menu's value is set to the addon"
+  );
+
+  promise = TestUtils.waitForPrefChange(HOMEPAGE_URL_PREF);
+  // Set the Menu to the default value
+  homeModeEl.value = "0";
+  homeModeEl.dispatchEvent(new Event("command"));
+  await promise;
+  is(homepagePref(), originalHomepagePref, "homepage is set back to default");
+  let levelOfControl = await ExtensionPreferencesManager.getLevelOfControl(
+    addon.id,
+    HOMEPAGE_OVERRIDE_KEY,
+    PREF_SETTING_TYPE
+  );
+  is(
+    levelOfControl,
+    "not_controllable",
+    "getLevelOfControl returns not_controllable."
+  );
+  let setting = await ExtensionPreferencesManager.getSetting(
+    HOMEPAGE_OVERRIDE_KEY
+  );
+  ok(!setting.value, "the setting is not set.");
+
+  promise = TestUtils.waitForPrefChange(HOMEPAGE_URL_PREF);
+  // Set the menu to the addon value
+  homeModeEl.value = ADDON_ID;
+  homeModeEl.dispatchEvent(new Event("command"));
+  await promise;
+  ok(
+    homepagePref().startsWith("moz-extension") &&
+      homepagePref().endsWith("home.html"),
+    "Home url should be provided by the extension."
+  );
+  levelOfControl = await ExtensionPreferencesManager.getLevelOfControl(
+    addon.id,
+    HOMEPAGE_OVERRIDE_KEY,
+    PREF_SETTING_TYPE
+  );
+  is(
+    levelOfControl,
+    "controlled_by_this_extension",
+    "getLevelOfControl returns controlled_by_this_extension."
+  );
+  setting = await ExtensionPreferencesManager.getSetting(HOMEPAGE_OVERRIDE_KEY);
+  ok(
+    setting.value.startsWith("moz-extension") &&
+      setting.value.endsWith("home.html"),
+    "The setting value is the same as the extension."
+  );
+
+  // Add a second extension, ensure it is added to the menulist and selected.
+  promise = TestUtils.waitForCondition(
+    () => homeModeEl.itemCount == 5,
+    "addon option is added as an option in the menu list"
+  );
+  let secondExtension = ExtensionTestUtils.loadExtension({
+    useAddonManager: "permanent",
+    manifest: {
+      version: "1.0",
+      name: "second_set_homepage",
+      browser_specific_settings: {
+        gecko: {
+          id: SECOND_ADDON_ID,
+        },
+      },
+      chrome_settings_overrides: { homepage: "/home2.html" },
+    },
+  });
+  await secondExtension.startup();
+  await promise;
+
+  let secondAddon = await AddonManager.getAddonByID(SECOND_ADDON_ID);
+  is(homeModeEl.value, SECOND_ADDON_ID, "home menulist is set to the add-on");
+
+  levelOfControl = await ExtensionPreferencesManager.getLevelOfControl(
+    secondAddon.id,
+    HOMEPAGE_OVERRIDE_KEY,
+    PREF_SETTING_TYPE
+  );
+  is(
+    levelOfControl,
+    "controlled_by_this_extension",
+    "getLevelOfControl returns controlled_by_this_extension."
+  );
+  setting = await ExtensionPreferencesManager.getSetting(HOMEPAGE_OVERRIDE_KEY);
+  ok(
+    setting.value.startsWith("moz-extension") &&
+      setting.value.endsWith("home2.html"),
+    "The setting value is the same as the extension."
+  );
+
+  promise = TestUtils.waitForCondition(
+    () => homeModeEl.itemCount == 4,
+    "addon option is no longer an option in the menu list after disable, even if it was not selected"
+  );
+  await addon.disable();
+  await promise;
+
+  // Ensure that re-enabling an addon adds it back to the menulist
+  promise = TestUtils.waitForCondition(
+    () => homeModeEl.itemCount == 5,
+    "addon option is added again to the menulist when enabled"
+  );
+  await addon.enable();
+  await promise;
+
+  promise = TestUtils.waitForCondition(
+    () => homeModeEl.itemCount == 4,
+    "addon option is no longer an option in the menu list after disable"
+  );
+  await secondAddon.disable();
+  await promise;
+
+  promise = TestUtils.waitForCondition(
+    () => homeModeEl.itemCount == 5,
+    "addon option is added again to the menulist when enabled"
+  );
+  await secondAddon.enable();
+  await promise;
+
+  promise = TestUtils.waitForCondition(
+    () => homeModeEl.itemCount == 3,
+    "addon options are no longer an option in the menu list after disabling all addons"
+  );
+  await secondAddon.disable();
+  await addon.disable();
+  await promise;
+
+  is(homeModeEl.value, "0", "addon option is not selected in the menu list");
+
+  levelOfControl = await ExtensionPreferencesManager.getLevelOfControl(
+    secondAddon.id,
+    HOMEPAGE_OVERRIDE_KEY,
+    PREF_SETTING_TYPE
+  );
+  is(
+    levelOfControl,
+    "controllable_by_this_extension",
+    "getLevelOfControl returns controllable_by_this_extension."
+  );
+  setting = await ExtensionPreferencesManager.getSetting(HOMEPAGE_OVERRIDE_KEY);
+  ok(!setting.value, "The setting value is back to default.");
+
+  // The homepage elements are reset to their original state.
+  is(homepagePref(), originalHomepagePref, "homepage is set back to default");
+  is(homeModeEl.disabled, false, "The homepage menulist is enabled");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  await extension.unload();
+  await secondExtension.unload();
+});
+
+add_task(async function testPrefLockedHomepage() {
+  const ADDON_ID = "@set_homepage";
+  await openPreferencesViaOpenPreferencesAPI("paneHome", { leaveOpen: true });
+  let doc = gBrowser.contentDocument;
+  is(
+    gBrowser.currentURI.spec,
+    "about:preferences#home",
+    "#home should be in the URI for about:preferences"
+  );
+
+  let homePagePref = "browser.startup.homepage";
+  let buttonPrefs = [
+    "pref.browser.homepage.disable_button.current_page",
+    "pref.browser.homepage.disable_button.bookmark_page",
+    "pref.browser.homepage.disable_button.restore_default",
+  ];
+  let homeModeEl = doc.getElementById("homeMode");
+  let homePageInput = doc.getElementById("homePageUrl");
+  let prefs = Services.prefs.getDefaultBranch(null);
+  let mutationOpts = { attributes: true, attributeFilter: ["disabled"] };
+
+  // Helper functions.
+  let getButton = pref =>
+    doc.querySelector(`.homepage-button[preference="${pref}"`);
+  let waitForAllMutations = () =>
+    Promise.all(
+      buttonPrefs
+        .map(pref => waitForMutation(getButton(pref), mutationOpts))
+        .concat([
+          waitForMutation(homeModeEl, mutationOpts),
+          waitForMutation(homePageInput, mutationOpts),
+        ])
+    );
+  let getHomepage = () =>
+    Services.prefs.getCharPref("browser.startup.homepage");
+
+  let originalHomepage = getHomepage();
+  let extensionHomepage = "https://developer.mozilla.org/";
+  let lockedHomepage = "http://www.yahoo.com";
+
+  let lockPrefs = () => {
+    buttonPrefs.forEach(pref => {
+      prefs.setBoolPref(pref, true);
+      prefs.lockPref(pref);
+    });
+    // Do the homepage last since that's the only pref that triggers a UI update.
+    prefs.setCharPref(homePagePref, lockedHomepage);
+    prefs.lockPref(homePagePref);
+  };
+  let unlockPrefs = () => {
+    buttonPrefs.forEach(pref => {
+      prefs.unlockPref(pref);
+      prefs.setBoolPref(pref, false);
+    });
+    // Do the homepage last since that's the only pref that triggers a UI update.
+    prefs.unlockPref(homePagePref);
+    prefs.setCharPref(homePagePref, originalHomepage);
+  };
+
+  // Lock or unlock prefs then wait for all mutations to finish.
+  // Expects a bool indicating if we should lock or unlock.
+  let waitForLockMutations = lock => {
+    let mutationsDone = waitForAllMutations();
+    if (lock) {
+      lockPrefs();
+    } else {
+      unlockPrefs();
+    }
+    return mutationsDone;
+  };
+
+  Assert.notEqual(
+    originalHomepage,
+    extensionHomepage,
+    "The extension will change the homepage"
+  );
+
+  // Install an extension that sets the homepage to MDN.
+  let promise = TestUtils.waitForPrefChange(HOMEPAGE_URL_PREF);
+  let extension = ExtensionTestUtils.loadExtension({
+    useAddonManager: "permanent",
+    manifest: {
+      version: "1.0",
+      name: "set_homepage",
+      browser_specific_settings: {
+        gecko: {
+          id: ADDON_ID,
+        },
+      },
+      chrome_settings_overrides: { homepage: "https://developer.mozilla.org/" },
+    },
+  });
+  await extension.startup();
+  await promise;
+
+  // Check that everything is still disabled, homepage didn't change.
+  is(
+    getHomepage(),
+    extensionHomepage,
+    "The reported homepage is set by the extension"
+  );
+  is(
+    homePageInput.value,
+    extensionHomepage,
+    "The homepage is set by the extension"
+  );
+
+  // Lock all of the prefs, wait for the UI to update.
+  await waitForLockMutations(true);
+
+  // Check that everything is now disabled.
+  is(getHomepage(), lockedHomepage, "The reported homepage is set by the pref");
+  is(homePageInput.value, lockedHomepage, "The homepage is set by the pref");
+  is(
+    homePageInput.disabled,
+    true,
+    "The homepage is disabed when the pref is locked"
+  );
+
+  buttonPrefs.forEach(pref => {
+    is(
+      getButton(pref).disabled,
+      true,
+      `The ${pref} button is disabled when locked`
+    );
+  });
+
+  let levelOfControl = await ExtensionPreferencesManager.getLevelOfControl(
+    ADDON_ID,
+    HOMEPAGE_OVERRIDE_KEY,
+    PREF_SETTING_TYPE
+  );
+  is(
+    levelOfControl,
+    "not_controllable",
+    "getLevelOfControl returns not_controllable, the pref is locked."
+  );
+
+  // Verify that the UI is selecting the extension's Id in the menulist
+  let unlockedPromise = TestUtils.waitForCondition(
+    () => homeModeEl.value == ADDON_ID,
+    "Homepage menulist value is equal to the extension ID"
+  );
+  // Unlock the prefs, wait for the UI to update.
+  unlockPrefs();
+  await unlockedPromise;
+
+  is(
+    homeModeEl.disabled,
+    false,
+    "the home select element is not disabled when the pref is not locked"
+  );
+  is(
+    homePageInput.disabled,
+    false,
+    "The homepage is enabled when the pref is unlocked"
+  );
+  is(
+    getHomepage(),
+    extensionHomepage,
+    "The homepage is reset to extension page"
+  );
+
+  levelOfControl = await ExtensionPreferencesManager.getLevelOfControl(
+    ADDON_ID,
+    HOMEPAGE_OVERRIDE_KEY,
+    PREF_SETTING_TYPE
+  );
+  is(
+    levelOfControl,
+    "controlled_by_this_extension",
+    "getLevelOfControl returns controlled_by_this_extension after prefs are unlocked."
+  );
+  let setting = await ExtensionPreferencesManager.getSetting(
+    HOMEPAGE_OVERRIDE_KEY
+  );
+  is(
+    setting.value,
+    extensionHomepage,
+    "The setting value is equal to the extensionHomepage."
+  );
+
+  // Uninstall the add-on.
+  promise = TestUtils.waitForPrefChange(HOMEPAGE_URL_PREF);
+  await extension.unload();
+  await promise;
+
+  setting = await ExtensionPreferencesManager.getSetting(HOMEPAGE_OVERRIDE_KEY);
+  ok(!setting, "The setting is gone after the addon is uninstalled.");
+
+  // Check that everything is now enabled again.
+  is(
+    getHomepage(),
+    originalHomepage,
+    "The reported homepage is reset to original value"
+  );
+  is(homePageInput.value, "", "The homepage is empty");
+  is(
+    homePageInput.disabled,
+    false,
+    "The homepage is enabled after clearing lock"
+  );
+  is(
+    homeModeEl.disabled,
+    false,
+    "Homepage menulist is enabled after clearing lock"
+  );
+  buttonPrefs.forEach(pref => {
+    is(
+      getButton(pref).disabled,
+      false,
+      `The ${pref} button is enabled when unlocked`
+    );
+  });
+
+  // Lock the prefs without an extension.
+  await waitForLockMutations(true);
+
+  // Check that everything is now disabled.
+  is(getHomepage(), lockedHomepage, "The reported homepage is set by the pref");
+  is(homePageInput.value, lockedHomepage, "The homepage is set by the pref");
+  is(
+    homePageInput.disabled,
+    true,
+    "The homepage is disabed when the pref is locked"
+  );
+  is(
+    homeModeEl.disabled,
+    true,
+    "Homepage menulist is disabled when pref is locked"
+  );
+  buttonPrefs.forEach(pref => {
+    is(
+      getButton(pref).disabled,
+      true,
+      `The ${pref} button is disabled when locked`
+    );
+  });
+
+  // Unlock the prefs without an extension.
+  await waitForLockMutations(false);
+
+  // Check that everything is enabled again.
+  is(
+    getHomepage(),
+    originalHomepage,
+    "The homepage is reset to the original value"
+  );
+  is(homePageInput.value, "", "The homepage is clear after being unlocked");
+  is(
+    homePageInput.disabled,
+    false,
+    "The homepage is enabled after clearing lock"
+  );
+  is(
+    homeModeEl.disabled,
+    false,
+    "Homepage menulist is enabled after clearing lock"
+  );
+  buttonPrefs.forEach(pref => {
+    is(
+      getButton(pref).disabled,
+      false,
+      `The ${pref} button is enabled when unlocked`
+    );
+  });
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function testExtensionControlledNewTab() {
+  const ADDON_ID = "@set_newtab";
+  const SECOND_ADDON_ID = "@second_set_newtab";
+  const DEFAULT_NEWTAB = "about:newtab";
+  const NEWTAB_CONTROLLED_PREF = "browser.newtab.extensionControlled";
+
+  await openPreferencesViaOpenPreferencesAPI("paneHome", { leaveOpen: true });
+  is(
+    gBrowser.currentURI.spec,
+    "about:preferences#home",
+    "#home should be in the URI for about:preferences"
+  );
+
+  let doc = gBrowser.contentDocument;
+  let newTabMenuList = doc.getElementById("newTabMode");
+  // The new tab page is set to the default.
+  is(AboutNewTab.newTabURL, DEFAULT_NEWTAB, "new tab is set to default");
+
+  let promise = TestUtils.waitForCondition(
+    () => newTabMenuList.itemCount == 3,
+    "addon option is added as an option in the menu list"
+  );
+  // Install an extension that will set the new tab page.
+  let extension = ExtensionTestUtils.loadExtension({
+    useAddonManager: "permanent",
+    manifest: {
+      version: "1.0",
+      name: "set_newtab",
+      browser_specific_settings: {
+        gecko: {
+          id: ADDON_ID,
+        },
+      },
+      chrome_url_overrides: { newtab: "/newtab.html" },
+    },
+  });
+  await extension.startup();
+
+  await promise;
+  let addon = await AddonManager.getAddonByID(ADDON_ID);
+
+  is(newTabMenuList.value, ADDON_ID, "New tab menulist is set to the add-on");
+
+  let levelOfControl = await ExtensionPreferencesManager.getLevelOfControl(
+    addon.id,
+    NEW_TAB_KEY,
+    URL_OVERRIDES_TYPE
+  );
+  is(
+    levelOfControl,
+    "controlled_by_this_extension",
+    "getLevelOfControl returns controlled_by_this_extension."
+  );
+  let setting = ExtensionSettingsStore.getSetting(
+    URL_OVERRIDES_TYPE,
+    NEW_TAB_KEY
+  );
+  ok(
+    setting.value.startsWith("moz-extension") &&
+      setting.value.endsWith("newtab.html"),
+    "The url_overrides is set by this extension"
+  );
+
+  promise = TestUtils.waitForPrefChange(NEWTAB_CONTROLLED_PREF);
+  // Set the menu to the default value
+  newTabMenuList.value = "0";
+  newTabMenuList.dispatchEvent(new Event("command"));
+  await promise;
+  let newTabPref = Services.prefs.getBoolPref(NEWTAB_CONTROLLED_PREF, false);
+  is(newTabPref, false, "the new tab is not controlled");
+
+  levelOfControl = await ExtensionPreferencesManager.getLevelOfControl(
+    addon.id,
+    NEW_TAB_KEY,
+    URL_OVERRIDES_TYPE
+  );
+  is(
+    levelOfControl,
+    "not_controllable",
+    "getLevelOfControl returns not_controllable."
+  );
+  setting = ExtensionSettingsStore.getSetting(URL_OVERRIDES_TYPE, NEW_TAB_KEY);
+  ok(!setting.value, "The url_overrides is not set by this extension");
+
+  promise = TestUtils.waitForPrefChange(NEWTAB_CONTROLLED_PREF);
+  // Set the menu to a the addon value
+  newTabMenuList.value = ADDON_ID;
+  newTabMenuList.dispatchEvent(new Event("command"));
+  await promise;
+  newTabPref = Services.prefs.getBoolPref(NEWTAB_CONTROLLED_PREF, false);
+  is(newTabPref, true, "the new tab is controlled");
+
+  // Add a second extension, ensure it is added to the menulist and selected.
+  promise = TestUtils.waitForCondition(
+    () => newTabMenuList.itemCount == 4,
+    "addon option is added as an option in the menu list"
+  );
+  let secondExtension = ExtensionTestUtils.loadExtension({
+    useAddonManager: "permanent",
+    manifest: {
+      version: "1.0",
+      name: "second_set_newtab",
+      browser_specific_settings: {
+        gecko: {
+          id: SECOND_ADDON_ID,
+        },
+      },
+      chrome_url_overrides: { newtab: "/newtab2.html" },
+    },
+  });
+  await secondExtension.startup();
+  await promise;
+  let secondAddon = await AddonManager.getAddonByID(SECOND_ADDON_ID);
+  is(
+    newTabMenuList.value,
+    SECOND_ADDON_ID,
+    "New tab menulist is set to the add-on"
+  );
+
+  levelOfControl = await ExtensionPreferencesManager.getLevelOfControl(
+    secondAddon.id,
+    NEW_TAB_KEY,
+    URL_OVERRIDES_TYPE
+  );
+  is(
+    levelOfControl,
+    "controlled_by_this_extension",
+    "getLevelOfControl returns controlled_by_this_extension."
+  );
+  setting = ExtensionSettingsStore.getSetting(URL_OVERRIDES_TYPE, NEW_TAB_KEY);
+  ok(
+    setting.value.startsWith("moz-extension") &&
+      setting.value.endsWith("newtab2.html"),
+    "The url_overrides is set by the second extension"
+  );
+
+  promise = TestUtils.waitForCondition(
+    () => newTabMenuList.itemCount == 3,
+    "addon option is no longer an option in the menu list after disable, even if it was not selected"
+  );
+  await addon.disable();
+  await promise;
+
+  // Ensure that re-enabling an addon adds it back to the menulist
+  promise = TestUtils.waitForCondition(
+    () => newTabMenuList.itemCount == 4,
+    "addon option is added again to the menulist when enabled"
+  );
+  await addon.enable();
+  await promise;
+
+  promise = TestUtils.waitForCondition(
+    () => newTabMenuList.itemCount == 3,
+    "addon option is no longer an option in the menu list after disable"
+  );
+  await secondAddon.disable();
+  await promise;
+
+  promise = TestUtils.waitForCondition(
+    () => newTabMenuList.itemCount == 4,
+    "addon option is added again to the menulist when enabled"
+  );
+  await secondAddon.enable();
+  await promise;
+
+  promise = TestUtils.waitForCondition(
+    () => newTabMenuList.itemCount == 2,
+    "addon options are all removed after disabling all"
+  );
+  await addon.disable();
+  await secondAddon.disable();
+  await promise;
+  is(
+    AboutNewTab.newTabURL,
+    DEFAULT_NEWTAB,
+    "new tab page is set back to default"
+  );
+
+  // Cleanup the tabs and add-on.
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  await extension.unload();
+  await secondExtension.unload();
+});
+
+add_task(async function testExtensionControlledWebNotificationsPermission() {
+  let manifest = {
+    manifest_version: 2,
+    name: "TestExtension",
+    version: "1.0",
+    description: "Testing WebNotificationsDisable",
+    browser_specific_settings: { gecko: { id: "@web_notifications_disable" } },
+    permissions: ["browserSettings"],
+    browser_action: {
+      default_title: "Testing",
+    },
+  };
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  await openNotificationsPermissionDialog();
+
+  let doc = sitePermissionsDialog.document;
+  let extensionControlledContent = doc.getElementById(
+    "browserNotificationsPermissionExtensionContent"
+  );
+
+  // Test that extension content is initially hidden.
+  ok(
+    extensionControlledContent.hidden,
+    "Extension content is initially hidden"
+  );
+
+  // Install an extension that will disable web notifications permission.
+  let messageShown = waitForMessageShown(
+    "browserNotificationsPermissionExtensionContent",
+    doc
+  );
+  let extension = ExtensionTestUtils.loadExtension({
+    manifest,
+    useAddonManager: "permanent",
+    background() {
+      browser.browserSettings.webNotificationsDisabled.set({ value: true });
+      browser.test.sendMessage("load-extension");
+    },
+  });
+  await extension.startup();
+  await extension.awaitMessage("load-extension");
+  await messageShown;
+
+  let controlledDesc = extensionControlledContent.querySelector("description");
+  Assert.deepEqual(
+    doc.l10n.getAttributes(controlledDesc),
+    {
+      id: "extension-controlling-web-notifications",
+      args: {
+        name: "TestExtension",
+      },
+    },
+    "The user is notified that an extension is controlling the web notifications permission"
+  );
+  is(
+    extensionControlledContent.hidden,
+    false,
+    "The extension controlled row is not hidden"
+  );
+
+  // Disable the extension.
+  doc.getElementById("disableNotificationsPermissionExtension").click();
+
+  // Verify the user is notified how to enable the extension.
+  await waitForEnableMessage(extensionControlledContent.id, doc);
+  is(
+    doc.l10n.getAttributes(controlledDesc.querySelector("label")).id,
+    "extension-controlled-enable",
+    "The user is notified of how to enable the extension again"
+  );
+
+  // Verify the enable message can be dismissed.
+  let hidden = waitForMessageHidden(extensionControlledContent.id, doc);
+  let dismissButton = controlledDesc.querySelector("image:last-of-type");
+  dismissButton.click();
+  await hidden;
+
+  // Verify that the extension controlled content in hidden again.
+  is(
+    extensionControlledContent.hidden,
+    true,
+    "The extension controlled row is now hidden"
+  );
+
+  await extension.unload();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function testExtensionControlledHomepageUninstalledAddon() {
+  async function checkHomepageEnabled() {
+    await openPreferencesViaOpenPreferencesAPI("paneHome", { leaveOpen: true });
+    let doc = gBrowser.contentDocument;
+    is(
+      gBrowser.currentURI.spec,
+      "about:preferences#home",
+      "#home should be in the URI for about:preferences"
+    );
+
+    // The homepage is enabled.
+    let homepageInput = doc.getElementById("homePageUrl");
+    is(homepageInput.disabled, false, "The homepage input is enabled");
+    is(homepageInput.value, "", "The homepage input is empty");
+
+    BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  }
+
+  await ExtensionSettingsStore.initialize();
+
+  // Verify the setting isn't reported as controlled and the inputs are enabled.
+  is(
+    ExtensionSettingsStore.getSetting("prefs", "homepage_override"),
+    null,
+    "The homepage_override is not set"
+  );
+  await checkHomepageEnabled();
+
+  // Disarm any pending writes before we modify the JSONFile directly.
+  await ExtensionSettingsStore._reloadFile(false);
+
+  // Write out a bad store file.
+  let storeData = {
+    prefs: {
+      homepage_override: {
+        initialValue: "",
+        precedenceList: [
+          {
+            id: "bad@mochi.test",
+            installDate: 1508802672,
+            value: "https://developer.mozilla.org",
+            enabled: true,
+          },
+        ],
+      },
+    },
+  };
+  let jsonFileName = "extension-settings.json";
+  let storePath = PathUtils.join(PathUtils.profileDir, jsonFileName);
+
+  await IOUtils.writeUTF8(storePath, JSON.stringify(storeData));
+
+  // Reload the ExtensionSettingsStore so it will read the file on disk. Don't
+  // finalize the current store since it will overwrite our file.
+  await ExtensionSettingsStore._reloadFile(false);
+
+  // Verify that the setting is reported as set, but the homepage is still enabled
+  // since there is no matching installed extension.
+  is(
+    ExtensionSettingsStore.getSetting("prefs", "homepage_override").value,
+    "https://developer.mozilla.org",
+    "The homepage_override appears to be set"
+  );
+  await checkHomepageEnabled();
+
+  // Remove the bad store file that we used.
+  await IOUtils.remove(storePath);
+
+  // Reload the ExtensionSettingsStore again so it clears the data we added.
+  // Don't finalize the current store since it will write out the bad data.
+  await ExtensionSettingsStore._reloadFile(false);
+
+  is(
+    ExtensionSettingsStore.getSetting("prefs", "homepage_override"),
+    null,
+    "The ExtensionSettingsStore is left empty."
+  );
+});
+
+add_task(async function testExtensionControlledTrackingProtection() {
+  const TP_PREF = "privacy.trackingprotection.enabled";
+  const TP_DEFAULT = false;
+  const EXTENSION_ID = "@set_tp";
+  const CONTROLLED_LABEL_ID =
+    "contentBlockingTrackingProtectionExtensionContentLabel";
+  const CONTROLLED_BUTTON_ID =
+    "contentBlockingDisableTrackingProtectionExtension";
+
+  let tpEnabledPref = () => Services.prefs.getBoolPref(TP_PREF);
+
+  await SpecialPowers.pushPrefEnv({ set: [[TP_PREF, TP_DEFAULT]] });
+
+  function background() {
+    browser.privacy.websites.trackingProtectionMode.set({ value: "always" });
+  }
+
+  function verifyState(isControlled) {
+    is(tpEnabledPref(), isControlled, "TP pref is set to the expected value.");
+
+    let controlledLabel = doc.getElementById(CONTROLLED_LABEL_ID);
+    let controlledButton = doc.getElementById(CONTROLLED_BUTTON_ID);
+
+    is(
+      controlledLabel.hidden,
+      !isControlled,
+      "The extension controlled row's visibility is as expected."
+    );
+    is(
+      controlledButton.hidden,
+      !isControlled,
+      "The disable extension button's visibility is as expected."
+    );
+    if (isControlled) {
+      let controlledDesc = controlledLabel.querySelector("description");
+      Assert.deepEqual(
+        doc.l10n.getAttributes(controlledDesc),
+        {
+          id: "extension-controlling-websites-content-blocking-all-trackers",
+          args: {
+            name: "set_tp",
+          },
+        },
+        "The user is notified that an extension is controlling TP."
+      );
+    }
+
+    is(
+      doc.getElementById("trackingProtectionMenu").disabled,
+      isControlled,
+      "TP control is enabled."
+    );
+  }
+
+  await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+  let doc = gBrowser.contentDocument;
+
+  is(
+    gBrowser.currentURI.spec,
+    "about:preferences#privacy",
+    "#privacy should be in the URI for about:preferences"
+  );
+
+  verifyState(false);
+
+  // Install an extension that sets Tracking Protection.
+  let extension = ExtensionTestUtils.loadExtension({
+    useAddonManager: "permanent",
+    manifest: {
+      name: "set_tp",
+      browser_specific_settings: { gecko: { id: EXTENSION_ID } },
+      permissions: ["privacy"],
+    },
+    background,
+  });
+
+  let messageShown = waitForMessageShown(CONTROLLED_LABEL_ID);
+  await extension.startup();
+  await messageShown;
+  let addon = await AddonManager.getAddonByID(EXTENSION_ID);
+
+  verifyState(true);
+
+  await disableExtensionViaClick(
+    CONTROLLED_LABEL_ID,
+    CONTROLLED_BUTTON_ID,
+    doc
+  );
+
+  verifyState(false);
+
+  // Enable the extension so we get the UNINSTALL event, which is needed by
+  // ExtensionPreferencesManager to clean up properly.
+  // TODO: BUG 1408226
+  await reEnableExtension(addon, CONTROLLED_LABEL_ID);
+
+  await extension.unload();
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function testExtensionControlledPasswordManager() {
+  const PASSWORD_MANAGER_ENABLED_PREF = "signon.rememberSignons";
+  const PASSWORD_MANAGER_ENABLED_DEFAULT = true;
+  const CONTROLLED_BUTTON_ID = "disablePasswordManagerExtension";
+  const CONTROLLED_LABEL_ID = "passwordManagerExtensionContent";
+  const EXTENSION_ID = "@remember_signons";
+  let manifest = {
+    manifest_version: 2,
+    name: "testPasswordManagerExtension",
+    version: "1.0",
+    description: "Testing rememberSignons",
+    browser_specific_settings: { gecko: { id: EXTENSION_ID } },
+    permissions: ["privacy"],
+    browser_action: {
+      default_title: "Testing rememberSignons",
+    },
+  };
+
+  let passwordManagerEnabledPref = () =>
+    Services.prefs.getBoolPref(PASSWORD_MANAGER_ENABLED_PREF);
+
+  await SpecialPowers.pushPrefEnv({
+    set: [[PASSWORD_MANAGER_ENABLED_PREF, PASSWORD_MANAGER_ENABLED_DEFAULT]],
+  });
+  is(
+    passwordManagerEnabledPref(),
+    true,
+    "Password manager is enabled by default."
+  );
+
+  function verifyState(isControlled) {
+    is(
+      passwordManagerEnabledPref(),
+      !isControlled,
+      "Password manager pref is set to the expected value."
+    );
+    let controlledLabel =
+      gBrowser.contentDocument.getElementById(CONTROLLED_LABEL_ID);
+    let controlledButton =
+      gBrowser.contentDocument.getElementById(CONTROLLED_BUTTON_ID);
+    is(
+      controlledLabel.hidden,
+      !isControlled,
+      "The extension's controlled row visibility is as expected."
+    );
+    is(
+      controlledButton.hidden,
+      !isControlled,
+      "The extension's controlled button visibility is as expected."
+    );
+    if (isControlled) {
+      let controlledDesc = controlledLabel.querySelector("description");
+      Assert.deepEqual(
+        gBrowser.contentDocument.l10n.getAttributes(controlledDesc),
+        {
+          id: "extension-controlling-password-saving",
+          args: {
+            name: "testPasswordManagerExtension",
+          },
+        },
+        "The user is notified that an extension is controlling the remember signons pref."
+      );
+    }
+  }
+
+  await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+
+  info("Verify that no extension is controlling the password manager pref.");
+  verifyState(false);
+
+  let extension = ExtensionTestUtils.loadExtension({
+    manifest,
+    useAddonManager: "permanent",
+    background() {
+      browser.privacy.services.passwordSavingEnabled.set({ value: false });
+    },
+  });
+  let messageShown = waitForMessageShown(CONTROLLED_LABEL_ID);
+  await extension.startup();
+  await messageShown;
+
+  info(
+    "Verify that the test extension is controlling the password manager pref."
+  );
+  verifyState(true);
+
+  info("Verify that the extension shows as controlled when loaded again.");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+  verifyState(true);
+
+  await disableExtensionViaClick(
+    CONTROLLED_LABEL_ID,
+    CONTROLLED_BUTTON_ID,
+    gBrowser.contentDocument
+  );
+
+  info(
+    "Verify that disabling the test extension removes the lock on the password manager pref."
+  );
+  verifyState(false);
+
+  await extension.unload();
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function testExtensionControlledProxyConfig() {
+  const proxySvc = Ci.nsIProtocolProxyService;
+  const PROXY_DEFAULT = proxySvc.PROXYCONFIG_SYSTEM;
+  const EXTENSION_ID = "@set_proxy";
+  const CONTROLLED_SECTION_ID = "proxyExtensionContent";
+  const CONTROLLED_BUTTON_ID = "disableProxyExtension";
+  const CONNECTION_SETTINGS_DESC_ID = "connectionSettingsDescription";
+  const PANEL_URL =
+    "chrome://browser/content/preferences/dialogs/connection.xhtml";
+
+  await SpecialPowers.pushPrefEnv({ set: [[PROXY_PREF, PROXY_DEFAULT]] });
+
+  function background() {
+    browser.proxy.settings.set({ value: { proxyType: "none" } });
+  }
+
+  function expectedConnectionSettingsMessage(doc, isControlled) {
+    return isControlled
+      ? "extension-controlling-proxy-config"
+      : "network-proxy-connection-description";
+  }
+
+  function connectionSettingsMessagePromise(doc, isControlled) {
+    return waitForMessageContent(
+      CONNECTION_SETTINGS_DESC_ID,
+      expectedConnectionSettingsMessage(doc, isControlled),
+      doc
+    );
+  }
+
+  function verifyProxyState(doc, isControlled) {
+    let isPanel = doc.getElementById(CONTROLLED_BUTTON_ID);
+    is(
+      proxyType === proxySvc.PROXYCONFIG_DIRECT,
+      isControlled,
+      "Proxy pref is set to the expected value."
+    );
+
+    if (isPanel) {
+      let controlledSection = doc.getElementById(CONTROLLED_SECTION_ID);
+
+      is(
+        controlledSection.hidden,
+        !isControlled,
+        "The extension controlled row's visibility is as expected."
+      );
+      if (isPanel) {
+        is(
+          doc.getElementById(CONTROLLED_BUTTON_ID).hidden,
+          !isControlled,
+          "The disable extension button's visibility is as expected."
+        );
+      }
+      if (isControlled) {
+        let controlledDesc = controlledSection.querySelector("description");
+        Assert.deepEqual(
+          doc.l10n.getAttributes(controlledDesc),
+          {
+            id: "extension-controlling-proxy-config",
+            args: {
+              name: "set_proxy",
+            },
+          },
+          "The user is notified that an extension is controlling proxy settings."
+        );
+      }
+      function getProxyControls() {
+        let controlGroup = doc.getElementById("networkProxyType");
+        let manualControlContainer = controlGroup.querySelector("#proxy-grid");
+        return {
+          manualControls: [
+            ...manualControlContainer.querySelectorAll(
+              "label[data-l10n-id]:not([control=networkProxyNone])"
+            ),
+            ...manualControlContainer.querySelectorAll("input"),
+            ...manualControlContainer.querySelectorAll("checkbox"),
+            ...doc.querySelectorAll("#networkProxySOCKSVersion > radio"),
+          ],
+          pacControls: [doc.getElementById("networkProxyAutoconfigURL")],
+          otherControls: [
+            doc.querySelector("label[control=networkProxyNone]"),
+            doc.getElementById("networkProxyNone"),
+            ...controlGroup.querySelectorAll(":scope > radio"),
+            ...doc.querySelectorAll("#ConnectionsDialogPane > checkbox"),
+          ],
+        };
+      }
+      let controlState = isControlled ? "disabled" : "enabled";
+      let controls = getProxyControls();
+      for (let element of controls.manualControls) {
+        let disabled =
+          isControlled || proxyType !== proxySvc.PROXYCONFIG_MANUAL;
+        is(
+          element.disabled,
+          disabled,
+          `Manual proxy controls should be ${controlState} - control: ${element.outerHTML}.`
+        );
+      }
+      for (let element of controls.pacControls) {
+        let disabled = isControlled || proxyType !== proxySvc.PROXYCONFIG_PAC;
+        is(
+          element.disabled,
+          disabled,
+          `PAC proxy controls should be ${controlState} - control: ${element.outerHTML}.`
+        );
+      }
+      for (let element of controls.otherControls) {
+        is(
+          element.disabled,
+          isControlled,
+          `Other proxy controls should be ${controlState} - control: ${element.outerHTML}.`
+        );
+      }
+    } else {
+      let elem = doc.getElementById(CONNECTION_SETTINGS_DESC_ID);
+      is(
+        doc.l10n.getAttributes(elem).id,
+        expectedConnectionSettingsMessage(doc, isControlled),
+        "The connection settings description is as expected."
+      );
+    }
+  }
+
+  async function reEnableProxyExtension(addon) {
+    let messageChanged = connectionSettingsMessagePromise(mainDoc, true);
+    await addon.enable();
+    await messageChanged;
+  }
+
+  async function openProxyPanel() {
+    let panel = await openAndLoadSubDialog(PANEL_URL);
+    let closingPromise = BrowserTestUtils.waitForEvent(
+      panel.document.getElementById("ConnectionsDialog"),
+      "dialogclosing"
+    );
+    ok(panel, "Proxy panel opened.");
+    return { panel, closingPromise };
+  }
+
+  async function closeProxyPanel(panelObj) {
+    let dialog = panelObj.panel.document.getElementById("ConnectionsDialog");
+    dialog.cancelDialog();
+    let panelClosingEvent = await panelObj.closingPromise;
+    ok(panelClosingEvent, "Proxy panel closed.");
+  }
+
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  let mainDoc = gBrowser.contentDocument;
+
+  is(
+    gBrowser.currentURI.spec,
+    "about:preferences#general",
+    "#general should be in the URI for about:preferences"
+  );
+
+  verifyProxyState(mainDoc, false);
+
+  // Open the connections panel.
+  let panelObj = await openProxyPanel();
+  let panelDoc = panelObj.panel.document;
+
+  verifyProxyState(panelDoc, false);
+
+  await closeProxyPanel(panelObj);
+
+  verifyProxyState(mainDoc, false);
+
+  // Install an extension that controls proxy settings. The extension needs
+  // incognitoOverride because controlling the proxy.settings requires private
+  // browsing access.
+  let extension = ExtensionTestUtils.loadExtension({
+    incognitoOverride: "spanning",
+    useAddonManager: "permanent",
+    manifest: {
+      name: "set_proxy",
+      browser_specific_settings: { gecko: { id: EXTENSION_ID } },
+      permissions: ["proxy"],
+    },
+    background,
+  });
+
+  let messageChanged = connectionSettingsMessagePromise(mainDoc, true);
+  await extension.startup();
+  await messageChanged;
+  let addon = await AddonManager.getAddonByID(EXTENSION_ID);
+
+  verifyProxyState(mainDoc, true);
+  messageChanged = connectionSettingsMessagePromise(mainDoc, false);
+
+  panelObj = await openProxyPanel();
+  panelDoc = panelObj.panel.document;
+
+  verifyProxyState(panelDoc, true);
+
+  await disableExtensionViaClick(
+    CONTROLLED_SECTION_ID,
+    CONTROLLED_BUTTON_ID,
+    panelDoc
+  );
+
+  verifyProxyState(panelDoc, false);
+
+  await closeProxyPanel(panelObj);
+  await messageChanged;
+
+  verifyProxyState(mainDoc, false);
+
+  await reEnableProxyExtension(addon);
+
+  verifyProxyState(mainDoc, true);
+  messageChanged = connectionSettingsMessagePromise(mainDoc, false);
+
+  panelObj = await openProxyPanel();
+  panelDoc = panelObj.panel.document;
+
+  verifyProxyState(panelDoc, true);
+
+  await disableExtensionViaClick(
+    CONTROLLED_SECTION_ID,
+    CONTROLLED_BUTTON_ID,
+    panelDoc
+  );
+
+  verifyProxyState(panelDoc, false);
+
+  await closeProxyPanel(panelObj);
+  await messageChanged;
+
+  verifyProxyState(mainDoc, false);
+
+  // Enable the extension so we get the UNINSTALL event, which is needed by
+  // ExtensionPreferencesManager to clean up properly.
+  // TODO: BUG 1408226
+  await reEnableProxyExtension(addon);
+
+  await extension.unload();
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+// Test that the newtab menu selection is correct when loading about:preferences
+add_task(async function testMenuSyncFromPrefs() {
+  const DEFAULT_NEWTAB = "about:newtab";
+
+  await openPreferencesViaOpenPreferencesAPI("paneHome", { leaveOpen: true });
+  is(
+    gBrowser.currentURI.spec,
+    "about:preferences#home",
+    "#home should be in the URI for about:preferences"
+  );
+
+  let doc = gBrowser.contentDocument;
+  let newTabMenuList = doc.getElementById("newTabMode");
+  // The new tab page is set to the default.
+  is(AboutNewTab.newTabURL, DEFAULT_NEWTAB, "new tab is set to default");
+
+  is(newTabMenuList.value, "0", "New tab menulist is set to the default");
+
+  newTabMenuList.value = "1";
+  newTabMenuList.dispatchEvent(new Event("command"));
+  is(newTabMenuList.value, "1", "New tab menulist is set to blank");
+
+  gBrowser.reloadTab(gBrowser.selectedTab);
+
+  await TestUtils.waitForCondition(
+    () => gBrowser.contentDocument.getElementById("newTabMode"),
+    "wait until element exists in new contentDoc"
+  );
+
+  is(
+    gBrowser.contentDocument.getElementById("newTabMode").value,
+    "1",
+    "New tab menulist is still set to blank"
+  );
+
+  // Cleanup
+  newTabMenuList.value = "0";
+  newTabMenuList.dispatchEvent(new Event("command"));
+  is(AboutNewTab.newTabURL, DEFAULT_NEWTAB, "new tab is set to default");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_filetype_dialog.js b/browser/components/preferences/tests/browser_filetype_dialog.js
new file mode 100644
index 0000000000..0e5ac036c4
--- /dev/null
+++ b/browser/components/preferences/tests/browser_filetype_dialog.js
@@ -0,0 +1,189 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+SimpleTest.requestCompleteLog();
+const { HandlerServiceTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/HandlerServiceTestUtils.sys.mjs"
+);
+
+let gHandlerService = Cc["@mozilla.org/uriloader/handler-service;1"].getService(
+  Ci.nsIHandlerService
+);
+
+let gOldMailHandlers = [];
+let gDummyHandlers = [];
+let gOriginalPreferredMailHandler;
+let gOriginalPreferredPDFHandler;
+
+registerCleanupFunction(function () {
+  function removeDummyHandlers(handlers) {
+    // Remove any of the dummy handlers we created.
+    for (let i = handlers.Count() - 1; i >= 0; i--) {
+      try {
+        if (
+          gDummyHandlers.some(
+            h =>
+              h.uriTemplate ==
+              handlers.queryElementAt(i, Ci.nsIWebHandlerApp).uriTemplate
+          )
+        ) {
+          handlers.removeElementAt(i);
+        }
+      } catch (ex) {
+        /* ignore non-web-app handlers */
+      }
+    }
+  }
+  // Re-add the original protocol handlers:
+  let mailHandlerInfo = HandlerServiceTestUtils.getHandlerInfo("mailto");
+  let mailHandlers = mailHandlerInfo.possibleApplicationHandlers;
+  for (let h of gOldMailHandlers) {
+    mailHandlers.appendElement(h);
+  }
+  removeDummyHandlers(mailHandlers);
+  mailHandlerInfo.preferredApplicationHandler = gOriginalPreferredMailHandler;
+  gHandlerService.store(mailHandlerInfo);
+
+  let pdfHandlerInfo =
+    HandlerServiceTestUtils.getHandlerInfo("application/pdf");
+  pdfHandlerInfo.preferredAction = Ci.nsIHandlerInfo.handleInternally;
+  pdfHandlerInfo.preferredApplicationHandler = gOriginalPreferredPDFHandler;
+  let handlers = pdfHandlerInfo.possibleApplicationHandlers;
+  for (let i = handlers.Count() - 1; i >= 0; i--) {
+    let app = handlers.queryElementAt(i, Ci.nsIHandlerApp);
+    if (app.name == "Foopydoopydoo") {
+      handlers.removeElementAt(i);
+    }
+  }
+  gHandlerService.store(pdfHandlerInfo);
+
+  gBrowser.removeCurrentTab();
+});
+
+function scrubMailtoHandlers(handlerInfo) {
+  // Remove extant web handlers because they have icons that
+  // we fetch from the web, which isn't allowed in tests.
+  let handlers = handlerInfo.possibleApplicationHandlers;
+  for (let i = handlers.Count() - 1; i >= 0; i--) {
+    try {
+      let handler = handlers.queryElementAt(i, Ci.nsIWebHandlerApp);
+      gOldMailHandlers.push(handler);
+      // If we get here, this is a web handler app. Remove it:
+      handlers.removeElementAt(i);
+    } catch (ex) {}
+  }
+}
+
+("use strict");
+
+add_setup(async function () {
+  // Create our dummy handlers
+  let handler1 = Cc["@mozilla.org/uriloader/web-handler-app;1"].createInstance(
+    Ci.nsIWebHandlerApp
+  );
+  handler1.name = "Handler 1";
+  handler1.uriTemplate = "https://example.com/first/%s";
+
+  let handler2 = Cc["@mozilla.org/uriloader/web-handler-app;1"].createInstance(
+    Ci.nsIWebHandlerApp
+  );
+  handler2.name = "Handler 2";
+  handler2.uriTemplate = "http://example.org/second/%s";
+  gDummyHandlers.push(handler1, handler2);
+
+  function substituteWebHandlers(handlerInfo) {
+    // Append the dummy handlers to replace them:
+    let handlers = handlerInfo.possibleApplicationHandlers;
+    handlers.appendElement(handler1);
+    handlers.appendElement(handler2);
+    gHandlerService.store(handlerInfo);
+  }
+  // Set up our mailto handler test infrastructure.
+  let mailtoHandlerInfo = HandlerServiceTestUtils.getHandlerInfo("mailto");
+  scrubMailtoHandlers(mailtoHandlerInfo);
+  gOriginalPreferredMailHandler = mailtoHandlerInfo.preferredApplicationHandler;
+  substituteWebHandlers(mailtoHandlerInfo);
+
+  // Now add a pdf handler:
+  let pdfHandlerInfo =
+    HandlerServiceTestUtils.getHandlerInfo("application/pdf");
+  // PDF doesn't have built-in web handlers, so no need to scrub.
+  gOriginalPreferredPDFHandler = pdfHandlerInfo.preferredApplicationHandler;
+  let handlers = pdfHandlerInfo.possibleApplicationHandlers;
+  let appHandler = Cc[
+    "@mozilla.org/uriloader/local-handler-app;1"
+  ].createInstance(Ci.nsILocalHandlerApp);
+  appHandler.name = "Foopydoopydoo";
+  appHandler.executable = Services.dirsvc.get("ProfD", Ci.nsIFile);
+  appHandler.executable.append("dummy.exe");
+  // Prefs are picky and want this to exist and be executable (bug 1626009):
+  if (!appHandler.executable.exists()) {
+    appHandler.executable.create(Ci.nsIFile.NORMAL_FILE_TYPE, 0o777);
+  }
+
+  handlers.appendElement(appHandler);
+
+  pdfHandlerInfo.preferredApplicationHandler = appHandler;
+  pdfHandlerInfo.preferredAction = Ci.nsIHandlerInfo.useHelperApp;
+  gHandlerService.store(pdfHandlerInfo);
+
+  await openPreferencesViaOpenPreferencesAPI("general", { leaveOpen: true });
+  info("Preferences page opened on the general pane.");
+
+  await gBrowser.selectedBrowser.contentWindow.promiseLoadHandlersList;
+  info("Apps list loaded.");
+});
+
+add_task(async function dialogShowsCorrectContent() {
+  let win = gBrowser.selectedBrowser.contentWindow;
+
+  let container = win.document.getElementById("handlersView");
+
+  // First, find the PDF item.
+  let pdfItem = container.querySelector("richlistitem[type='application/pdf']");
+  Assert.ok(pdfItem, "pdfItem is present in handlersView.");
+  pdfItem.scrollIntoView({ block: "center" });
+  pdfItem.closest("richlistbox").selectItem(pdfItem);
+
+  // Open its menu
+  let list = pdfItem.querySelector(".actionsMenu");
+  let popup = list.menupopup;
+  let popupShown = BrowserTestUtils.waitForEvent(popup, "popupshown");
+  EventUtils.synthesizeMouseAtCenter(list, {}, win);
+  await popupShown;
+
+  // Then open the dialog
+  const promiseDialogLoaded = promiseLoadSubDialog(
+    "chrome://browser/content/preferences/dialogs/applicationManager.xhtml"
+  );
+  EventUtils.synthesizeMouseAtCenter(
+    popup.querySelector(".manage-app-item"),
+    {},
+    win
+  );
+  let dialogWin = await promiseDialogLoaded;
+
+  // Then verify that the description is correct.
+  let desc = dialogWin.document.getElementById("appDescription");
+  let descL10n = dialogWin.document.l10n.getAttributes(desc);
+  is(descL10n.id, "app-manager-handle-file", "Should have right string");
+  let stringBundle = Services.strings.createBundle(
+    "chrome://mozapps/locale/downloads/unknownContentType.properties"
+  );
+  is(
+    descL10n.args.type,
+    stringBundle.GetStringFromName("pdfExtHandlerDescription"),
+    "Should have PDF string bits."
+  );
+
+  // And that there's one item in the list, with the correct name:
+  let appList = dialogWin.document.getElementById("appList");
+  is(appList.itemCount, 1, "Should have 1 item in the list");
+  is(
+    appList.selectedItem.querySelector("label").getAttribute("value"),
+    "Foopydoopydoo",
+    "Should have the right executable label"
+  );
+
+  dialogWin.close();
+});
diff --git a/browser/components/preferences/tests/browser_fluent.js b/browser/components/preferences/tests/browser_fluent.js
new file mode 100644
index 0000000000..db2daecc4f
--- /dev/null
+++ b/browser/components/preferences/tests/browser_fluent.js
@@ -0,0 +1,40 @@
+function whenMainPaneLoadedFinished() {
+  return new Promise(function (resolve, reject) {
+    const topic = "main-pane-loaded";
+    Services.obs.addObserver(function observer(aSubject) {
+      Services.obs.removeObserver(observer, topic);
+      resolve();
+    }, topic);
+  });
+}
+
+// Temporary test for an experimental new localization API.
+// See bug 1402069 for details.
+add_task(async function () {
+  // The string is used only when `browserTabsRemoteAutostart` is true
+  if (!Services.appinfo.browserTabsRemoteAutostart) {
+    ok(true, "fake test to avoid harness complaining");
+    return;
+  }
+
+  await Promise.all([
+    openPreferencesViaOpenPreferencesAPI("general", { leaveOpen: true }),
+    whenMainPaneLoadedFinished(),
+  ]);
+
+  let doc = gBrowser.contentDocument;
+  await doc.l10n.ready;
+
+  let [msg] = await doc.l10n.formatMessages([{ id: "category-general" }]);
+
+  let elem = doc.querySelector(`#category-general`);
+
+  Assert.deepEqual(msg, {
+    value: null,
+    attributes: [
+      { name: "tooltiptext", value: elem.getAttribute("tooltiptext") },
+    ],
+  });
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_homepage_default.js b/browser/components/preferences/tests/browser_homepage_default.js
new file mode 100644
index 0000000000..e3fcdcec5e
--- /dev/null
+++ b/browser/components/preferences/tests/browser_homepage_default.js
@@ -0,0 +1,31 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function default_homepage_test() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.startup.page", 1]],
+  });
+  let defaults = Services.prefs.getDefaultBranch("");
+  // Simulate a homepage set via policy or a distribution.
+  defaults.setStringPref("browser.startup.homepage", "https://example.com");
+
+  await openPreferencesViaOpenPreferencesAPI("paneHome", { leaveOpen: true });
+
+  let doc = gBrowser.contentDocument;
+  let homeMode = doc.getElementById("homeMode");
+  Assert.equal(homeMode.value, 2, "homeMode should be 2 (Custom URL)");
+
+  let homePageUrl = doc.getElementById("homePageUrl");
+  Assert.equal(
+    homePageUrl.value,
+    "https://example.com",
+    "homePageUrl should be example.com"
+  );
+
+  registerCleanupFunction(async () => {
+    defaults.setStringPref("browser.startup.homepage", "about:home");
+    BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  });
+});
diff --git a/browser/components/preferences/tests/browser_homepages_filter_aboutpreferences.js b/browser/components/preferences/tests/browser_homepages_filter_aboutpreferences.js
new file mode 100644
index 0000000000..f54d0edaaa
--- /dev/null
+++ b/browser/components/preferences/tests/browser_homepages_filter_aboutpreferences.js
@@ -0,0 +1,33 @@
+add_task(async function testSetHomepageUseCurrent() {
+  is(
+    gBrowser.currentURI.spec,
+    "about:blank",
+    "Test starts with about:blank open"
+  );
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, "about:home");
+  await openPreferencesViaOpenPreferencesAPI("paneHome", { leaveOpen: true });
+  let doc = gBrowser.contentDocument;
+  is(
+    gBrowser.currentURI.spec,
+    "about:preferences#home",
+    "#home should be in the URI for about:preferences"
+  );
+  let oldHomepage = HomePage.get();
+
+  let useCurrent = doc.getElementById("useCurrentBtn");
+  useCurrent.click();
+
+  is(gBrowser.tabs.length, 3, "Three tabs should be open");
+  await TestUtils.waitForCondition(
+    () => HomePage.get() == "about:blank|about:home"
+  );
+  is(
+    HomePage.get(),
+    "about:blank|about:home",
+    "about:blank and about:home should be the only homepages set"
+  );
+
+  HomePage.safeSet(oldHomepage);
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_homepages_use_bookmark.js b/browser/components/preferences/tests/browser_homepages_use_bookmark.js
new file mode 100644
index 0000000000..572783481d
--- /dev/null
+++ b/browser/components/preferences/tests/browser_homepages_use_bookmark.js
@@ -0,0 +1,94 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const TEST_URL1 = "http://example.com/1";
+const TEST_URL2 = "http://example.com/2";
+
+add_setup(async function () {
+  let oldHomepagePref = Services.prefs.getCharPref("browser.startup.homepage");
+
+  await openPreferencesViaOpenPreferencesAPI("paneHome", { leaveOpen: true });
+
+  Assert.equal(
+    gBrowser.currentURI.spec,
+    "about:preferences#home",
+    "#home should be in the URI for about:preferences"
+  );
+
+  registerCleanupFunction(async () => {
+    Services.prefs.setCharPref("browser.startup.homepage", oldHomepagePref);
+    BrowserTestUtils.removeTab(gBrowser.selectedTab);
+    await PlacesUtils.bookmarks.eraseEverything();
+  });
+});
+
+add_task(async function testSetHomepageFromBookmark() {
+  let bm = await PlacesUtils.bookmarks.insert({
+    parentGuid: PlacesUtils.bookmarks.menuGuid,
+    title: "TestHomepage",
+    url: TEST_URL1,
+  });
+
+  let doc = gBrowser.contentDocument;
+  // Select the custom URLs option.
+  doc.getElementById("homeMode").value = 2;
+
+  let promiseSubDialogLoaded = promiseLoadSubDialog(
+    "chrome://browser/content/preferences/dialogs/selectBookmark.xhtml"
+  );
+  doc.getElementById("useBookmarkBtn").click();
+
+  let dialog = await promiseSubDialogLoaded;
+  dialog.document.getElementById("bookmarks").selectItems([bm.guid]);
+  dialog.document
+    .getElementById("selectBookmarkDialog")
+    .getButton("accept")
+    .click();
+
+  await TestUtils.waitForCondition(() => HomePage.get() == TEST_URL1);
+
+  Assert.equal(
+    HomePage.get(),
+    TEST_URL1,
+    "Should have set the homepage to the same as the bookmark."
+  );
+});
+
+add_task(async function testSetHomepageFromTopLevelFolder() {
+  // Insert a second item into the menu folder
+  await PlacesUtils.bookmarks.insert({
+    parentGuid: PlacesUtils.bookmarks.menuGuid,
+    title: "TestHomepage",
+    url: TEST_URL2,
+  });
+
+  let doc = gBrowser.contentDocument;
+  // Select the custom URLs option.
+  doc.getElementById("homeMode").value = 2;
+
+  let promiseSubDialogLoaded = promiseLoadSubDialog(
+    "chrome://browser/content/preferences/dialogs/selectBookmark.xhtml"
+  );
+  doc.getElementById("useBookmarkBtn").click();
+
+  let dialog = await promiseSubDialogLoaded;
+  dialog.document
+    .getElementById("bookmarks")
+    .selectItems([PlacesUtils.bookmarks.menuGuid]);
+  dialog.document
+    .getElementById("selectBookmarkDialog")
+    .getButton("accept")
+    .click();
+
+  await TestUtils.waitForCondition(
+    () => HomePage.get() == `${TEST_URL1}|${TEST_URL2}`
+  );
+
+  Assert.equal(
+    HomePage.get(),
+    `${TEST_URL1}|${TEST_URL2}`,
+    "Should have set the homepage to the same as the bookmark."
+  );
+});
diff --git a/browser/components/preferences/tests/browser_hometab_restore_defaults.js b/browser/components/preferences/tests/browser_hometab_restore_defaults.js
new file mode 100644
index 0000000000..55a9a974b2
--- /dev/null
+++ b/browser/components/preferences/tests/browser_hometab_restore_defaults.js
@@ -0,0 +1,220 @@
+add_task(async function testRestoreDefaultsBtn_visible() {
+  const before = SpecialPowers.Services.prefs.getStringPref(
+    "browser.newtabpage.activity-stream.feeds.section.topstories.options",
+    ""
+  );
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      // Hide Pocket prefs so we don't trigger network requests when we reset all preferences
+      [
+        "browser.newtabpage.activity-stream.feeds.section.topstories.options",
+        JSON.stringify(Object.assign({}, JSON.parse(before), { hidden: true })),
+      ],
+      [
+        "browser.newtabpage.activity-stream.discoverystream.endpointSpocsClear",
+        "",
+      ],
+      // Set a user pref to false to force the Restore Defaults button to be visible
+      ["browser.newtabpage.activity-stream.feeds.topsites", false],
+    ],
+  });
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:preferences#home",
+    false
+  );
+  let browser = tab.linkedBrowser;
+
+  await BrowserTestUtils.waitForCondition(
+    () =>
+      SpecialPowers.spawn(
+        browser,
+        [],
+        () =>
+          content.document.getElementById("restoreDefaultHomePageBtn") !== null
+      ),
+    "Wait for the button to be added to the page"
+  );
+
+  await BrowserTestUtils.waitForCondition(
+    () =>
+      SpecialPowers.spawn(
+        browser,
+        [],
+        () =>
+          content.document.querySelector(
+            "[data-subcategory='topsites'] checkbox"
+          ) !== null
+      ),
+    "Wait for the preference checkbox to load"
+  );
+
+  await BrowserTestUtils.waitForCondition(
+    () =>
+      SpecialPowers.spawn(
+        browser,
+        [],
+        () =>
+          content.document.getElementById("restoreDefaultHomePageBtn")
+            .hidden === false
+      ),
+    "Should show the Restore Defaults btn because pref is changed"
+  );
+
+  await SpecialPowers.spawn(browser, [], () =>
+    content.document.getElementById("restoreDefaultHomePageBtn").click()
+  );
+
+  await BrowserTestUtils.waitForCondition(
+    () =>
+      SpecialPowers.spawn(
+        browser,
+        [],
+        () =>
+          content.document.querySelector(
+            "[data-subcategory='topsites'] checkbox"
+          ).checked
+      ),
+    "Should have checked preference"
+  );
+
+  await BrowserTestUtils.waitForCondition(
+    () =>
+      SpecialPowers.spawn(
+        browser,
+        [],
+        () =>
+          content.document.getElementById("restoreDefaultHomePageBtn").style
+            .visibility === "hidden"
+      ),
+    "Should not show the Restore Defaults btn if prefs were reset"
+  );
+
+  const topsitesPref = await SpecialPowers.Services.prefs.getBoolPref(
+    "browser.newtabpage.activity-stream.feeds.topsites"
+  );
+  Assert.ok(topsitesPref, "Topsites pref should have the default value");
+
+  await SpecialPowers.popPrefEnv();
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function testRestoreDefaultsBtn_hidden() {
+  const before = SpecialPowers.Services.prefs.getStringPref(
+    "browser.newtabpage.activity-stream.feeds.section.topstories.options",
+    ""
+  );
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      // Hide Pocket pref so we don't trigger network requests when we reset all preferences
+      [
+        "browser.newtabpage.activity-stream.feeds.section.topstories.options",
+        JSON.stringify(Object.assign({}, JSON.parse(before), { hidden: true })),
+      ],
+      [
+        "browser.newtabpage.activity-stream.discoverystream.endpointSpocsClear",
+        "",
+      ],
+    ],
+  });
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:preferences#home",
+    false
+  );
+  let browser = tab.linkedBrowser;
+
+  await BrowserTestUtils.waitForCondition(
+    () =>
+      SpecialPowers.spawn(
+        browser,
+        [],
+        () =>
+          content.document.getElementById("restoreDefaultHomePageBtn") !== null
+      ),
+    "Wait for the button to be added to the page"
+  );
+
+  await BrowserTestUtils.waitForCondition(
+    () =>
+      SpecialPowers.spawn(
+        browser,
+        [],
+        () =>
+          content.document.querySelector(
+            "[data-subcategory='topsites'] checkbox"
+          ) !== null
+      ),
+    "Wait for the preference checkbox to load"
+  );
+
+  const btnDefault = await SpecialPowers.spawn(
+    browser,
+    [],
+    () =>
+      content.document.getElementById("restoreDefaultHomePageBtn").style
+        .visibility
+  );
+  Assert.equal(
+    btnDefault,
+    "hidden",
+    "When no prefs are changed button should not show up"
+  );
+
+  await BrowserTestUtils.waitForCondition(
+    () =>
+      SpecialPowers.spawn(
+        browser,
+        [],
+        () =>
+          content.document.querySelector(
+            "[data-subcategory='topsites'] checkbox"
+          ).checked
+      ),
+    "Should have checked preference"
+  );
+
+  // Uncheck a pref
+  await SpecialPowers.spawn(browser, [], () =>
+    content.document
+      .querySelector("[data-subcategory='topsites'] checkbox")
+      .click()
+  );
+
+  await BrowserTestUtils.waitForCondition(
+    () =>
+      SpecialPowers.spawn(
+        browser,
+        [],
+        () =>
+          !content.document.querySelector(
+            "[data-subcategory='topsites'] checkbox"
+          ).checked
+      ),
+    "Should have unchecked preference"
+  );
+
+  await BrowserTestUtils.waitForCondition(
+    () =>
+      SpecialPowers.spawn(
+        browser,
+        [],
+        () =>
+          content.document.getElementById("restoreDefaultHomePageBtn").style
+            .visibility === ""
+      ),
+    "Should show the Restore Defaults btn if prefs were changed"
+  );
+
+  // Reset the pref
+  await SpecialPowers.Services.prefs.clearUserPref(
+    "browser.newtabpage.activity-stream.feeds.topsites"
+  );
+
+  await SpecialPowers.popPrefEnv();
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/browser/components/preferences/tests/browser_https_only_exceptions.js b/browser/components/preferences/tests/browser_https_only_exceptions.js
new file mode 100644
index 0000000000..34534ed5f8
--- /dev/null
+++ b/browser/components/preferences/tests/browser_https_only_exceptions.js
@@ -0,0 +1,377 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * First Test
+ * Checks if buttons are disabled/enabled and visible/hidden correctly.
+ */
+add_task(async function testButtons() {
+  // Let's make sure HTTPS-Only and HTTPS-First Mode is off.
+  await setHttpsOnlyPref("off");
+  await setHttpsFirstPref("off");
+
+  // Open the privacy-pane in about:preferences
+  await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+
+  // Get button-element to open the exceptions-dialog
+  const exceptionButton = gBrowser.contentDocument.getElementById(
+    "httpsOnlyExceptionButton"
+  );
+
+  is(
+    exceptionButton.disabled,
+    true,
+    "HTTPS-Only exception button should be disabled when HTTPS-Only Mode is disabled."
+  );
+
+  await setHttpsOnlyPref("private");
+  is(
+    exceptionButton.disabled,
+    false,
+    "HTTPS-Only exception button should be enabled when HTTPS-Only Mode is only enabled in private browsing."
+  );
+
+  await setHttpsOnlyPref("everywhere");
+  is(
+    exceptionButton.disabled,
+    false,
+    "HTTPS-Only exception button should be enabled when HTTPS-Only Mode enabled everywhere."
+  );
+
+  await setHttpsOnlyPref("off");
+  is(
+    exceptionButton.disabled,
+    true,
+    "Turning off HTTPS-Only should disable the exception button again."
+  );
+
+  await setHttpsFirstPref("private");
+  is(
+    exceptionButton.disabled,
+    false,
+    "HTTPS-Only exception button should be enabled when HTTPS-Only Mode is disabled and HTTPS-First Mode is only enabled in private browsing."
+  );
+
+  await setHttpsFirstPref("everywhere");
+  is(
+    exceptionButton.disabled,
+    false,
+    "HTTPS-Only exception button should be enabled when HTTPS-Only Mode is disabled and HTTPS-First Mode enabled everywhere."
+  );
+
+  // Now that the button is clickable, we open the dialog
+  // to check if the correct buttons are visible
+  let promiseSubDialogLoaded = promiseLoadSubDialog(
+    "chrome://browser/content/preferences/dialogs/permissions.xhtml"
+  );
+  exceptionButton.doCommand();
+
+  let win = await promiseSubDialogLoaded;
+
+  const dialogDoc = win.document;
+
+  is(
+    dialogDoc.getElementById("btnBlock").hidden,
+    true,
+    "Block button should not be visible in HTTPS-Only Dialog."
+  );
+  is(
+    dialogDoc.getElementById("btnCookieSession").hidden,
+    true,
+    "Cookie specific allow button should not be visible in HTTPS-Only Dialog."
+  );
+  is(
+    dialogDoc.getElementById("btnAllow").hidden,
+    true,
+    "Allow button should not be visible in HTTPS-Only Dialog."
+  );
+  is(
+    dialogDoc.getElementById("btnHttpsOnlyOff").hidden,
+    false,
+    "HTTPS-Only off button should be visible in HTTPS-Only Dialog."
+  );
+  is(
+    dialogDoc.getElementById("btnHttpsOnlyOffTmp").hidden,
+    false,
+    "HTTPS-Only temporary off button should be visible in HTTPS-Only Dialog."
+  );
+
+  // Reset prefs and close the tab
+  await SpecialPowers.flushPrefEnv();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+/**
+ * Second Test
+ * Checks permissions are added and removed correctly.
+ *
+ * Each test opens a new dialog, performs an action (second argument),
+ * then closes the dialog and checks if the changes were made (third argument).
+ */
+add_task(async function checkDialogFunctionality() {
+  // Enable HTTPS-Only Mode for every window, so the exceptions dialog is accessible.
+  await setHttpsOnlyPref("everywhere");
+
+  // Open the privacy-pane in about:preferences
+  await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+  const preferencesDoc = gBrowser.contentDocument;
+
+  // Test if we can add permanent exceptions
+  await runTest(
+    preferencesDoc,
+    elements => {
+      assertListContents(elements, []);
+
+      elements.url.value = "test.com";
+      elements.btnAllow.doCommand();
+
+      assertListContents(elements, [["http://test.com", elements.allowL10nId]]);
+    },
+    () => [
+      {
+        type: "https-only-load-insecure",
+        origin: "http://test.com",
+        data: "added",
+        capability: Ci.nsIPermissionManager.ALLOW_ACTION,
+        expireType: Ci.nsIPermissionManager.EXPIRE_NEVER,
+      },
+    ]
+  );
+
+  // Test if items are retained, and if temporary exceptions are added correctly
+  await runTest(
+    preferencesDoc,
+    elements => {
+      assertListContents(elements, [["http://test.com", elements.allowL10nId]]);
+
+      elements.url.value = "1.1.1.1:8080";
+      elements.btnAllowSession.doCommand();
+
+      assertListContents(elements, [
+        ["http://test.com", elements.allowL10nId],
+        ["http://1.1.1.1:8080", elements.allowSessionL10nId],
+      ]);
+    },
+    () => [
+      {
+        type: "https-only-load-insecure",
+        origin: "http://1.1.1.1:8080",
+        data: "added",
+        capability: Ci.nsIHttpsOnlyModePermission.LOAD_INSECURE_ALLOW_SESSION,
+        expireType: Ci.nsIPermissionManager.EXPIRE_SESSION,
+      },
+    ]
+  );
+
+  // Test if we can remove the permissions one-by-one
+  await runTest(
+    preferencesDoc,
+    elements => {
+      while (elements.richlistbox.itemCount) {
+        elements.richlistbox.selectedIndex = 0;
+        elements.btnRemove.doCommand();
+      }
+      assertListContents(elements, []);
+    },
+    elements => {
+      let richlistItems = elements.richlistbox.getElementsByAttribute(
+        "origin",
+        "*"
+      );
+      let observances = [];
+      for (let item of richlistItems) {
+        observances.push({
+          type: "https-only-load-insecure",
+          origin: item.getAttribute("origin"),
+          data: "deleted",
+        });
+      }
+      return observances;
+    }
+  );
+
+  // Test if all inputs with an https scheme are added with an http scheme,
+  // while other schemes are kept as they are. (Bug 1757297)
+  await runTest(
+    preferencesDoc,
+    elements => {
+      assertListContents(elements, []);
+
+      elements.url.value = "http://test.com";
+      elements.btnAllow.doCommand();
+
+      assertListContents(elements, [["http://test.com", elements.allowL10nId]]);
+
+      elements.url.value = "https://test.com";
+      elements.btnAllow.doCommand();
+
+      assertListContents(elements, [["http://test.com", elements.allowL10nId]]);
+
+      elements.url.value = "https://test.org";
+      elements.btnAllow.doCommand();
+
+      assertListContents(elements, [
+        ["http://test.com", elements.allowL10nId],
+        ["http://test.org", elements.allowL10nId],
+      ]);
+
+      elements.url.value = "moz-extension://test";
+      elements.btnAllow.doCommand();
+
+      assertListContents(elements, [
+        ["http://test.com", elements.allowL10nId],
+        ["http://test.org", elements.allowL10nId],
+        ["moz-extension://test", elements.allowL10nId],
+      ]);
+    },
+    () => [
+      {
+        type: "https-only-load-insecure",
+        origin: "http://test.com",
+        data: "added",
+        capability: Ci.nsIPermissionManager.ALLOW_ACTION,
+        expireType: Ci.nsIPermissionManager.EXPIRE_NEVER,
+      },
+      {
+        type: "https-only-load-insecure",
+        origin: "http://test.org",
+        data: "added",
+        capability: Ci.nsIPermissionManager.ALLOW_ACTION,
+        expireType: Ci.nsIPermissionManager.EXPIRE_NEVER,
+      },
+      {
+        type: "https-only-load-insecure",
+        origin: "moz-extension://test",
+        data: "added",
+        capability: Ci.nsIPermissionManager.ALLOW_ACTION,
+        expireType: Ci.nsIPermissionManager.EXPIRE_NEVER,
+      },
+    ]
+  );
+
+  // Test if we can remove all permissions at once
+  await runTest(
+    preferencesDoc,
+    elements => {
+      elements.btnRemoveAll.doCommand();
+      assertListContents(elements, []);
+    },
+    elements => {
+      let richlistItems = elements.richlistbox.getElementsByAttribute(
+        "origin",
+        "*"
+      );
+      let observances = [];
+      for (let item of richlistItems) {
+        observances.push({
+          type: "https-only-load-insecure",
+          origin: item.getAttribute("origin"),
+          data: "deleted",
+        });
+      }
+      return observances;
+    }
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+/**
+ * Changes HTTPS-Only Mode pref
+ * @param {string} state "everywhere", "private", "off"
+ */
+async function setHttpsOnlyPref(state) {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["dom.security.https_only_mode", state === "everywhere"],
+      ["dom.security.https_only_mode_pbm", state === "private"],
+    ],
+  });
+}
+
+/**
+ * Changes HTTPS-First Mode pref
+ * @param {string} state "everywhere", "private", "off"
+ */
+async function setHttpsFirstPref(state) {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["dom.security.https_first", state === "everywhere"],
+      ["dom.security.https_first_pbm", state === "private"],
+    ],
+  });
+}
+
+/**
+ * Opens new exceptions dialog, runs test function
+ * @param {HTMLElement} preferencesDoc document of about:preferences tab
+ * @param {function} test function to call when dialog is open
+ * @param {Array} observances permission changes to observe (order is important)
+ */
+async function runTest(preferencesDoc, test, observancesFn) {
+  // Click on exception-button and wait for dialog to open
+  let promiseSubDialogLoaded = promiseLoadSubDialog(
+    "chrome://browser/content/preferences/dialogs/permissions.xhtml"
+  );
+  preferencesDoc.getElementById("httpsOnlyExceptionButton").doCommand();
+
+  let win = await promiseSubDialogLoaded;
+
+  // Create a bunch of references to UI-elements for the test-function
+  const doc = win.document;
+  let elements = {
+    richlistbox: doc.getElementById("permissionsBox"),
+    url: doc.getElementById("url"),
+    btnAllow: doc.getElementById("btnHttpsOnlyOff"),
+    btnAllowSession: doc.getElementById("btnHttpsOnlyOffTmp"),
+    btnRemove: doc.getElementById("removePermission"),
+    btnRemoveAll: doc.getElementById("removeAllPermissions"),
+    allowL10nId: win.gPermissionManager._getCapabilityL10nId(
+      Ci.nsIPermissionManager.ALLOW_ACTION
+    ),
+    allowSessionL10nId: win.gPermissionManager._getCapabilityL10nId(
+      Ci.nsIHttpsOnlyModePermission.LOAD_INSECURE_ALLOW_SESSION
+    ),
+  };
+
+  // Some observances need to be computed based on the current state.
+  const observances = observancesFn(elements);
+
+  // Run test function
+  await test(elements);
+
+  // Click on "Save changes" and wait for permission changes.
+  let btnApplyChanges = doc.querySelector("dialog").getButton("accept");
+  let observeAllPromise = createObserveAllPromise(observances);
+
+  btnApplyChanges.doCommand();
+  await observeAllPromise;
+}
+
+function assertListContents(elements, expected) {
+  is(
+    elements.richlistbox.itemCount,
+    expected.length,
+    "Richlistbox should match the expected amount of exceptions."
+  );
+
+  for (let i = 0; i < expected.length; i++) {
+    let website = expected[i][0];
+    let listItem = elements.richlistbox.getElementsByAttribute(
+      "origin",
+      website
+    );
+    is(listItem.length, 1, "Each origin should be unique");
+    is(
+      listItem[0]
+        .querySelector(".website-capability-value")
+        .getAttribute("data-l10n-id"),
+      expected[i][1],
+      "List item capability should match expected l10n-id"
+    );
+  }
+}
diff --git a/browser/components/preferences/tests/browser_https_only_section.js b/browser/components/preferences/tests/browser_https_only_section.js
new file mode 100644
index 0000000000..a43448adf5
--- /dev/null
+++ b/browser/components/preferences/tests/browser_https_only_section.js
@@ -0,0 +1,74 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Bug 1671122 - Fixed bug where second click on HTTPS-Only Mode enable-checkbox disables it again.
+// https://bugzilla.mozilla.org/bug/1671122
+"use strict";
+
+const HTTPS_ONLY_ENABLED = "enabled";
+const HTTPS_ONLY_PBM_ONLY = "privateOnly";
+const HTTPS_ONLY_DISABLED = "disabled";
+
+add_task(async function httpsOnlyRadioGroupIsWorking() {
+  // Make sure HTTPS-Only mode is only enabled for PBM
+
+  registerCleanupFunction(async function () {
+    Services.prefs.clearUserPref("dom.security.https_only_mode");
+    Services.prefs.clearUserPref("dom.security.https_only_mode_pbm");
+  });
+
+  await SpecialPowers.setBoolPref("dom.security.https_only_mode", false);
+  await SpecialPowers.setBoolPref("dom.security.https_only_mode_pbm", true);
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+
+  const doc = gBrowser.selectedBrowser.contentDocument;
+  const radioGroup = doc.getElementById("httpsOnlyRadioGroup");
+  const enableAllRadio = doc.getElementById("httpsOnlyRadioEnabled");
+  const enablePbmRadio = doc.getElementById("httpsOnlyRadioEnabledPBM");
+  const disableRadio = doc.getElementById("httpsOnlyRadioDisabled");
+
+  // Check if UI
+  check(radioGroup, HTTPS_ONLY_PBM_ONLY);
+
+  // Check if UI updated on pref-change
+  await SpecialPowers.setBoolPref("dom.security.https_only_mode_pbm", false);
+  check(radioGroup, HTTPS_ONLY_DISABLED);
+
+  // Check if prefs change if clicked on radio button
+  enableAllRadio.click();
+  check(radioGroup, HTTPS_ONLY_ENABLED);
+
+  // Check if prefs stay the same if clicked on same
+  // radio button again (see bug 1671122)
+  enableAllRadio.click();
+  check(radioGroup, HTTPS_ONLY_ENABLED);
+
+  // Check if prefs are set correctly for PBM-only mode.
+  enablePbmRadio.click();
+  check(radioGroup, HTTPS_ONLY_PBM_ONLY);
+
+  // Check if prefs are set correctly when disabled again.
+  disableRadio.click();
+  check(radioGroup, HTTPS_ONLY_DISABLED);
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+function check(radioGroupElement, expectedValue) {
+  is(
+    radioGroupElement.value,
+    expectedValue,
+    "Radio Group value should match expected value"
+  );
+  is(
+    SpecialPowers.getBoolPref("dom.security.https_only_mode"),
+    expectedValue === HTTPS_ONLY_ENABLED,
+    "HTTPS-Only pref should match expected value."
+  );
+  is(
+    SpecialPowers.getBoolPref("dom.security.https_only_mode_pbm"),
+    expectedValue === HTTPS_ONLY_PBM_ONLY,
+    "HTTPS-Only PBM pref should match expected value."
+  );
+}
diff --git a/browser/components/preferences/tests/browser_ignore_invalid_capability.js b/browser/components/preferences/tests/browser_ignore_invalid_capability.js
new file mode 100644
index 0000000000..35b2679ffc
--- /dev/null
+++ b/browser/components/preferences/tests/browser_ignore_invalid_capability.js
@@ -0,0 +1,40 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+add_task(async function testInvalidCapabilityIgnored() {
+  info(
+    "Test to make sure that invalid combinations of type and capability are ignored \
+     so the cookieExceptions management popup does not crash"
+  );
+  PermissionTestUtils.add(
+    "https://mozilla.org",
+    "cookie",
+    Ci.nsICookiePermission.ACCESS_ALLOW
+  );
+
+  // This is an invalid combination of type & capability and should be ignored
+  PermissionTestUtils.add(
+    "https://foobar.org",
+    "cookie",
+    Ci.nsIHttpsOnlyModePermission.LOAD_INSECURE_ALLOW_SESSION
+  );
+
+  await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+  let doc = gBrowser.contentDocument;
+  let promiseSubDialogLoaded = promiseLoadSubDialog(
+    "chrome://browser/content/preferences/dialogs/permissions.xhtml"
+  );
+  doc.getElementById("cookieExceptions").doCommand();
+
+  let win = await promiseSubDialogLoaded;
+  doc = win.document;
+
+  is(
+    doc.getElementById("permissionsBox").itemCount,
+    1,
+    "We only display the permission that is valid for the type cookie"
+  );
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_keyboardfocus.js b/browser/components/preferences/tests/browser_keyboardfocus.js
new file mode 100644
index 0000000000..bed452b679
--- /dev/null
+++ b/browser/components/preferences/tests/browser_keyboardfocus.js
@@ -0,0 +1,80 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+async function launchPreferences() {
+  let prefs = await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  Assert.equal(prefs.selectedPane, "paneGeneral", "General pane was selected");
+}
+
+add_task(async function () {
+  await launchPreferences();
+  let checkbox = gBrowser.contentDocument.querySelector(
+    "#useFullKeyboardNavigation"
+  );
+  Assert.ok(
+    !Services.prefs.getIntPref("accessibility.tabfocus", undefined),
+    "no pref value should exist"
+  );
+  Assert.ok(
+    !checkbox.checked,
+    "checkbox should be unchecked before clicking on checkbox"
+  );
+
+  checkbox.click();
+
+  Assert.equal(
+    Services.prefs.getIntPref("accessibility.tabfocus"),
+    7,
+    "Prefstore should reflect checkbox's associated numeric value"
+  );
+  Assert.ok(
+    checkbox.checked,
+    "checkbox should be checked after clicking on checkbox"
+  );
+
+  checkbox.click();
+
+  Assert.ok(
+    !checkbox.checked,
+    "checkbox should be unchecked after clicking on checkbox"
+  );
+  Assert.ok(
+    !Services.prefs.getIntPref("accessibility.tabfocus", undefined),
+    "No pref value should exist"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  SpecialPowers.pushPrefEnv({ set: [["accessibility.tabfocus", 4]] });
+  await launchPreferences();
+  checkbox = gBrowser.contentDocument.querySelector(
+    "#useFullKeyboardNavigation"
+  );
+
+  Assert.ok(
+    !checkbox.checked,
+    "checkbox should stay unchecked after setting non-7 pref value"
+  );
+  Assert.equal(
+    Services.prefs.getIntPref("accessibility.tabfocus", 0),
+    4,
+    "pref should have value in store"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  SpecialPowers.pushPrefEnv({ set: [["accessibility.tabfocus", 7]] });
+  await launchPreferences();
+  checkbox = gBrowser.contentDocument.querySelector(
+    "#useFullKeyboardNavigation"
+  );
+
+  Assert.equal(
+    Services.prefs.getIntPref("accessibility.tabfocus", 0),
+    7,
+    "Pref value should update after modification"
+  );
+  Assert.ok(checkbox.checked, "checkbox should be checked");
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_languages_subdialog.js b/browser/components/preferences/tests/browser_languages_subdialog.js
new file mode 100644
index 0000000000..5be6e5d907
--- /dev/null
+++ b/browser/components/preferences/tests/browser_languages_subdialog.js
@@ -0,0 +1,172 @@
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("general", { leaveOpen: true });
+  const contentDocument = gBrowser.contentDocument;
+  let dialogOverlay = content.gSubDialog._preloadDialog._overlay;
+
+  async function languagesSubdialogOpened() {
+    const promiseSubDialogLoaded = promiseLoadSubDialog(
+      "chrome://browser/content/preferences/dialogs/languages.xhtml"
+    );
+    contentDocument.getElementById("chooseLanguage").click();
+    const win = await promiseSubDialogLoaded;
+    dialogOverlay = content.gSubDialog._topDialog._overlay;
+    ok(!BrowserTestUtils.isHidden(dialogOverlay), "The dialog is visible.");
+    return win;
+  }
+
+  function acceptLanguagesSubdialog(win) {
+    const button = win.document.querySelector("dialog").getButton("accept");
+    button.doCommand();
+  }
+
+  ok(BrowserTestUtils.isHidden(dialogOverlay), "The dialog is invisible.");
+  let win = await languagesSubdialogOpened();
+  ok(
+    win.document.getElementById("spoofEnglish").hidden,
+    "The 'Request English' checkbox is hidden."
+  );
+  acceptLanguagesSubdialog(win);
+  ok(BrowserTestUtils.isHidden(dialogOverlay), "The dialog is invisible.");
+
+  await SpecialPowers.pushPrefEnv({
+    set: [["intl.accept_languages", "en-US,en-XX,foo"]],
+  });
+  win = await languagesSubdialogOpened();
+  let activeLanguages = win.document.getElementById("activeLanguages").children;
+  Assert.equal(
+    activeLanguages[0].id,
+    "en-us",
+    "The ID for 'en-US' locale code is correctly set."
+  );
+  Assert.equal(
+    activeLanguages[0].firstChild.value,
+    "English (United States) [en-us]",
+    "The name for known 'en-US' locale code is correctly resolved."
+  );
+  Assert.equal(
+    activeLanguages[1].id,
+    "en-xx",
+    "The ID for 'en-XX' locale code is correctly set."
+  );
+  Assert.equal(
+    activeLanguages[1].firstChild.value,
+    "English [en-xx]",
+    "The name for unknown 'en-XX' locale code is resolved using 'en'."
+  );
+  Assert.equal(
+    activeLanguages[2].firstChild.value,
+    " [foo]",
+    "The name for unknown 'foo' locale code is empty."
+  );
+  acceptLanguagesSubdialog(win);
+  await SpecialPowers.popPrefEnv();
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["privacy.resistFingerprinting", true],
+      ["privacy.spoof_english", 0],
+    ],
+  });
+
+  win = await languagesSubdialogOpened();
+  ok(
+    !win.document.getElementById("spoofEnglish").hidden,
+    "The 'Request English' checkbox isn't hidden."
+  );
+  ok(
+    !win.document.getElementById("spoofEnglish").checked,
+    "The 'Request English' checkbox isn't checked."
+  );
+  is(
+    win.Preferences.get("privacy.spoof_english").value,
+    0,
+    "The privacy.spoof_english pref is set to 0."
+  );
+
+  win.document.getElementById("spoofEnglish").checked = true;
+  win.document.getElementById("spoofEnglish").doCommand();
+  ok(
+    win.document.getElementById("spoofEnglish").checked,
+    "The 'Request English' checkbox is checked."
+  );
+  is(
+    win.Preferences.get("privacy.spoof_english").value,
+    2,
+    "The privacy.spoof_english pref is set to 2."
+  );
+  acceptLanguagesSubdialog(win);
+
+  win = await languagesSubdialogOpened();
+  ok(
+    !win.document.getElementById("spoofEnglish").hidden,
+    "The 'Request English' checkbox isn't hidden."
+  );
+  ok(
+    win.document.getElementById("spoofEnglish").checked,
+    "The 'Request English' checkbox is checked."
+  );
+  is(
+    win.Preferences.get("privacy.spoof_english").value,
+    2,
+    "The privacy.spoof_english pref is set to 2."
+  );
+
+  win.document.getElementById("spoofEnglish").checked = false;
+  win.document.getElementById("spoofEnglish").doCommand();
+  ok(
+    !win.document.getElementById("spoofEnglish").checked,
+    "The 'Request English' checkbox isn't checked."
+  );
+  is(
+    win.Preferences.get("privacy.spoof_english").value,
+    1,
+    "The privacy.spoof_english pref is set to 1."
+  );
+  acceptLanguagesSubdialog(win);
+
+  win = await languagesSubdialogOpened();
+  ok(
+    !win.document.getElementById("spoofEnglish").hidden,
+    "The 'Request English' checkbox isn't hidden."
+  );
+  ok(
+    !win.document.getElementById("spoofEnglish").checked,
+    "The 'Request English' checkbox isn't checked."
+  );
+  is(
+    win.Preferences.get("privacy.spoof_english").value,
+    1,
+    "The privacy.spoof_english pref is set to 1."
+  );
+  acceptLanguagesSubdialog(win);
+  await SpecialPowers.popPrefEnv();
+
+  await SpecialPowers.pushPrefEnv({
+    set: [["intl.accept_languages", "en-US"]],
+  });
+  win = await languagesSubdialogOpened();
+  is(
+    win.document.getElementById("remove").disabled,
+    false,
+    "The Remove button is enabled when any language is selected on the list"
+  );
+
+  win.document.getElementById("remove").doCommand();
+  is(
+    win.Preferences.get("intl.accept_languages").value,
+    "",
+    "Accepted language has been removed from the preference"
+  );
+  is(
+    win.document.getElementById("activeLanguages").itemCount,
+    0,
+    "Accepted languages list is empty"
+  );
+  ok(
+    win.document.getElementById("remove").disabled,
+    "The Remove button is disabled when there is no language on the list"
+  );
+  acceptLanguagesSubdialog(win);
+
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_layersacceleration.js b/browser/components/preferences/tests/browser_layersacceleration.js
new file mode 100644
index 0000000000..982a32c94d
--- /dev/null
+++ b/browser/components/preferences/tests/browser_layersacceleration.js
@@ -0,0 +1,36 @@
+add_task(async function () {
+  // We must temporarily disable `Once` StaticPrefs check for the duration of
+  // this test (see bug 1556131). We must do so in a separate operation as
+  // pushPrefEnv doesn't set the preferences in the order one could expect.
+  await SpecialPowers.pushPrefEnv({
+    set: [["preferences.force-disable.check.once.policy", true]],
+  });
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["gfx.direct2d.disabled", false],
+      ["layers.acceleration.disabled", false],
+    ],
+  });
+
+  let prefs = await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneGeneral", "General pane was selected");
+
+  let doc = gBrowser.contentDocument;
+  let checkbox = doc.querySelector("#allowHWAccel");
+  is(
+    !checkbox.checked,
+    Services.prefs.getBoolPref("layers.acceleration.disabled"),
+    "checkbox should represent inverted pref value before clicking on checkbox"
+  );
+
+  checkbox.click();
+
+  is(
+    !checkbox.checked,
+    Services.prefs.getBoolPref("layers.acceleration.disabled"),
+    "checkbox should represent inverted pref value after clicking on checkbox"
+  );
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_localSearchShortcuts.js b/browser/components/preferences/tests/browser_localSearchShortcuts.js
new file mode 100644
index 0000000000..0b8e170cc1
--- /dev/null
+++ b/browser/components/preferences/tests/browser_localSearchShortcuts.js
@@ -0,0 +1,309 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Checks the local shortcut rows in the engines list of the search pane.
+ */
+
+"use strict";
+
+ChromeUtils.defineESModuleGetters(this, {
+  UrlbarPrefs: "resource:///modules/UrlbarPrefs.sys.mjs",
+  UrlbarUtils: "resource:///modules/UrlbarUtils.sys.mjs",
+});
+
+let gTree;
+
+add_setup(async function () {
+  let prefs = await openPreferencesViaOpenPreferencesAPI("search", {
+    leaveOpen: true,
+  });
+  registerCleanupFunction(() => {
+    BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  });
+
+  Assert.equal(
+    prefs.selectedPane,
+    "paneSearch",
+    "Sanity check: Search pane is selected by default"
+  );
+
+  gTree = gBrowser.contentDocument.querySelector("#engineList");
+  gTree.scrollIntoView();
+  gTree.focus();
+});
+
+// The rows should be visible and checked by default.
+add_task(async function visible() {
+  await checkRowVisibility(true);
+  await forEachLocalShortcutRow(async (row, shortcut) => {
+    Assert.equal(
+      gTree.view.getCellValue(row, gTree.columns.getNamedColumn("engineShown")),
+      "true",
+      "Row is checked initially"
+    );
+  });
+});
+
+// Toggling the browser.urlbar.shortcuts.* prefs should toggle the corresponding
+// checkboxes in the rows.
+add_task(async function syncFromPrefs() {
+  let col = gTree.columns.getNamedColumn("engineShown");
+  await forEachLocalShortcutRow(async (row, shortcut) => {
+    Assert.equal(
+      gTree.view.getCellValue(row, col),
+      "true",
+      "Row is checked initially"
+    );
+    await SpecialPowers.pushPrefEnv({
+      set: [[getUrlbarPrefName(shortcut.pref), false]],
+    });
+    Assert.equal(
+      gTree.view.getCellValue(row, col),
+      "false",
+      "Row is unchecked after disabling pref"
+    );
+    await SpecialPowers.popPrefEnv();
+    Assert.equal(
+      gTree.view.getCellValue(row, col),
+      "true",
+      "Row is checked after re-enabling pref"
+    );
+  });
+});
+
+// Pressing the space key while a row is selected should toggle its checkbox
+// and pref.
+add_task(async function syncToPrefs_spaceKey() {
+  let col = gTree.columns.getNamedColumn("engineShown");
+  await forEachLocalShortcutRow(async (row, shortcut) => {
+    Assert.ok(
+      UrlbarPrefs.get(shortcut.pref),
+      "Sanity check: Pref is enabled initially"
+    );
+    Assert.equal(
+      gTree.view.getCellValue(row, col),
+      "true",
+      "Row is checked initially"
+    );
+    gTree.view.selection.select(row);
+    EventUtils.synthesizeKey(" ", {}, gTree.ownerGlobal);
+    Assert.ok(
+      !UrlbarPrefs.get(shortcut.pref),
+      "Pref is disabled after pressing space key"
+    );
+    Assert.equal(
+      gTree.view.getCellValue(row, col),
+      "false",
+      "Row is unchecked after pressing space key"
+    );
+    Services.prefs.clearUserPref(getUrlbarPrefName(shortcut.pref));
+  });
+});
+
+// Clicking the checkbox in a local shortcut row should toggle the checkbox and
+// pref.
+add_task(async function syncToPrefs_click() {
+  let col = gTree.columns.getNamedColumn("engineShown");
+  await forEachLocalShortcutRow(async (row, shortcut) => {
+    Assert.ok(
+      UrlbarPrefs.get(shortcut.pref),
+      "Sanity check: Pref is enabled initially"
+    );
+    Assert.equal(
+      gTree.view.getCellValue(row, col),
+      "true",
+      "Row is checked initially"
+    );
+
+    let rect = gTree.getCoordsForCellItem(row, col, "cell");
+    let x = rect.x + rect.width / 2;
+    let y = rect.y + rect.height / 2;
+    EventUtils.synthesizeMouse(gTree.body, x, y, {}, gTree.ownerGlobal);
+
+    Assert.ok(
+      !UrlbarPrefs.get(shortcut.pref),
+      "Pref is disabled after clicking checkbox"
+    );
+    Assert.equal(
+      gTree.view.getCellValue(row, col),
+      "false",
+      "Row is unchecked after clicking checkbox"
+    );
+    Services.prefs.clearUserPref(getUrlbarPrefName(shortcut.pref));
+  });
+});
+
+// The keyword column should not be editable according to isEditable().
+add_task(async function keywordNotEditable_isEditable() {
+  await forEachLocalShortcutRow(async (row, shortcut) => {
+    Assert.ok(
+      !gTree.view.isEditable(
+        row,
+        gTree.columns.getNamedColumn("engineKeyword")
+      ),
+      "Keyword column is not editable"
+    );
+  });
+});
+
+// Pressing the enter key while a row is selected shouldn't allow the keyword to
+// be edited.
+add_task(async function keywordNotEditable_enterKey() {
+  let col = gTree.columns.getNamedColumn("engineKeyword");
+  await forEachLocalShortcutRow(async (row, shortcut) => {
+    Assert.ok(
+      shortcut.restrict,
+      "Sanity check: Shortcut restriction char is non-empty"
+    );
+    Assert.equal(
+      gTree.view.getCellText(row, col),
+      shortcut.restrict,
+      "Sanity check: Keyword column has correct restriction char initially"
+    );
+
+    gTree.view.selection.select(row);
+    EventUtils.synthesizeKey("KEY_Enter", {}, gTree.ownerGlobal);
+    EventUtils.sendString("newkeyword");
+    EventUtils.synthesizeKey("KEY_Enter", {}, gTree.ownerGlobal);
+
+    // Wait a moment to allow for any possible asynchronicity.
+    // eslint-disable-next-line mozilla/no-arbitrary-setTimeout
+    await new Promise(r => setTimeout(r, 500));
+
+    Assert.equal(
+      gTree.view.getCellText(row, col),
+      shortcut.restrict,
+      "Keyword column is still restriction char"
+    );
+  });
+});
+
+// Double-clicking the keyword column shouldn't allow the keyword to be edited.
+add_task(async function keywordNotEditable_click() {
+  let col = gTree.columns.getNamedColumn("engineKeyword");
+  await forEachLocalShortcutRow(async (row, shortcut) => {
+    Assert.ok(
+      shortcut.restrict,
+      "Sanity check: Shortcut restriction char is non-empty"
+    );
+    Assert.equal(
+      gTree.view.getCellText(row, col),
+      shortcut.restrict,
+      "Sanity check: Keyword column has correct restriction char initially"
+    );
+
+    let rect = gTree.getCoordsForCellItem(row, col, "text");
+    let x = rect.x + rect.width / 2;
+    let y = rect.y + rect.height / 2;
+
+    let promise = BrowserTestUtils.waitForEvent(gTree, "dblclick");
+
+    // Click once to select the row.
+    EventUtils.synthesizeMouse(
+      gTree.body,
+      x,
+      y,
+      { clickCount: 1 },
+      gTree.ownerGlobal
+    );
+
+    // Now double-click the keyword column.
+    EventUtils.synthesizeMouse(
+      gTree.body,
+      x,
+      y,
+      { clickCount: 2 },
+      gTree.ownerGlobal
+    );
+
+    await promise;
+
+    EventUtils.sendString("newkeyword");
+    EventUtils.synthesizeKey("KEY_Enter", {}, gTree.ownerGlobal);
+
+    // Wait a moment to allow for any possible asynchronicity.
+    // eslint-disable-next-line mozilla/no-arbitrary-setTimeout
+    await new Promise(r => setTimeout(r, 500));
+
+    Assert.equal(
+      gTree.view.getCellText(row, col),
+      shortcut.restrict,
+      "Keyword column is still restriction char"
+    );
+  });
+});
+
+/**
+ * Asserts that the engine and local shortcut rows are present in the tree.
+ */
+async function checkRowVisibility() {
+  let engines = await Services.search.getVisibleEngines();
+
+  Assert.equal(
+    gTree.view.rowCount,
+    engines.length + UrlbarUtils.LOCAL_SEARCH_MODES.length,
+    "Expected number of tree rows"
+  );
+
+  // Check the engine rows.
+  for (let row = 0; row < engines.length; row++) {
+    let engine = engines[row];
+    let text = gTree.view.getCellText(
+      row,
+      gTree.columns.getNamedColumn("engineName")
+    );
+    Assert.equal(
+      text,
+      engine.name,
+      `Sanity check: Tree row ${row} has expected engine name`
+    );
+  }
+
+  // Check the shortcut rows.
+  await forEachLocalShortcutRow(async (row, shortcut) => {
+    let text = gTree.view.getCellText(
+      row,
+      gTree.columns.getNamedColumn("engineName")
+    );
+    let name = UrlbarUtils.getResultSourceName(shortcut.source);
+    let l10nName = await gTree.ownerDocument.l10n.formatValue(
+      `urlbar-search-mode-${name}`
+    );
+    Assert.ok(l10nName, "Sanity check: l10n name is non-empty");
+    Assert.equal(text, l10nName, `Tree row ${row} has expected shortcut name`);
+  });
+}
+
+/**
+ * Calls a callback for each local shortcut row in the tree.
+ *
+ * @param {function} callback
+ *   Called for each local shortcut row like: callback(rowIndex, shortcutObject)
+ */
+async function forEachLocalShortcutRow(callback) {
+  let engines = await Services.search.getVisibleEngines();
+  for (let i = 0; i < UrlbarUtils.LOCAL_SEARCH_MODES.length; i++) {
+    let shortcut = UrlbarUtils.LOCAL_SEARCH_MODES[i];
+    let row = engines.length + i;
+    // These tests assume LOCAL_SEARCH_MODES are enabled, this can be removed
+    // when we enable QuickActions. We cant just enable the pref in browser.ini
+    // as this test calls clearUserPref.
+    if (shortcut.pref == "shortcuts.quickactions") {
+      continue;
+    }
+    await callback(row, shortcut);
+  }
+}
+
+/**
+ * Prepends the `browser.urlbar.` branch to the given relative pref.
+ *
+ * @param {string} relativePref
+ *   A pref name relative to the `browser.urlbar.`.
+ * @returns {string}
+ *   The full pref name with `browser.urlbar.` prepended.
+ */
+function getUrlbarPrefName(relativePref) {
+  return `browser.urlbar.${relativePref}`;
+}
diff --git a/browser/components/preferences/tests/browser_moreFromMozilla.js b/browser/components/preferences/tests/browser_moreFromMozilla.js
new file mode 100644
index 0000000000..6cb6d9e119
--- /dev/null
+++ b/browser/components/preferences/tests/browser_moreFromMozilla.js
@@ -0,0 +1,395 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { EnterprisePolicyTesting } = ChromeUtils.importESModule(
+  "resource://testing-common/EnterprisePolicyTesting.sys.mjs"
+);
+
+let { TelemetryTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/TelemetryTestUtils.sys.mjs"
+);
+
+const TOTAL_PROMO_CARDS_COUNT = 4;
+
+async function clearPolicies() {
+  // Ensure no active policies are set
+  await EnterprisePolicyTesting.setupPolicyEngineWithJson("");
+}
+
+// The Relay promo is only shown if the default FxA instance is detected, and
+// tests override it to a dummy address, so we need to make the dummy address
+// appear like it's the default (using the actual default instance might cause a
+// remote connection, crashing the test harness).
+add_setup(mockDefaultFxAInstance);
+
+add_task(async function testDefaultUIWithoutTemplatePref() {
+  await clearPolicies();
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  let doc = gBrowser.contentDocument;
+  let tab = gBrowser.selectedTab;
+
+  let moreFromMozillaCategory = doc.getElementById(
+    "category-more-from-mozilla"
+  );
+  ok(moreFromMozillaCategory, "The category exists");
+  ok(!moreFromMozillaCategory.hidden, "The category is not hidden");
+
+  moreFromMozillaCategory.click();
+
+  let productCards = doc.querySelectorAll(".mozilla-product-item.simple");
+  Assert.ok(productCards, "Default UI uses simple template");
+  Assert.equal(
+    productCards.length,
+    TOTAL_PROMO_CARDS_COUNT,
+    "All product cards displayed"
+  );
+
+  const expectedUrl = "https://www.mozilla.org/firefox/browsers/mobile/";
+  let tabOpened = BrowserTestUtils.waitForNewTab(gBrowser, url =>
+    url.startsWith(expectedUrl)
+  );
+  let mobileLink = doc.getElementById("default-fxMobile");
+  mobileLink.click();
+  let openedTab = await tabOpened;
+  Assert.ok(gBrowser.selectedBrowser.documentURI.spec.startsWith(expectedUrl));
+
+  let searchParams = new URL(gBrowser.selectedBrowser.documentURI.spec)
+    .searchParams;
+  Assert.equal(
+    searchParams.get("utm_source"),
+    "about-prefs",
+    "expected utm_source sent"
+  );
+  Assert.equal(
+    searchParams.get("utm_campaign"),
+    "morefrommozilla",
+    "utm_campaign set"
+  );
+  Assert.equal(
+    searchParams.get("utm_medium"),
+    "firefox-desktop",
+    "utm_medium set"
+  );
+  Assert.equal(
+    searchParams.get("utm_content"),
+    "default-global",
+    "default utm_content set"
+  );
+  Assert.ok(
+    !searchParams.has("entrypoint_variation"),
+    "entrypoint_variation should not be set"
+  );
+  Assert.ok(
+    !searchParams.has("entrypoint_experiment"),
+    "entrypoint_experiment should not be set"
+  );
+  BrowserTestUtils.removeTab(openedTab);
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function testDefaulEmailClick() {
+  await clearPolicies();
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  let doc = gBrowser.contentDocument;
+  let tab = gBrowser.selectedTab;
+
+  let moreFromMozillaCategory = doc.getElementById(
+    "category-more-from-mozilla"
+  );
+  moreFromMozillaCategory.click();
+
+  const expectedUrl = "https://www.mozilla.org/firefox/mobile/get-app/?v=mfm";
+  let sendEmailLink = doc.getElementById("default-qr-code-send-email");
+
+  Assert.ok(
+    sendEmailLink.href.startsWith(expectedUrl),
+    `Expected URL ${sendEmailLink.href}`
+  );
+
+  let searchParams = new URL(sendEmailLink.href).searchParams;
+  Assert.equal(searchParams.get("v"), "mfm", "expected send email param set");
+  BrowserTestUtils.removeTab(tab);
+});
+
+/**
+ * Test that we don't show moreFromMozilla pane when it's disabled.
+ */
+add_task(async function testwhenPrefDisabled() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.moreFromMozilla", false]],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  let doc = gBrowser.contentDocument;
+
+  let moreFromMozillaCategory = doc.getElementById(
+    "category-more-from-mozilla"
+  );
+  ok(moreFromMozillaCategory, "The category exists");
+  ok(moreFromMozillaCategory.hidden, "The category is hidden");
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function test_aboutpreferences_event_telemetry() {
+  Services.telemetry.clearEvents();
+  Services.telemetry.setEventRecordingEnabled("aboutpreferences", true);
+
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.moreFromMozilla", true]],
+  });
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+
+  let doc = gBrowser.contentDocument;
+  let moreFromMozillaCategory = doc.getElementById(
+    "category-more-from-mozilla"
+  );
+
+  let clickedPromise = BrowserTestUtils.waitForEvent(
+    moreFromMozillaCategory,
+    "click"
+  );
+  moreFromMozillaCategory.click();
+  await clickedPromise;
+
+  TelemetryTestUtils.assertEvents(
+    [["aboutpreferences", "show", "initial", "paneGeneral"]],
+    { category: "aboutpreferences", method: "show", object: "initial" },
+    { clear: false }
+  );
+  TelemetryTestUtils.assertEvents(
+    [["aboutpreferences", "show", "click", "paneMoreFromMozilla"]],
+    { category: "aboutpreferences", method: "show", object: "click" },
+    { clear: false }
+  );
+  TelemetryTestUtils.assertNumberOfEvents(2);
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function test_aboutpreferences_simple_template() {
+  await clearPolicies();
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.preferences.moreFromMozilla", true],
+      ["browser.preferences.moreFromMozilla.template", "simple"],
+    ],
+  });
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+
+  let doc = gBrowser.contentDocument;
+  let moreFromMozillaCategory = doc.getElementById(
+    "category-more-from-mozilla"
+  );
+
+  moreFromMozillaCategory.click();
+
+  let productCards = doc.querySelectorAll(".mozilla-product-item");
+  Assert.ok(productCards, "The product cards from simple template found");
+  Assert.equal(
+    productCards.length,
+    TOTAL_PROMO_CARDS_COUNT,
+    "All product cards displayed"
+  );
+
+  let qrCodeButtons = doc.querySelectorAll('.qr-code-box[hidden="false"]');
+  Assert.equal(qrCodeButtons.length, 1, "1 qr-code box displayed");
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function test_aboutpreferences_clickBtnVPN() {
+  await clearPolicies();
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.preferences.moreFromMozilla", true],
+      ["browser.preferences.moreFromMozilla.template", "simple"],
+    ],
+  });
+  await openPreferencesViaOpenPreferencesAPI("paneMoreFromMozilla", {
+    leaveOpen: true,
+  });
+
+  let doc = gBrowser.contentDocument;
+  let tab = gBrowser.selectedTab;
+
+  let productCards = doc.querySelectorAll(".mozilla-product-item.simple");
+  Assert.ok(productCards, "Simple template loaded");
+
+  const expectedUrl = "https://www.mozilla.org/products/vpn/";
+  let tabOpened = BrowserTestUtils.waitForNewTab(gBrowser, url =>
+    url.startsWith(expectedUrl)
+  );
+
+  let vpnButton = doc.getElementById("simple-mozillaVPN");
+  vpnButton.click();
+
+  let openedTab = await tabOpened;
+  Assert.ok(gBrowser.selectedBrowser.documentURI.spec.startsWith(expectedUrl));
+
+  let searchParams = new URL(gBrowser.selectedBrowser.documentURI.spec)
+    .searchParams;
+  Assert.equal(
+    searchParams.get("utm_source"),
+    "about-prefs",
+    "expected utm_source sent"
+  );
+  Assert.equal(
+    searchParams.get("utm_campaign"),
+    "morefrommozilla",
+    "utm_campaign set"
+  );
+  Assert.equal(
+    searchParams.get("utm_medium"),
+    "firefox-desktop",
+    "utm_medium set"
+  );
+  Assert.equal(
+    searchParams.get("utm_content"),
+    "fxvt-113-a-global",
+    "utm_content set"
+  );
+  Assert.equal(
+    searchParams.get("entrypoint_experiment"),
+    "morefrommozilla-experiment-1846",
+    "entrypoint_experiment set"
+  );
+  Assert.equal(
+    searchParams.get("entrypoint_variation"),
+    "treatment-simple",
+    "entrypoint_variation set"
+  );
+  BrowserTestUtils.removeTab(openedTab);
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_aboutpreferences_clickBtnMobile() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.preferences.moreFromMozilla", true],
+      ["browser.preferences.moreFromMozilla.template", "simple"],
+    ],
+  });
+  await openPreferencesViaOpenPreferencesAPI("paneMoreFromMozilla", {
+    leaveOpen: true,
+  });
+
+  let doc = gBrowser.contentDocument;
+  let tab = gBrowser.selectedTab;
+
+  let productCards = doc.querySelectorAll("vbox.simple");
+  Assert.ok(productCards, "Simple template loaded");
+
+  const expectedUrl = "https://www.mozilla.org/firefox/browsers/mobile/";
+
+  let mobileUrl = new URL(doc.getElementById("simple-fxMobile").href);
+
+  Assert.ok(mobileUrl.href.startsWith(expectedUrl));
+
+  let searchParams = mobileUrl.searchParams;
+  Assert.equal(
+    searchParams.get("utm_source"),
+    "about-prefs",
+    "expected utm_source sent"
+  );
+  Assert.equal(
+    searchParams.get("utm_campaign"),
+    "morefrommozilla",
+    "utm_campaign set"
+  );
+  Assert.equal(
+    searchParams.get("utm_medium"),
+    "firefox-desktop",
+    "utm_medium set"
+  );
+  Assert.equal(
+    searchParams.get("utm_content"),
+    "fxvt-113-a-global",
+    "default-global",
+    "utm_content set"
+  );
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_aboutpreferences_search() {
+  await clearPolicies();
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.moreFromMozilla", true]],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI(null, {
+    leaveOpen: true,
+  });
+
+  await runSearchInput("Relay");
+
+  let doc = gBrowser.contentDocument;
+  let tab = gBrowser.selectedTab;
+
+  let productCards = doc.querySelectorAll(".mozilla-product-item");
+  Assert.equal(
+    productCards.length,
+    TOTAL_PROMO_CARDS_COUNT,
+    "All products in the group are found"
+  );
+  let [mobile, monitor, vpn, relay] = productCards;
+  Assert.ok(BrowserTestUtils.isHidden(mobile), "Mobile hidden");
+  Assert.ok(BrowserTestUtils.isHidden(monitor), "Monitor hidden");
+  Assert.ok(BrowserTestUtils.isHidden(vpn), "VPN hidden");
+  Assert.ok(BrowserTestUtils.isVisible(relay), "Relay shown");
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_aboutpreferences_clickBtnRelay() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.moreFromMozilla", true]],
+  });
+  await openPreferencesViaOpenPreferencesAPI("paneMoreFromMozilla", {
+    leaveOpen: true,
+  });
+
+  let doc = gBrowser.contentDocument;
+  let tab = gBrowser.selectedTab;
+
+  let expectedUrl = new URL("https://relay.firefox.com");
+  expectedUrl.searchParams.set("utm_source", "about-prefs");
+  expectedUrl.searchParams.set("utm_campaign", "morefrommozilla");
+  expectedUrl.searchParams.set("utm_medium", "firefox-desktop");
+  expectedUrl.searchParams.set("utm_content", "fxvt-113-a-global");
+  expectedUrl.searchParams.set(
+    "entrypoint_experiment",
+    "morefrommozilla-experiment-1846"
+  );
+  expectedUrl.searchParams.set("entrypoint_variation", "treatment-simple");
+
+  let tabOpened = BrowserTestUtils.waitForDocLoadAndStopIt(
+    expectedUrl.toString(),
+    gBrowser,
+    channel => {
+      Assert.equal(
+        channel.originalURI.spec,
+        expectedUrl.toString(),
+        "URL matched"
+      );
+      return true;
+    }
+  );
+  doc.getElementById("simple-firefoxRelay").click();
+
+  await tabOpened;
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/browser/components/preferences/tests/browser_moreFromMozilla_locales.js b/browser/components/preferences/tests/browser_moreFromMozilla_locales.js
new file mode 100644
index 0000000000..348fd155a0
--- /dev/null
+++ b/browser/components/preferences/tests/browser_moreFromMozilla_locales.js
@@ -0,0 +1,371 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { EnterprisePolicyTesting } = ChromeUtils.importESModule(
+  "resource://testing-common/EnterprisePolicyTesting.sys.mjs"
+);
+
+let { Region } = ChromeUtils.importESModule(
+  "resource://gre/modules/Region.sys.mjs"
+);
+
+const initialHomeRegion = Region._home;
+const initialCurrentRegion = Region._current;
+
+// Helper to run tests for specific regions
+async function setupRegions(home, current) {
+  Region._setHomeRegion(home || "");
+  Region._setCurrentRegion(current || "");
+}
+
+function setLocale(language) {
+  Services.locale.availableLocales = [language];
+  Services.locale.requestedLocales = [language];
+}
+
+async function clearPolicies() {
+  // Ensure no active policies are set
+  await EnterprisePolicyTesting.setupPolicyEngineWithJson("");
+}
+
+async function getPromoCards() {
+  await openPreferencesViaOpenPreferencesAPI("paneMoreFromMozilla", {
+    leaveOpen: true,
+  });
+
+  let doc = gBrowser.contentDocument;
+  let vpnPromoCard = doc.getElementById("mozilla-vpn");
+  let monitorPromoCard = doc.getElementById("mozilla-monitor");
+  let mobileCard = doc.getElementById("firefox-mobile");
+  let relayPromoCard = doc.getElementById("firefox-relay");
+
+  return {
+    vpnPromoCard,
+    monitorPromoCard,
+    mobileCard,
+    relayPromoCard,
+  };
+}
+
+let mockFxA, unmockFxA;
+
+// The Relay promo is only shown if the default FxA instance is detected, and
+// tests override it to a dummy address, so we need to make the dummy address
+// appear like it's the default (using the actual default instance might cause a
+// remote connection, crashing the test harness).
+add_setup(async function () {
+  let { mock, unmock } = await mockDefaultFxAInstance();
+  mockFxA = mock;
+  unmockFxA = unmock;
+});
+
+add_task(async function test_VPN_promo_enabled() {
+  await clearPolicies();
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.preferences.moreFromMozilla", true],
+      ["browser.vpn_promo.enabled", true],
+    ],
+  });
+
+  let { vpnPromoCard, mobileCard } = await getPromoCards();
+
+  ok(vpnPromoCard, "The VPN promo is visible");
+  ok(mobileCard, "The Mobile promo is visible");
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function test_VPN_promo_disabled() {
+  await clearPolicies();
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.vpn_promo.enabled", false]],
+  });
+
+  let { vpnPromoCard, mobileCard } = await getPromoCards();
+
+  ok(!vpnPromoCard, "The VPN promo is not visible");
+  ok(mobileCard, "The Mobile promo is visible");
+
+  Services.prefs.clearUserPref("browser.vpn_promo.enabled");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function test_VPN_promo_in_disallowed_home_region() {
+  await clearPolicies();
+  const disallowedRegion = "SY";
+
+  setupRegions(disallowedRegion);
+
+  // Promo should not show in disallowed regions even when vpn_promo pref is enabled
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.vpn_promo.enabled", true]],
+  });
+
+  let { vpnPromoCard, mobileCard } = await getPromoCards();
+
+  ok(!vpnPromoCard, "The VPN promo is not visible");
+  ok(mobileCard, "The Mobile promo is visible");
+
+  setupRegions(initialHomeRegion, initialCurrentRegion); // revert changes to regions
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function test_VPN_promo_in_illegal_home_region() {
+  await clearPolicies();
+  const illegalRegion = "CN";
+
+  setupRegions(illegalRegion);
+
+  // Promo should not show in illegal regions even if the list of disallowed regions is somehow altered (though changing this preference is blocked)
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.vpn_promo.disallowedRegions", "SY, CU"]],
+  });
+
+  let { vpnPromoCard, mobileCard } = await getPromoCards();
+
+  ok(!vpnPromoCard, "The VPN promo is not visible");
+  ok(mobileCard, "The Mobile promo is visible");
+
+  setupRegions(initialHomeRegion, initialCurrentRegion); // revert changes to regions
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function test_VPN_promo_in_disallowed_current_region() {
+  await clearPolicies();
+  const allowedRegion = "US";
+  const disallowedRegion = "SY";
+
+  setupRegions(allowedRegion, disallowedRegion);
+
+  // Promo should not show in disallowed regions even when vpn_promo pref is enabled
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.vpn_promo.enabled", true]],
+  });
+
+  let { vpnPromoCard, mobileCard } = await getPromoCards();
+
+  ok(!vpnPromoCard, "The VPN promo is not visible");
+  ok(mobileCard, "The Mobile promo is visible");
+
+  setupRegions(initialHomeRegion, initialCurrentRegion); // revert changes to regions
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function test_VPN_promo_in_illegal_current_region() {
+  await clearPolicies();
+  const allowedRegion = "US";
+  const illegalRegion = "CN";
+
+  setupRegions(allowedRegion, illegalRegion);
+
+  // Promo should not show in illegal regions even if the list of disallowed regions is somehow altered (though changing this preference is blocked)
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.vpn_promo.disallowedRegions", "SY, CU"]],
+  });
+
+  let { vpnPromoCard, mobileCard } = await getPromoCards();
+
+  ok(!vpnPromoCard, "The VPN promo is not visible");
+  ok(mobileCard, "The Mobile promo is visible");
+
+  setupRegions(initialHomeRegion, initialCurrentRegion); // revert changes to regions
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function test_aboutpreferences_partnerCNRepack() {
+  let defaultBranch = Services.prefs.getDefaultBranch(null);
+  defaultBranch.setCharPref("distribution.id", "MozillaOnline");
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.preferences.moreFromMozilla", true],
+      ["browser.preferences.moreFromMozilla.template", "simple"],
+    ],
+  });
+  await openPreferencesViaOpenPreferencesAPI("paneMoreFromMozilla", {
+    leaveOpen: true,
+  });
+
+  let doc = gBrowser.contentDocument;
+  let tab = gBrowser.selectedTab;
+
+  let productCards = doc.querySelectorAll("vbox.simple");
+  Assert.ok(productCards, "Simple template loaded");
+
+  const expectedUrl = "https://www.firefox.com.cn/browsers/mobile/";
+
+  let link = doc.getElementById("simple-fxMobile");
+  Assert.ok(link.getAttribute("href").startsWith(expectedUrl));
+
+  defaultBranch.setCharPref("distribution.id", "");
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_send_to_device_email_link_for_supported_locale() {
+  // Email is supported for Brazilian Portuguese
+  const supportedLocale = "pt-BR";
+  const initialLocale = Services.locale.appLocaleAsBCP47;
+  setLocale(supportedLocale);
+
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.moreFromMozilla.template", "simple"]],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("paneMoreFromMozilla", {
+    leaveOpen: true,
+  });
+
+  let doc = gBrowser.contentDocument;
+  let emailLink = doc.getElementById("simple-qr-code-send-email");
+
+  ok(!BrowserTestUtils.isHidden(emailLink), "Email link should be visible");
+
+  await SpecialPowers.popPrefEnv();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  setLocale(initialLocale); // revert changes to language
+});
+
+add_task(
+  async function test_send_to_device_email_link_for_unsupported_locale() {
+    // Email is not supported for Afrikaans
+    const unsupportedLocale = "af";
+    const initialLocale = Services.locale.appLocaleAsBCP47;
+    setLocale(unsupportedLocale);
+
+    await SpecialPowers.pushPrefEnv({
+      set: [["browser.preferences.moreFromMozilla.template", "simple"]],
+    });
+
+    await openPreferencesViaOpenPreferencesAPI("paneMoreFromMozilla", {
+      leaveOpen: true,
+    });
+
+    let doc = gBrowser.contentDocument;
+    let emailLink = doc.getElementById("simple-qr-code-send-email");
+
+    ok(BrowserTestUtils.isHidden(emailLink), "Email link should be hidden");
+
+    await SpecialPowers.popPrefEnv();
+    BrowserTestUtils.removeTab(gBrowser.selectedTab);
+    setLocale(initialLocale); // revert changes to language
+  }
+);
+
+add_task(
+  async function test_VPN_promo_in_unsupported_current_region_with_supported_home_region() {
+    await clearPolicies();
+    const supportedRegion = "US";
+    const unsupportedRegion = "LY";
+
+    setupRegions(supportedRegion, unsupportedRegion);
+
+    let { vpnPromoCard, mobileCard } = await getPromoCards();
+
+    ok(vpnPromoCard, "The VPN promo is visible");
+    ok(mobileCard, "The Mobile promo is visible");
+
+    setupRegions(initialHomeRegion, initialCurrentRegion); // revert changes to regions
+    BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  }
+);
+
+add_task(
+  async function test_VPN_promo_in_supported_current_region_with_unsupported_home_region() {
+    await clearPolicies();
+    const supportedRegion = "US";
+    const unsupportedRegion = "LY";
+
+    setupRegions(unsupportedRegion, supportedRegion);
+
+    let { vpnPromoCard, mobileCard } = await getPromoCards();
+
+    ok(vpnPromoCard, "The VPN promo is visible");
+    ok(mobileCard, "The Mobile promo is visible");
+
+    setupRegions(initialHomeRegion, initialCurrentRegion); // revert changes to regions
+    BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  }
+);
+
+add_task(async function test_VPN_promo_with_active_enterprise_policy() {
+  // set up an arbitrary enterprise policy
+  await EnterprisePolicyTesting.setupPolicyEngineWithJson({
+    policies: {
+      EnableTrackingProtection: {
+        Value: true,
+      },
+    },
+  });
+
+  let { vpnPromoCard, mobileCard } = await getPromoCards();
+  ok(!vpnPromoCard, "The VPN promo is not visible");
+  ok(mobileCard, "The Mobile promo is visible");
+
+  setupRegions(initialHomeRegion, initialCurrentRegion); // revert changes to regions
+  await clearPolicies();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function test_relay_promo_with_supported_fxa_server() {
+  await clearPolicies();
+
+  let { relayPromoCard } = await getPromoCards();
+  ok(relayPromoCard, "The Relay promo is visible");
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function test_relay_promo_with_unsupported_fxa_server() {
+  await clearPolicies();
+  // Set the default pref value to something other than the current value so it
+  // will appear to be user-set and treated as invalid (actually setting the
+  // pref would cause a remote connection and crash the test harness)
+  unmockFxA();
+
+  let { relayPromoCard } = await getPromoCards();
+  ok(!relayPromoCard, "The Relay promo is not visible");
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  mockFxA();
+});
+
+add_task(async function test_Monitor_US_region_desc() {
+  const supportedRegion = "US";
+  setupRegions(supportedRegion);
+
+  let { monitorPromoCard } = await getPromoCards();
+  ok(monitorPromoCard, "The Monitor promo is visible");
+
+  let monitorDescElement =
+    monitorPromoCard.nextElementSibling.querySelector(".description");
+  is(
+    monitorDescElement.getAttribute("data-l10n-id"),
+    "more-from-moz-mozilla-monitor-us-description",
+    "US Region desc set"
+  );
+
+  setupRegions(initialHomeRegion, initialCurrentRegion); // revert changes to regions
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function test_Monitor_global_region_desc() {
+  const supportedRegion = "UK";
+  setupRegions(supportedRegion);
+
+  let { monitorPromoCard } = await getPromoCards();
+  ok(monitorPromoCard, "The Monitor promo is visible");
+
+  let monitorDescElement =
+    monitorPromoCard.nextElementSibling.querySelector(".description");
+  is(
+    monitorDescElement.getAttribute("data-l10n-id"),
+    "more-from-moz-mozilla-monitor-global-description",
+    "Global Region desc set"
+  );
+
+  setupRegions(initialHomeRegion, initialCurrentRegion); // revert changes to regions
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_newtab_menu.js b/browser/components/preferences/tests/browser_newtab_menu.js
new file mode 100644
index 0000000000..774c9dd756
--- /dev/null
+++ b/browser/components/preferences/tests/browser_newtab_menu.js
@@ -0,0 +1,38 @@
+add_task(async function newtabPreloaded() {
+  await openPreferencesViaOpenPreferencesAPI("paneHome", { leaveOpen: true });
+
+  const { contentDocument: doc, contentWindow } = gBrowser;
+  function dispatchMenuItemCommand(menuItem) {
+    const cmdEvent = doc.createEvent("xulcommandevent");
+    cmdEvent.initCommandEvent(
+      "command",
+      true,
+      true,
+      contentWindow,
+      0,
+      false,
+      false,
+      false,
+      false,
+      0,
+      null,
+      0
+    );
+    menuItem.dispatchEvent(cmdEvent);
+  }
+
+  const menuHome = doc.querySelector(`#newTabMode menuitem[value="0"]`);
+  const menuBlank = doc.querySelector(`#newTabMode menuitem[value="1"]`);
+  ok(menuHome.selected, "The first item, Home (default), is selected.");
+  ok(NewTabPagePreloading.enabled, "Default Home allows preloading.");
+
+  dispatchMenuItemCommand(menuBlank);
+  ok(menuBlank.selected, "The second item, Blank, is selected.");
+  ok(!NewTabPagePreloading.enabled, "Non-Home prevents preloading.");
+
+  dispatchMenuItemCommand(menuHome);
+  ok(menuHome.selected, "The first item, Home, is selected again.");
+  ok(NewTabPagePreloading.enabled, "Default Home allows preloading again.");
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_notifications_do_not_disturb.js b/browser/components/preferences/tests/browser_notifications_do_not_disturb.js
new file mode 100644
index 0000000000..afc31b9041
--- /dev/null
+++ b/browser/components/preferences/tests/browser_notifications_do_not_disturb.js
@@ -0,0 +1,57 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+registerCleanupFunction(function () {
+  while (gBrowser.tabs[1]) {
+    gBrowser.removeTab(gBrowser.tabs[1]);
+  }
+});
+
+add_task(async function () {
+  let prefs = await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "panePrivacy", "Privacy pane was selected");
+
+  let doc = gBrowser.contentDocument;
+  let notificationsDoNotDisturbBox = doc.getElementById(
+    "notificationsDoNotDisturbBox"
+  );
+  if (notificationsDoNotDisturbBox.hidden) {
+    todo(false, "Do not disturb is not available on this platform");
+    return;
+  }
+
+  let alertService;
+  try {
+    alertService = Cc["@mozilla.org/alerts-service;1"]
+      .getService(Ci.nsIAlertsService)
+      .QueryInterface(Ci.nsIAlertsDoNotDisturb);
+  } catch (ex) {
+    ok(true, "Do not disturb is not available on this platform: " + ex.message);
+    return;
+  }
+
+  let checkbox = doc.getElementById("notificationsDoNotDisturb");
+  ok(!checkbox.checked, "Checkbox should not be checked by default");
+  ok(
+    !alertService.manualDoNotDisturb,
+    "Do not disturb should be off by default"
+  );
+
+  let checkboxChanged = BrowserTestUtils.waitForEvent(checkbox, "command");
+  checkbox.click();
+  await checkboxChanged;
+  ok(
+    alertService.manualDoNotDisturb,
+    "Do not disturb should be enabled when checked"
+  );
+
+  checkboxChanged = BrowserTestUtils.waitForEvent(checkbox, "command");
+  checkbox.click();
+  await checkboxChanged;
+  ok(
+    !alertService.manualDoNotDisturb,
+    "Do not disturb should be disabled when unchecked"
+  );
+});
diff --git a/browser/components/preferences/tests/browser_open_download_preferences.js b/browser/components/preferences/tests/browser_open_download_preferences.js
new file mode 100644
index 0000000000..794d2ebb05
--- /dev/null
+++ b/browser/components/preferences/tests/browser_open_download_preferences.js
@@ -0,0 +1,288 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { HandlerServiceTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/HandlerServiceTestUtils.sys.mjs"
+);
+
+const TEST_PATH = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "https://example.com"
+);
+
+async function selectPdfCategoryItem() {
+  await openPreferencesViaOpenPreferencesAPI("general", { leaveOpen: true });
+  info("Preferences page opened on the general pane.");
+
+  await gBrowser.selectedBrowser.contentWindow.promiseLoadHandlersList;
+  info("Apps list loaded.");
+
+  let win = gBrowser.selectedBrowser.contentWindow;
+  let container = win.document.getElementById("handlersView");
+  let pdfCategory = container.querySelector(
+    "richlistitem[type='application/pdf']"
+  );
+
+  pdfCategory.closest("richlistbox").selectItem(pdfCategory);
+  Assert.ok(pdfCategory.selected, "Should be able to select our item.");
+
+  return pdfCategory;
+}
+
+async function selectItemInPopup(item, list) {
+  let popup = list.menupopup;
+  let popupShown = BrowserTestUtils.waitForEvent(popup, "popupshown");
+  // Synthesizing the mouse on the .actionsMenu menulist somehow just selects
+  // the top row. Probably something to do with the multiple layers of anon
+  // content - workaround by using the `.open` setter instead.
+  list.open = true;
+  await popupShown;
+  let popupHidden = BrowserTestUtils.waitForEvent(popup, "popuphidden");
+
+  item.click();
+  popup.hidePopup();
+  await popupHidden;
+  return item;
+}
+
+function downloadHadFinished(publicList) {
+  return new Promise(resolve => {
+    publicList.addView({
+      onDownloadChanged(download) {
+        if (download.succeeded || download.error) {
+          publicList.removeView(this);
+          resolve(download);
+        }
+      },
+    });
+  });
+}
+
+async function removeTheFile(download) {
+  Assert.ok(
+    await IOUtils.exists(download.target.path),
+    "The file should have been downloaded."
+  );
+
+  try {
+    info("removing " + download.target.path);
+    if (Services.appinfo.OS === "WINNT") {
+      // We need to make the file writable to delete it on Windows.
+      await IOUtils.setPermissions(download.target.path, 0o600);
+    }
+    await IOUtils.remove(download.target.path);
+  } catch (ex) {
+    info("The file " + download.target.path + " is not removed, " + ex);
+  }
+}
+
+add_task(async function alwaysAskPreferenceWorks() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.download.always_ask_before_handling_new_types", false],
+      ["browser.download.useDownloadDir", true],
+    ],
+  });
+
+  let pdfCategory = await selectPdfCategoryItem();
+  let list = pdfCategory.querySelector(".actionsMenu");
+
+  let alwaysAskItem = list.querySelector(
+    `menuitem[action='${Ci.nsIHandlerInfo.alwaysAsk}']`
+  );
+
+  await selectItemInPopup(alwaysAskItem, list);
+  Assert.equal(
+    list.selectedItem,
+    alwaysAskItem,
+    "Should have selected 'always ask' for pdf"
+  );
+  let alwaysAskBeforeHandling = HandlerServiceTestUtils.getHandlerInfo(
+    pdfCategory.getAttribute("type")
+  ).alwaysAskBeforeHandling;
+  Assert.ok(
+    alwaysAskBeforeHandling,
+    "Should have turned on 'always asking before handling'"
+  );
+
+  let domWindowPromise = BrowserTestUtils.domWindowOpenedAndLoaded();
+  let loadingTab = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser,
+    opening: TEST_PATH + "empty_pdf_file.pdf",
+    waitForLoad: false,
+    waitForStateStop: true,
+  });
+
+  let domWindow = await domWindowPromise;
+  let dialog = domWindow.document.querySelector("#unknownContentType");
+  let button = dialog.getButton("cancel");
+
+  await TestUtils.waitForCondition(
+    () => !button.disabled,
+    "Wait for Cancel button to get enabled"
+  );
+  Assert.ok(dialog, "Dialog should be shown");
+  dialog.cancelDialog();
+  BrowserTestUtils.removeTab(loadingTab);
+
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function handleInternallyPreferenceWorks() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.download.always_ask_before_handling_new_types", false],
+      ["browser.download.useDownloadDir", true],
+    ],
+  });
+
+  let pdfCategory = await selectPdfCategoryItem();
+  let list = pdfCategory.querySelector(".actionsMenu");
+
+  let handleInternallyItem = list.querySelector(
+    `menuitem[action='${Ci.nsIHandlerInfo.handleInternally}']`
+  );
+
+  await selectItemInPopup(handleInternallyItem, list);
+  Assert.equal(
+    list.selectedItem,
+    handleInternallyItem,
+    "Should have selected 'handle internally' for pdf"
+  );
+
+  let loadingTab = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser,
+    opening: TEST_PATH + "empty_pdf_file.pdf",
+    waitForLoad: false,
+    waitForStateStop: true,
+  });
+
+  await ContentTask.spawn(loadingTab.linkedBrowser, null, async () => {
+    await ContentTaskUtils.waitForCondition(
+      () => content.document.readyState == "complete"
+    );
+    Assert.ok(
+      content.document.querySelector("div#viewer"),
+      "document content has viewer UI"
+    );
+  });
+
+  BrowserTestUtils.removeTab(loadingTab);
+
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function saveToDiskPreferenceWorks() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.download.always_ask_before_handling_new_types", false],
+      ["browser.download.useDownloadDir", true],
+    ],
+  });
+
+  let pdfCategory = await selectPdfCategoryItem();
+  let list = pdfCategory.querySelector(".actionsMenu");
+
+  let saveToDiskItem = list.querySelector(
+    `menuitem[action='${Ci.nsIHandlerInfo.saveToDisk}']`
+  );
+
+  await selectItemInPopup(saveToDiskItem, list);
+  Assert.equal(
+    list.selectedItem,
+    saveToDiskItem,
+    "Should have selected 'save to disk' for pdf"
+  );
+
+  let publicList = await Downloads.getList(Downloads.PUBLIC);
+  registerCleanupFunction(async () => {
+    await publicList.removeFinished();
+  });
+
+  let downloadFinishedPromise = downloadHadFinished(publicList);
+
+  let loadingTab = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser,
+    opening: TEST_PATH + "empty_pdf_file.pdf",
+    waitForLoad: false,
+    waitForStateStop: true,
+  });
+
+  let download = await downloadFinishedPromise;
+  BrowserTestUtils.removeTab(loadingTab);
+
+  await removeTheFile(download);
+
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function useSystemDefaultPreferenceWorks() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.download.always_ask_before_handling_new_types", false],
+      ["browser.download.useDownloadDir", true],
+    ],
+  });
+
+  let pdfCategory = await selectPdfCategoryItem();
+  let list = pdfCategory.querySelector(".actionsMenu");
+
+  let useSystemDefaultItem = list.querySelector(
+    `menuitem[action='${Ci.nsIHandlerInfo.useSystemDefault}']`
+  );
+
+  // Whether there's a "use default" item depends on the OS, there might not be a system default viewer.
+  if (!useSystemDefaultItem) {
+    info(
+      "No 'Use default' item, so no testing for setting 'use system default' preference"
+    );
+    gBrowser.removeCurrentTab();
+    return;
+  }
+
+  await selectItemInPopup(useSystemDefaultItem, list);
+  Assert.equal(
+    list.selectedItem,
+    useSystemDefaultItem,
+    "Should have selected 'use system default' for pdf"
+  );
+
+  let oldLaunchFile = DownloadIntegration.launchFile;
+
+  let waitForLaunchFileCalled = new Promise(resolve => {
+    DownloadIntegration.launchFile = () => {
+      ok(true, "The file should be launched with an external application");
+      resolve();
+    };
+  });
+
+  let publicList = await Downloads.getList(Downloads.PUBLIC);
+  registerCleanupFunction(async () => {
+    await publicList.removeFinished();
+  });
+
+  let downloadFinishedPromise = downloadHadFinished(publicList);
+
+  let loadingTab = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser,
+    opening: TEST_PATH + "empty_pdf_file.pdf",
+    waitForLoad: false,
+    waitForStateStop: true,
+  });
+
+  info("Downloading had finished");
+  let download = await downloadFinishedPromise;
+
+  info("Waiting until DownloadIntegration.launchFile is called");
+  await waitForLaunchFileCalled;
+
+  DownloadIntegration.launchFile = oldLaunchFile;
+
+  await removeTheFile(download);
+
+  BrowserTestUtils.removeTab(loadingTab);
+
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_open_migration_wizard.js b/browser/components/preferences/tests/browser_open_migration_wizard.js
new file mode 100644
index 0000000000..9191f80078
--- /dev/null
+++ b/browser/components/preferences/tests/browser_open_migration_wizard.js
@@ -0,0 +1,27 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests the "Import Data" button in the "Import Browser Data" section of
+ * the General pane of about:preferences launches the Migration Wizard.
+ */
+add_task(async function test_open_migration_wizard() {
+  const BUTTON_ID = "data-migration";
+
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "about:preferences#general" },
+    async function (browser) {
+      let button = browser.contentDocument.getElementById(BUTTON_ID);
+
+      let wizardReady = BrowserTestUtils.waitForEvent(
+        browser.contentWindow,
+        "MigrationWizard:Ready"
+      );
+      button.click();
+      await wizardReady;
+      Assert.ok(true, "Saw the new Migration Wizard dialog open.");
+    }
+  );
+});
diff --git a/browser/components/preferences/tests/browser_password_management.js b/browser/components/preferences/tests/browser_password_management.js
new file mode 100644
index 0000000000..d84c88dc08
--- /dev/null
+++ b/browser/components/preferences/tests/browser_password_management.js
@@ -0,0 +1,43 @@
+"use strict";
+
+const { LoginTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/LoginTestUtils.sys.mjs"
+);
+const { TelemetryTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/TelemetryTestUtils.sys.mjs"
+);
+
+var passwordsDialog;
+
+add_task(async function test_openPasswordManagement() {
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+
+  let tabOpenPromise = BrowserTestUtils.waitForNewTab(gBrowser, "about:logins");
+
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], function () {
+    let doc = content.document;
+
+    let savePasswordCheckBox = doc.getElementById("savePasswords");
+    Assert.ok(
+      !savePasswordCheckBox.checked,
+      "Save Password CheckBox should be unchecked by default"
+    );
+
+    let showPasswordsButton = doc.getElementById("showPasswords");
+    showPasswordsButton.click();
+  });
+
+  let tab = await tabOpenPromise;
+  ok(tab, "Tab opened");
+
+  // check telemetry events while we are in here
+  await LoginTestUtils.telemetry.waitForEventCount(1);
+  TelemetryTestUtils.assertEvents(
+    [["pwmgr", "open_management", "preferences"]],
+    { category: "pwmgr", method: "open_management" },
+    { clear: true, process: "content" }
+  );
+
+  BrowserTestUtils.removeTab(tab);
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_pdf_disabled.js b/browser/components/preferences/tests/browser_pdf_disabled.js
new file mode 100644
index 0000000000..5b814b39e9
--- /dev/null
+++ b/browser/components/preferences/tests/browser_pdf_disabled.js
@@ -0,0 +1,49 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// This test checks that pdf always appears in the applications list even
+// both a customized handler doesn't exist and when the internal viewer is
+// not enabled.
+add_task(async function pdfIsAlwaysPresent() {
+  // Try again with the pdf viewer enabled and disabled.
+  for (let test of ["enabled", "disabled"]) {
+    await SpecialPowers.pushPrefEnv({
+      set: [["pdfjs.disabled", test == "disabled"]],
+    });
+
+    await openPreferencesViaOpenPreferencesAPI("general", { leaveOpen: true });
+
+    let win = gBrowser.selectedBrowser.contentWindow;
+
+    let container = win.document.getElementById("handlersView");
+
+    // First, find the PDF item.
+    let pdfItem = container.querySelector(
+      "richlistitem[type='application/pdf']"
+    );
+    Assert.ok(pdfItem, "pdfItem is present in handlersView when " + test);
+    if (pdfItem) {
+      pdfItem.scrollIntoView({ block: "center" });
+      pdfItem.closest("richlistbox").selectItem(pdfItem);
+
+      // Open its menu
+      let list = pdfItem.querySelector(".actionsMenu");
+      let popup = list.menupopup;
+      let popupShown = BrowserTestUtils.waitForEvent(popup, "popupshown");
+      EventUtils.synthesizeMouseAtCenter(list, {}, win);
+      await popupShown;
+
+      let handleInternallyItem = list.querySelector(
+        `menuitem[action='${Ci.nsIHandlerInfo.handleInternally}']`
+      );
+
+      is(
+        test == "enabled",
+        !!handleInternallyItem,
+        "handle internally is present when " + test
+      );
+    }
+
+    gBrowser.removeCurrentTab();
+  }
+});
diff --git a/browser/components/preferences/tests/browser_performance.js b/browser/components/preferences/tests/browser_performance.js
new file mode 100644
index 0000000000..bd7ff70c51
--- /dev/null
+++ b/browser/components/preferences/tests/browser_performance.js
@@ -0,0 +1,300 @@
+const DEFAULT_HW_ACCEL_PREF = Services.prefs
+  .getDefaultBranch(null)
+  .getBoolPref("layers.acceleration.disabled");
+const DEFAULT_PROCESS_COUNT = Services.prefs
+  .getDefaultBranch(null)
+  .getIntPref("dom.ipc.processCount");
+
+add_task(async function () {
+  // We must temporarily disable `Once` StaticPrefs check for the duration of
+  // this test (see bug 1556131). We must do so in a separate operation as
+  // pushPrefEnv doesn't set the preferences in the order one could expect.
+  await SpecialPowers.pushPrefEnv({
+    set: [["preferences.force-disable.check.once.policy", true]],
+  });
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["layers.acceleration.disabled", DEFAULT_HW_ACCEL_PREF],
+      ["dom.ipc.processCount", DEFAULT_PROCESS_COUNT],
+      ["browser.preferences.defaultPerformanceSettings.enabled", true],
+    ],
+  });
+});
+
+add_task(async function () {
+  let prefs = await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneGeneral", "General pane was selected");
+
+  let doc = gBrowser.contentDocument;
+  let useRecommendedPerformanceSettings = doc.querySelector(
+    "#useRecommendedPerformanceSettings"
+  );
+
+  is(
+    Services.prefs.getBoolPref(
+      "browser.preferences.defaultPerformanceSettings.enabled"
+    ),
+    true,
+    "pref value should be true before clicking on checkbox"
+  );
+  ok(
+    useRecommendedPerformanceSettings.checked,
+    "checkbox should be checked before clicking on checkbox"
+  );
+
+  useRecommendedPerformanceSettings.click();
+
+  let performanceSettings = doc.querySelector("#performanceSettings");
+  is(
+    performanceSettings.hidden,
+    false,
+    "performance settings section is shown"
+  );
+
+  is(
+    Services.prefs.getBoolPref(
+      "browser.preferences.defaultPerformanceSettings.enabled"
+    ),
+    false,
+    "pref value should be false after clicking on checkbox"
+  );
+  ok(
+    !useRecommendedPerformanceSettings.checked,
+    "checkbox should not be checked after clicking on checkbox"
+  );
+
+  let allowHWAccel = doc.querySelector("#allowHWAccel");
+  let allowHWAccelPref = Services.prefs.getBoolPref(
+    "layers.acceleration.disabled"
+  );
+  is(
+    allowHWAccelPref,
+    DEFAULT_HW_ACCEL_PREF,
+    "pref value should be the default value before clicking on checkbox"
+  );
+  is(
+    allowHWAccel.checked,
+    !DEFAULT_HW_ACCEL_PREF,
+    "checkbox should show the invert of the default value"
+  );
+
+  let contentProcessCount = doc.querySelector("#contentProcessCount");
+  is(
+    contentProcessCount.disabled,
+    false,
+    "process count control should be enabled"
+  );
+  is(
+    Services.prefs.getIntPref("dom.ipc.processCount"),
+    DEFAULT_PROCESS_COUNT,
+    "default pref value should be default value"
+  );
+  is(
+    contentProcessCount.selectedItem.value,
+    "" + DEFAULT_PROCESS_COUNT,
+    "selected item should be the default one"
+  );
+
+  allowHWAccel.click();
+  allowHWAccelPref = Services.prefs.getBoolPref("layers.acceleration.disabled");
+  is(
+    allowHWAccelPref,
+    !DEFAULT_HW_ACCEL_PREF,
+    "pref value should be opposite of the default value after clicking on checkbox"
+  );
+  is(
+    allowHWAccel.checked,
+    !allowHWAccelPref,
+    "checkbox should show the invert of the current value"
+  );
+
+  contentProcessCount.value = 7;
+  contentProcessCount.doCommand();
+  is(
+    Services.prefs.getIntPref("dom.ipc.processCount"),
+    7,
+    "pref value should be 7"
+  );
+  is(contentProcessCount.selectedItem.value, "7", "selected item should be 7");
+
+  allowHWAccel.click();
+  allowHWAccelPref = Services.prefs.getBoolPref("layers.acceleration.disabled");
+  is(
+    allowHWAccelPref,
+    DEFAULT_HW_ACCEL_PREF,
+    "pref value should be the default value after clicking on checkbox"
+  );
+  is(
+    allowHWAccel.checked,
+    !allowHWAccelPref,
+    "checkbox should show the invert of the current value"
+  );
+
+  contentProcessCount.value = DEFAULT_PROCESS_COUNT;
+  contentProcessCount.doCommand();
+  is(
+    Services.prefs.getIntPref("dom.ipc.processCount"),
+    DEFAULT_PROCESS_COUNT,
+    "pref value should be default value"
+  );
+  is(
+    contentProcessCount.selectedItem.value,
+    "" + DEFAULT_PROCESS_COUNT,
+    "selected item should be default one"
+  );
+
+  is(
+    performanceSettings.hidden,
+    false,
+    "performance settings section should be still shown"
+  );
+
+  Services.prefs.setBoolPref(
+    "browser.preferences.defaultPerformanceSettings.enabled",
+    true
+  );
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function () {
+  let prefs = await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneGeneral", "General pane was selected");
+
+  let doc = gBrowser.contentDocument;
+  let useRecommendedPerformanceSettings = doc.querySelector(
+    "#useRecommendedPerformanceSettings"
+  );
+  let allowHWAccel = doc.querySelector("#allowHWAccel");
+  let contentProcessCount = doc.querySelector("#contentProcessCount");
+  let performanceSettings = doc.querySelector("#performanceSettings");
+
+  useRecommendedPerformanceSettings.click();
+  allowHWAccel.click();
+  contentProcessCount.value = 7;
+  contentProcessCount.doCommand();
+  useRecommendedPerformanceSettings.click();
+
+  is(
+    Services.prefs.getBoolPref(
+      "browser.preferences.defaultPerformanceSettings.enabled"
+    ),
+    true,
+    "pref value should be true before clicking on checkbox"
+  );
+  ok(
+    useRecommendedPerformanceSettings.checked,
+    "checkbox should be checked before clicking on checkbox"
+  );
+  is(
+    performanceSettings.hidden,
+    true,
+    "performance settings section should be still shown"
+  );
+
+  Services.prefs.setBoolPref(
+    "browser.preferences.defaultPerformanceSettings.enabled",
+    true
+  );
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function () {
+  let prefs = await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneGeneral", "General pane was selected");
+
+  let doc = gBrowser.contentDocument;
+  let performanceSettings = doc.querySelector("#performanceSettings");
+
+  is(
+    performanceSettings.hidden,
+    true,
+    "performance settings section should not be shown"
+  );
+
+  Services.prefs.setBoolPref(
+    "browser.preferences.defaultPerformanceSettings.enabled",
+    false
+  );
+
+  is(
+    performanceSettings.hidden,
+    false,
+    "performance settings section should be shown"
+  );
+
+  Services.prefs.setBoolPref(
+    "browser.preferences.defaultPerformanceSettings.enabled",
+    true
+  );
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function () {
+  Services.prefs.setIntPref("dom.ipc.processCount", 7);
+
+  let prefs = await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneGeneral", "General pane was selected");
+
+  let doc = gBrowser.contentDocument;
+
+  let performanceSettings = doc.querySelector("#performanceSettings");
+  is(
+    performanceSettings.hidden,
+    false,
+    "performance settings section should be shown"
+  );
+
+  let contentProcessCount = doc.querySelector("#contentProcessCount");
+  is(
+    Services.prefs.getIntPref("dom.ipc.processCount"),
+    7,
+    "pref value should be 7"
+  );
+  is(contentProcessCount.selectedItem.value, "7", "selected item should be 7");
+
+  Services.prefs.setBoolPref(
+    "browser.preferences.defaultPerformanceSettings.enabled",
+    true
+  );
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function () {
+  Services.prefs.setBoolPref("layers.acceleration.disabled", true);
+
+  let prefs = await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneGeneral", "General pane was selected");
+
+  let doc = gBrowser.contentDocument;
+
+  let performanceSettings = doc.querySelector("#performanceSettings");
+  is(
+    performanceSettings.hidden,
+    false,
+    "performance settings section should be shown"
+  );
+
+  let allowHWAccel = doc.querySelector("#allowHWAccel");
+  is(
+    Services.prefs.getBoolPref("layers.acceleration.disabled"),
+    true,
+    "pref value is false"
+  );
+  ok(!allowHWAccel.checked, "checkbox should not be checked");
+
+  Services.prefs.setBoolPref(
+    "browser.preferences.defaultPerformanceSettings.enabled",
+    true
+  );
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_performance_content_process_limit.js b/browser/components/preferences/tests/browser_performance_content_process_limit.js
new file mode 100644
index 0000000000..7ac5c354bd
--- /dev/null
+++ b/browser/components/preferences/tests/browser_performance_content_process_limit.js
@@ -0,0 +1,52 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.defaultPerformanceSettings.enabled", false]],
+  });
+
+  let prefs = await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneGeneral", "General pane was selected");
+
+  let doc = gBrowser.contentDocument;
+
+  let limitContentProcess = doc.querySelector("#limitContentProcess");
+  is(
+    limitContentProcess.hidden,
+    Services.appinfo.fissionAutostart,
+    "Limit Content Process should be hidden if fission is enabled and shown if it is not."
+  );
+
+  let contentProcessCount = doc.querySelector("#contentProcessCount");
+  is(
+    contentProcessCount.hidden,
+    Services.appinfo.fissionAutostart,
+    "Limit Content Count should be hidden if fission is enabled and shown if it is not."
+  );
+
+  let contentProcessCountEnabledDescription = doc.querySelector(
+    "#contentProcessCountEnabledDescription"
+  );
+  is(
+    contentProcessCountEnabledDescription.hidden,
+    Services.appinfo.fissionAutostart,
+    "Limit Content Process Enabled Description should be hidden if fission is enabled and shown if it is not."
+  );
+
+  let contentProcessCountDisabledDescription = doc.querySelector(
+    "#contentProcessCountDisabledDescription"
+  );
+  is(
+    contentProcessCountDisabledDescription.hidden,
+    Services.appinfo.fissionAutostart ||
+      Services.appinfo.browserTabsRemoteAutostart,
+    "Limit Content Process Disabled Description should be shown if e10s is disabled, and hidden otherwise."
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_performance_e10srollout.js b/browser/components/preferences/tests/browser_performance_e10srollout.js
new file mode 100644
index 0000000000..1c2c57b6e7
--- /dev/null
+++ b/browser/components/preferences/tests/browser_performance_e10srollout.js
@@ -0,0 +1,164 @@
+const DEFAULT_HW_ACCEL_PREF = Services.prefs
+  .getDefaultBranch(null)
+  .getBoolPref("layers.acceleration.disabled");
+const DEFAULT_PROCESS_COUNT = Services.prefs
+  .getDefaultBranch(null)
+  .getIntPref("dom.ipc.processCount");
+
+add_task(async function () {
+  // We must temporarily disable `Once` StaticPrefs check for the duration of
+  // this test (see bug 1556131). We must do so in a separate operation as
+  // pushPrefEnv doesn't set the preferences in the order one could expect.
+  await SpecialPowers.pushPrefEnv({
+    set: [["preferences.force-disable.check.once.policy", true]],
+  });
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["layers.acceleration.disabled", DEFAULT_HW_ACCEL_PREF],
+      ["dom.ipc.processCount", DEFAULT_PROCESS_COUNT],
+      ["browser.preferences.defaultPerformanceSettings.enabled", true],
+    ],
+  });
+});
+
+add_task(async function testPrefsAreDefault() {
+  Services.prefs.setIntPref("dom.ipc.processCount", DEFAULT_PROCESS_COUNT);
+  Services.prefs.setBoolPref(
+    "browser.preferences.defaultPerformanceSettings.enabled",
+    true
+  );
+
+  let prefs = await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneGeneral", "General pane was selected");
+
+  let doc = gBrowser.contentDocument;
+  let useRecommendedPerformanceSettings = doc.querySelector(
+    "#useRecommendedPerformanceSettings"
+  );
+
+  is(
+    Services.prefs.getBoolPref(
+      "browser.preferences.defaultPerformanceSettings.enabled"
+    ),
+    true,
+    "pref value should be true before clicking on checkbox"
+  );
+  ok(
+    useRecommendedPerformanceSettings.checked,
+    "checkbox should be checked before clicking on checkbox"
+  );
+
+  useRecommendedPerformanceSettings.click();
+
+  let performanceSettings = doc.querySelector("#performanceSettings");
+  is(
+    performanceSettings.hidden,
+    false,
+    "performance settings section is shown"
+  );
+
+  is(
+    Services.prefs.getBoolPref(
+      "browser.preferences.defaultPerformanceSettings.enabled"
+    ),
+    false,
+    "pref value should be false after clicking on checkbox"
+  );
+  ok(
+    !useRecommendedPerformanceSettings.checked,
+    "checkbox should not be checked after clicking on checkbox"
+  );
+
+  let contentProcessCount = doc.querySelector("#contentProcessCount");
+  is(
+    contentProcessCount.disabled,
+    false,
+    "process count control should be enabled"
+  );
+  is(
+    Services.prefs.getIntPref("dom.ipc.processCount"),
+    DEFAULT_PROCESS_COUNT,
+    "default pref should be default value"
+  );
+  is(
+    contentProcessCount.selectedItem.value,
+    "" + DEFAULT_PROCESS_COUNT,
+    "selected item should be the default one"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  Services.prefs.clearUserPref("dom.ipc.processCount");
+  Services.prefs.setBoolPref(
+    "browser.preferences.defaultPerformanceSettings.enabled",
+    true
+  );
+});
+
+add_task(async function testPrefsSetByUser() {
+  const kNewCount = DEFAULT_PROCESS_COUNT - 2;
+
+  Services.prefs.setIntPref("dom.ipc.processCount", kNewCount);
+  Services.prefs.setBoolPref(
+    "browser.preferences.defaultPerformanceSettings.enabled",
+    false
+  );
+
+  let prefs = await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneGeneral", "General pane was selected");
+
+  let doc = gBrowser.contentDocument;
+  let performanceSettings = doc.querySelector("#performanceSettings");
+  is(
+    performanceSettings.hidden,
+    false,
+    "performance settings section is shown"
+  );
+
+  let contentProcessCount = doc.querySelector("#contentProcessCount");
+  is(
+    contentProcessCount.disabled,
+    false,
+    "process count control should be enabled"
+  );
+  is(
+    Services.prefs.getIntPref("dom.ipc.processCount"),
+    kNewCount,
+    "process count should be the set value"
+  );
+  is(
+    contentProcessCount.selectedItem.value,
+    "" + kNewCount,
+    "selected item should be the set one"
+  );
+
+  let useRecommendedPerformanceSettings = doc.querySelector(
+    "#useRecommendedPerformanceSettings"
+  );
+  useRecommendedPerformanceSettings.click();
+
+  is(
+    Services.prefs.getBoolPref(
+      "browser.preferences.defaultPerformanceSettings.enabled"
+    ),
+    true,
+    "pref value should be true after clicking on checkbox"
+  );
+  is(
+    Services.prefs.getIntPref("dom.ipc.processCount"),
+    DEFAULT_PROCESS_COUNT,
+    "process count should be default value"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  Services.prefs.clearUserPref("dom.ipc.processCount");
+  Services.prefs.setBoolPref(
+    "browser.preferences.defaultPerformanceSettings.enabled",
+    true
+  );
+});
diff --git a/browser/components/preferences/tests/browser_performance_non_e10s.js b/browser/components/preferences/tests/browser_performance_non_e10s.js
new file mode 100644
index 0000000000..169afcaaa6
--- /dev/null
+++ b/browser/components/preferences/tests/browser_performance_non_e10s.js
@@ -0,0 +1,210 @@
+const DEFAULT_HW_ACCEL_PREF = Services.prefs
+  .getDefaultBranch(null)
+  .getBoolPref("layers.acceleration.disabled");
+const DEFAULT_PROCESS_COUNT = Services.prefs
+  .getDefaultBranch(null)
+  .getIntPref("dom.ipc.processCount");
+
+add_task(async function () {
+  // We must temporarily disable `Once` StaticPrefs check for the duration of
+  // this test (see bug 1556131). We must do so in a separate operation as
+  // pushPrefEnv doesn't set the preferences in the order one could expect.
+  await SpecialPowers.pushPrefEnv({
+    set: [["preferences.force-disable.check.once.policy", true]],
+  });
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["layers.acceleration.disabled", DEFAULT_HW_ACCEL_PREF],
+      ["dom.ipc.processCount", DEFAULT_PROCESS_COUNT],
+      ["browser.preferences.defaultPerformanceSettings.enabled", true],
+    ],
+  });
+});
+
+add_task(async function () {
+  let prefs = await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneGeneral", "General pane was selected");
+
+  let doc = gBrowser.contentDocument;
+  let useRecommendedPerformanceSettings = doc.querySelector(
+    "#useRecommendedPerformanceSettings"
+  );
+
+  is(
+    Services.prefs.getBoolPref(
+      "browser.preferences.defaultPerformanceSettings.enabled"
+    ),
+    true,
+    "pref value should be true before clicking on checkbox"
+  );
+  ok(
+    useRecommendedPerformanceSettings.checked,
+    "checkbox should be checked before clicking on checkbox"
+  );
+
+  useRecommendedPerformanceSettings.click();
+
+  let performanceSettings = doc.querySelector("#performanceSettings");
+  is(
+    performanceSettings.hidden,
+    false,
+    "performance settings section is shown"
+  );
+
+  is(
+    Services.prefs.getBoolPref(
+      "browser.preferences.defaultPerformanceSettings.enabled"
+    ),
+    false,
+    "pref value should be false after clicking on checkbox"
+  );
+  ok(
+    !useRecommendedPerformanceSettings.checked,
+    "checkbox should not be checked after clicking on checkbox"
+  );
+
+  let allowHWAccel = doc.querySelector("#allowHWAccel");
+  let allowHWAccelPref = Services.prefs.getBoolPref(
+    "layers.acceleration.disabled"
+  );
+  is(
+    allowHWAccelPref,
+    DEFAULT_HW_ACCEL_PREF,
+    "pref value should be the default value before clicking on checkbox"
+  );
+  is(
+    allowHWAccel.checked,
+    !DEFAULT_HW_ACCEL_PREF,
+    "checkbox should show the invert of the default value"
+  );
+
+  let contentProcessCount = doc.querySelector("#contentProcessCount");
+  is(
+    contentProcessCount.disabled,
+    true,
+    "process count control should be disabled"
+  );
+
+  let contentProcessCountEnabledDescription = doc.querySelector(
+    "#contentProcessCountEnabledDescription"
+  );
+  is(
+    contentProcessCountEnabledDescription.hidden,
+    true,
+    "process count enabled description should be hidden"
+  );
+
+  let contentProcessCountDisabledDescription = doc.querySelector(
+    "#contentProcessCountDisabledDescription"
+  );
+  is(
+    contentProcessCountDisabledDescription.hidden,
+    false,
+    "process count enabled description should be shown"
+  );
+
+  allowHWAccel.click();
+  allowHWAccelPref = Services.prefs.getBoolPref("layers.acceleration.disabled");
+  is(
+    allowHWAccelPref,
+    !DEFAULT_HW_ACCEL_PREF,
+    "pref value should be opposite of the default value after clicking on checkbox"
+  );
+  is(
+    allowHWAccel.checked,
+    !allowHWAccelPref,
+    "checkbox should show the invert of the current value"
+  );
+
+  allowHWAccel.click();
+  allowHWAccelPref = Services.prefs.getBoolPref("layers.acceleration.disabled");
+  is(
+    allowHWAccelPref,
+    DEFAULT_HW_ACCEL_PREF,
+    "pref value should be the default value after clicking on checkbox"
+  );
+  is(
+    allowHWAccel.checked,
+    !allowHWAccelPref,
+    "checkbox should show the invert of the current value"
+  );
+
+  is(
+    performanceSettings.hidden,
+    false,
+    "performance settings section should be still shown"
+  );
+
+  Services.prefs.setBoolPref(
+    "browser.preferences.defaultPerformanceSettings.enabled",
+    true
+  );
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function () {
+  let prefs = await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneGeneral", "General pane was selected");
+
+  let doc = gBrowser.contentDocument;
+  let performanceSettings = doc.querySelector("#performanceSettings");
+
+  is(
+    performanceSettings.hidden,
+    true,
+    "performance settings section should not be shown"
+  );
+
+  Services.prefs.setBoolPref(
+    "browser.preferences.defaultPerformanceSettings.enabled",
+    false
+  );
+
+  is(
+    performanceSettings.hidden,
+    false,
+    "performance settings section should be shown"
+  );
+
+  Services.prefs.setBoolPref(
+    "browser.preferences.defaultPerformanceSettings.enabled",
+    true
+  );
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function () {
+  Services.prefs.setBoolPref("layers.acceleration.disabled", true);
+
+  let prefs = await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneGeneral", "General pane was selected");
+
+  let doc = gBrowser.contentDocument;
+
+  let performanceSettings = doc.querySelector("#performanceSettings");
+  is(
+    performanceSettings.hidden,
+    false,
+    "performance settings section should be shown"
+  );
+
+  let allowHWAccel = doc.querySelector("#allowHWAccel");
+  is(
+    Services.prefs.getBoolPref("layers.acceleration.disabled"),
+    true,
+    "pref value is false"
+  );
+  ok(!allowHWAccel.checked, "checkbox should not be checked");
+
+  Services.prefs.setBoolPref(
+    "browser.preferences.defaultPerformanceSettings.enabled",
+    true
+  );
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_permissions_checkPermissionsWereAdded.js b/browser/components/preferences/tests/browser_permissions_checkPermissionsWereAdded.js
new file mode 100644
index 0000000000..c56c32222d
--- /dev/null
+++ b/browser/components/preferences/tests/browser_permissions_checkPermissionsWereAdded.js
@@ -0,0 +1,149 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const PERMISSIONS_URL =
+  "chrome://browser/content/preferences/dialogs/permissions.xhtml";
+
+const _checkAndOpenCookiesDialog = async doc => {
+  let cookieExceptionsButton = doc.getElementById("cookieExceptions");
+  ok(cookieExceptionsButton, "cookieExceptionsButton found");
+  let dialogPromise = promiseLoadSubDialog(PERMISSIONS_URL);
+  cookieExceptionsButton.click();
+  let dialog = await dialogPromise;
+  return dialog;
+};
+
+const _checkCookiesDialog = (dialog, buttonIds) => {
+  ok(dialog, "dialog loaded");
+  let urlLabel = dialog.document.getElementById("urlLabel");
+  ok(!urlLabel.hidden, "urlLabel should be visible");
+  let url = dialog.document.getElementById("url");
+  ok(!url.hidden, "url should be visible");
+  for (let buttonId of buttonIds) {
+    let buttonDialog = dialog.document.getElementById(buttonId);
+    ok(buttonDialog, "blockButtonDialog found");
+    is(
+      buttonDialog.hasAttribute("disabled"),
+      true,
+      "If the user hasn't added an url the button shouldn't be clickable"
+    );
+  }
+  return dialog;
+};
+
+const _addWebsiteAddressToPermissionBox = (
+  websiteAddress,
+  dialog,
+  buttonId,
+  expectError
+) => {
+  let url = dialog.document.getElementById("url");
+  let buttonDialog = dialog.document.getElementById(buttonId);
+  url.value = websiteAddress;
+  url.dispatchEvent(new Event("input", { bubbles: true }));
+  is(
+    buttonDialog.hasAttribute("disabled"),
+    false,
+    "When the user add an url the button should be clickable"
+  );
+  buttonDialog.click();
+  let permissionsBox = dialog.document.getElementById("permissionsBox");
+  let children = permissionsBox.getElementsByAttribute("origin", "*");
+  is(
+    !!children.length,
+    !expectError,
+    "Website added in url should be in the list"
+  );
+};
+
+const _checkIfPermissionsWereAdded = (dialog, expectedResult) => {
+  let permissionsBox = dialog.document.getElementById("permissionsBox");
+  for (let website of expectedResult) {
+    let elements = permissionsBox.getElementsByAttribute("origin", website);
+    is(elements.length, 1, "It should find only one coincidence");
+  }
+};
+
+const _removesAllSitesInPermissionBox = (dialog, shouldBePossible) => {
+  let removeAllWebsitesButton = dialog.document.getElementById(
+    "removeAllPermissions"
+  );
+  ok(removeAllWebsitesButton, "removeAllWebsitesButton found");
+  const isDisabled = removeAllWebsitesButton.hasAttribute("disabled");
+  is(
+    !removeAllWebsitesButton.hasAttribute("disabled"),
+    shouldBePossible,
+    "There should be websites in the list"
+  );
+  if (!isDisabled) {
+    removeAllWebsitesButton.click();
+  }
+};
+
+add_task(async function checkCookiePermissions() {
+  await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+  let win = gBrowser.selectedBrowser.contentWindow;
+  let doc = win.document;
+  let buttonIds = ["btnBlock", "btnCookieSession", "btnAllow"];
+
+  let dialog = await _checkAndOpenCookiesDialog(doc);
+  _checkCookiesDialog(dialog, buttonIds);
+
+  let tests = [
+    {
+      inputWebsite: "google.com",
+      expectedResult: ["http://google.com", "https://google.com"],
+    },
+    {
+      inputWebsite: "https://google.com",
+      expectedResult: ["https://google.com"],
+    },
+    {
+      inputWebsite: "s3.eu-central-1.amazonaws.com",
+      expectedResult: [
+        "http://s3.eu-central-1.amazonaws.com",
+        "https://s3.eu-central-1.amazonaws.com",
+      ],
+    },
+    {
+      inputWebsite: "file://",
+      expectedResult: ["file:///"],
+    },
+    {
+      inputWebsite: "about:config",
+      expectedResult: ["about:config"],
+    },
+    // Invalid inputs, expected to not be added
+    {
+      inputWebsite: "http://",
+      expectedResult: [],
+    },
+    {
+      inputWebsite: "*.example.com",
+      expectedResult: [],
+    },
+    {
+      inputWebsite: "http://*.example.com",
+      expectedResult: [],
+    },
+  ];
+
+  for (let buttonId of buttonIds) {
+    for (let test of tests) {
+      _addWebsiteAddressToPermissionBox(
+        test.inputWebsite,
+        dialog,
+        buttonId,
+        test.expectedResult.length === 0
+      );
+      _checkIfPermissionsWereAdded(dialog, test.expectedResult);
+      _removesAllSitesInPermissionBox(dialog, !!test.expectedResult.length);
+    }
+  }
+
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_permissions_dialog.js b/browser/components/preferences/tests/browser_permissions_dialog.js
new file mode 100644
index 0000000000..097c2f15aa
--- /dev/null
+++ b/browser/components/preferences/tests/browser_permissions_dialog.js
@@ -0,0 +1,641 @@
+"use strict";
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const PERMISSIONS_URL =
+  "chrome://browser/content/preferences/dialogs/sitePermissions.xhtml";
+const URL = "http://www.example.com";
+const URI = Services.io.newURI(URL);
+var sitePermissionsDialog;
+let settingsButtonMap = {
+  "desktop-notification": "notificationSettingsButton",
+  speaker: "speakerSettingsButton",
+};
+
+function checkMenulistPermissionItem(origin, state) {
+  let doc = sitePermissionsDialog.document;
+
+  let label = doc.getElementsByTagName("label")[3];
+  Assert.equal(label.textContent, origin);
+
+  let menulist = doc.getElementsByTagName("menulist")[0];
+  Assert.equal(menulist.value, state);
+}
+
+async function openPermissionsDialog(permissionType) {
+  let dialogOpened = promiseLoadSubDialog(PERMISSIONS_URL);
+  await SpecialPowers.spawn(
+    gBrowser.selectedBrowser,
+    [settingsButtonMap[permissionType]],
+    function (settingsButtonId) {
+      let doc = content.document;
+      let settingsButton = doc.getElementById(settingsButtonId);
+      settingsButton.click();
+    }
+  );
+
+  sitePermissionsDialog = await dialogOpened;
+  await sitePermissionsDialog.document.mozSubdialogReady;
+}
+
+add_task(async function openSitePermissionsDialog() {
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  await openPermissionsDialog("desktop-notification");
+});
+
+add_task(async function addPermission() {
+  let doc = sitePermissionsDialog.document;
+  let richlistbox = doc.getElementById("permissionsBox");
+
+  // First item in the richlistbox contains column headers.
+  Assert.equal(
+    richlistbox.itemCount,
+    0,
+    "Number of permission items is 0 initially"
+  );
+
+  // Add notification permission for a website.
+  PermissionTestUtils.add(
+    URI,
+    "desktop-notification",
+    Services.perms.ALLOW_ACTION
+  );
+
+  // Observe the added permission changes in the dialog UI.
+  Assert.equal(richlistbox.itemCount, 1);
+  checkMenulistPermissionItem(URL, Services.perms.ALLOW_ACTION);
+
+  PermissionTestUtils.remove(URI, "desktop-notification");
+});
+
+add_task(async function addPermissionPrivateBrowsing() {
+  let privateBrowsingPrincipal =
+    Services.scriptSecurityManager.createContentPrincipal(URI, {
+      privateBrowsingId: 1,
+    });
+  let doc = sitePermissionsDialog.document;
+  let richlistbox = doc.getElementById("permissionsBox");
+
+  Assert.equal(
+    richlistbox.itemCount,
+    0,
+    "Number of permission items is 0 initially"
+  );
+
+  // Add a session permission for private browsing.
+  PermissionTestUtils.add(
+    privateBrowsingPrincipal,
+    "desktop-notification",
+    Services.perms.ALLOW_ACTION,
+    Services.perms.EXPIRE_SESSION
+  );
+
+  // The permission should not show in the dialog UI.
+  Assert.equal(richlistbox.itemCount, 0);
+
+  PermissionTestUtils.remove(privateBrowsingPrincipal, "desktop-notification");
+
+  // Add a permanent permission for private browsing
+  // The permission manager will store it as EXPIRE_SESSION
+  PermissionTestUtils.add(
+    privateBrowsingPrincipal,
+    "desktop-notification",
+    Services.perms.ALLOW_ACTION
+  );
+
+  // The permission should not show in the dialog UI.
+  Assert.equal(richlistbox.itemCount, 0);
+
+  PermissionTestUtils.remove(privateBrowsingPrincipal, "desktop-notification");
+});
+
+add_task(async function observePermissionChange() {
+  PermissionTestUtils.add(
+    URI,
+    "desktop-notification",
+    Services.perms.ALLOW_ACTION
+  );
+
+  // Change the permission.
+  PermissionTestUtils.add(
+    URI,
+    "desktop-notification",
+    Services.perms.DENY_ACTION
+  );
+
+  checkMenulistPermissionItem(URL, Services.perms.DENY_ACTION);
+
+  PermissionTestUtils.remove(URI, "desktop-notification");
+});
+
+add_task(async function observePermissionDelete() {
+  let doc = sitePermissionsDialog.document;
+  let richlistbox = doc.getElementById("permissionsBox");
+
+  PermissionTestUtils.add(
+    URI,
+    "desktop-notification",
+    Services.perms.ALLOW_ACTION
+  );
+
+  Assert.equal(
+    richlistbox.itemCount,
+    1,
+    "The box contains one permission item initially"
+  );
+
+  PermissionTestUtils.remove(URI, "desktop-notification");
+
+  Assert.equal(richlistbox.itemCount, 0);
+});
+
+add_task(async function onPermissionChange() {
+  let doc = sitePermissionsDialog.document;
+  PermissionTestUtils.add(
+    URI,
+    "desktop-notification",
+    Services.perms.ALLOW_ACTION
+  );
+
+  // Change the permission state in the UI.
+  doc.getElementsByAttribute("value", SitePermissions.BLOCK)[0].click();
+
+  Assert.equal(
+    PermissionTestUtils.getPermissionObject(URI, "desktop-notification")
+      .capability,
+    Services.perms.ALLOW_ACTION,
+    "Permission state does not change before saving changes"
+  );
+
+  doc.querySelector("dialog").getButton("accept").click();
+
+  await TestUtils.waitForCondition(
+    () =>
+      PermissionTestUtils.getPermissionObject(URI, "desktop-notification")
+        .capability == Services.perms.DENY_ACTION
+  );
+
+  PermissionTestUtils.remove(URI, "desktop-notification");
+});
+
+add_task(async function onPermissionDelete() {
+  await openPermissionsDialog("desktop-notification");
+
+  let doc = sitePermissionsDialog.document;
+  let richlistbox = doc.getElementById("permissionsBox");
+
+  PermissionTestUtils.add(
+    URI,
+    "desktop-notification",
+    Services.perms.ALLOW_ACTION
+  );
+
+  richlistbox.selectItem(richlistbox.getItemAtIndex(0));
+  doc.getElementById("removePermission").click();
+
+  await TestUtils.waitForCondition(() => richlistbox.itemCount == 0);
+
+  Assert.equal(
+    PermissionTestUtils.getPermissionObject(URI, "desktop-notification")
+      .capability,
+    Services.perms.ALLOW_ACTION,
+    "Permission is not deleted before saving changes"
+  );
+
+  doc.querySelector("dialog").getButton("accept").click();
+
+  await TestUtils.waitForCondition(
+    () =>
+      PermissionTestUtils.getPermissionObject(URI, "desktop-notification") ==
+      null
+  );
+});
+
+add_task(async function onAllPermissionsDelete() {
+  await openPermissionsDialog("desktop-notification");
+
+  let doc = sitePermissionsDialog.document;
+  let richlistbox = doc.getElementById("permissionsBox");
+
+  PermissionTestUtils.add(
+    URI,
+    "desktop-notification",
+    Services.perms.ALLOW_ACTION
+  );
+  let u = Services.io.newURI("http://www.test.com");
+  PermissionTestUtils.add(
+    u,
+    "desktop-notification",
+    Services.perms.ALLOW_ACTION
+  );
+
+  doc.getElementById("removeAllPermissions").click();
+  await TestUtils.waitForCondition(() => richlistbox.itemCount == 0);
+
+  Assert.equal(
+    PermissionTestUtils.getPermissionObject(URI, "desktop-notification")
+      .capability,
+    Services.perms.ALLOW_ACTION
+  );
+  Assert.equal(
+    PermissionTestUtils.getPermissionObject(u, "desktop-notification")
+      .capability,
+    Services.perms.ALLOW_ACTION,
+    "Permissions are not deleted before saving changes"
+  );
+
+  doc.querySelector("dialog").getButton("accept").click();
+
+  await TestUtils.waitForCondition(
+    () =>
+      PermissionTestUtils.getPermissionObject(URI, "desktop-notification") ==
+        null &&
+      PermissionTestUtils.getPermissionObject(u, "desktop-notification") == null
+  );
+});
+
+add_task(async function onPermissionChangeAndDelete() {
+  await openPermissionsDialog("desktop-notification");
+
+  let doc = sitePermissionsDialog.document;
+  let richlistbox = doc.getElementById("permissionsBox");
+
+  PermissionTestUtils.add(
+    URI,
+    "desktop-notification",
+    Services.perms.ALLOW_ACTION
+  );
+
+  // Change the permission state in the UI.
+  doc.getElementsByAttribute("value", SitePermissions.BLOCK)[0].click();
+
+  // Remove that permission by clicking the "Remove" button.
+  richlistbox.selectItem(richlistbox.getItemAtIndex(0));
+  doc.getElementById("removePermission").click();
+
+  await TestUtils.waitForCondition(() => richlistbox.itemCount == 0);
+
+  doc.querySelector("dialog").getButton("accept").click();
+
+  await TestUtils.waitForCondition(
+    () =>
+      PermissionTestUtils.getPermissionObject(URI, "desktop-notification") ==
+      null
+  );
+});
+
+add_task(async function onPermissionChangeCancel() {
+  await openPermissionsDialog("desktop-notification");
+
+  let doc = sitePermissionsDialog.document;
+  PermissionTestUtils.add(
+    URI,
+    "desktop-notification",
+    Services.perms.ALLOW_ACTION
+  );
+
+  // Change the permission state in the UI.
+  doc.getElementsByAttribute("value", SitePermissions.BLOCK)[0].click();
+
+  doc.querySelector("dialog").getButton("cancel").click();
+
+  Assert.equal(
+    PermissionTestUtils.getPermissionObject(URI, "desktop-notification")
+      .capability,
+    Services.perms.ALLOW_ACTION,
+    "Permission state does not change on clicking cancel"
+  );
+
+  PermissionTestUtils.remove(URI, "desktop-notification");
+});
+
+add_task(async function onPermissionDeleteCancel() {
+  await openPermissionsDialog("desktop-notification");
+
+  let doc = sitePermissionsDialog.document;
+  let richlistbox = doc.getElementById("permissionsBox");
+  PermissionTestUtils.add(
+    URI,
+    "desktop-notification",
+    Services.perms.ALLOW_ACTION
+  );
+
+  // Remove that permission by clicking the "Remove" button.
+  richlistbox.selectItem(richlistbox.getItemAtIndex(0));
+  doc.getElementById("removePermission").click();
+
+  await TestUtils.waitForCondition(() => richlistbox.itemCount == 0);
+
+  doc.querySelector("dialog").getButton("cancel").click();
+
+  Assert.equal(
+    PermissionTestUtils.getPermissionObject(URI, "desktop-notification")
+      .capability,
+    Services.perms.ALLOW_ACTION,
+    "Permission state does not change on clicking cancel"
+  );
+
+  PermissionTestUtils.remove(URI, "desktop-notification");
+});
+
+add_task(async function onSearch() {
+  await openPermissionsDialog("desktop-notification");
+  let doc = sitePermissionsDialog.document;
+  let richlistbox = doc.getElementById("permissionsBox");
+  let searchBox = doc.getElementById("searchBox");
+
+  PermissionTestUtils.add(
+    URI,
+    "desktop-notification",
+    Services.perms.ALLOW_ACTION
+  );
+  searchBox.value = "www.example.com";
+
+  let u = Services.io.newURI("http://www.test.com");
+  PermissionTestUtils.add(
+    u,
+    "desktop-notification",
+    Services.perms.ALLOW_ACTION
+  );
+
+  Assert.equal(
+    doc.getElementsByAttribute("origin", "http://www.test.com")[0],
+    null
+  );
+  Assert.equal(
+    doc.getElementsByAttribute("origin", "http://www.example.com")[0],
+    richlistbox.getItemAtIndex(0)
+  );
+
+  PermissionTestUtils.remove(URI, "desktop-notification");
+  PermissionTestUtils.remove(u, "desktop-notification");
+
+  doc.querySelector("dialog").getButton("cancel").click();
+});
+
+add_task(async function onPermissionsSort() {
+  PermissionTestUtils.add(
+    URI,
+    "desktop-notification",
+    Services.perms.ALLOW_ACTION
+  );
+  let u = Services.io.newURI("http://www.test.com");
+  PermissionTestUtils.add(
+    u,
+    "desktop-notification",
+    Services.perms.DENY_ACTION
+  );
+
+  await openPermissionsDialog("desktop-notification");
+  let doc = sitePermissionsDialog.document;
+  let richlistbox = doc.getElementById("permissionsBox");
+
+  // Test default arrangement(Allow followed by Block).
+  Assert.equal(
+    richlistbox.getItemAtIndex(0).getAttribute("origin"),
+    "http://www.example.com"
+  );
+  Assert.equal(
+    richlistbox.getItemAtIndex(1).getAttribute("origin"),
+    "http://www.test.com"
+  );
+
+  doc.getElementById("statusCol").click();
+
+  // Test the rearrangement(Block followed by Allow).
+  Assert.equal(
+    richlistbox.getItemAtIndex(0).getAttribute("origin"),
+    "http://www.test.com"
+  );
+  Assert.equal(
+    richlistbox.getItemAtIndex(1).getAttribute("origin"),
+    "http://www.example.com"
+  );
+
+  doc.getElementById("siteCol").click();
+
+  // Test the rearrangement(Website names arranged in alphabhetical order).
+  Assert.equal(
+    richlistbox.getItemAtIndex(0).getAttribute("origin"),
+    "http://www.example.com"
+  );
+  Assert.equal(
+    richlistbox.getItemAtIndex(1).getAttribute("origin"),
+    "http://www.test.com"
+  );
+
+  doc.getElementById("siteCol").click();
+
+  // Test the rearrangement(Website names arranged in reverse alphabhetical order).
+  Assert.equal(
+    richlistbox.getItemAtIndex(0).getAttribute("origin"),
+    "http://www.test.com"
+  );
+  Assert.equal(
+    richlistbox.getItemAtIndex(1).getAttribute("origin"),
+    "http://www.example.com"
+  );
+
+  PermissionTestUtils.remove(URI, "desktop-notification");
+  PermissionTestUtils.remove(u, "desktop-notification");
+
+  doc.querySelector("dialog").getButton("cancel").click();
+});
+
+add_task(async function onPermissionDisable() {
+  // Enable desktop-notification permission prompts.
+  Services.prefs.setIntPref(
+    "permissions.default.desktop-notification",
+    SitePermissions.UNKNOWN
+  );
+
+  await openPermissionsDialog("desktop-notification");
+  let doc = sitePermissionsDialog.document;
+
+  // Check if the enabled state is reflected in the checkbox.
+  let checkbox = doc.getElementById("permissionsDisableCheckbox");
+  Assert.equal(checkbox.checked, false);
+
+  // Disable permission and click on "Cancel".
+  checkbox.checked = true;
+  doc.querySelector("dialog").getButton("cancel").click();
+
+  // Check that the permission is not disabled yet.
+  let perm = Services.prefs.getIntPref(
+    "permissions.default.desktop-notification"
+  );
+  Assert.equal(perm, SitePermissions.UNKNOWN);
+
+  // Open the dialog once again.
+  await openPermissionsDialog("desktop-notification");
+  doc = sitePermissionsDialog.document;
+
+  // Disable permission and save changes.
+  checkbox = doc.getElementById("permissionsDisableCheckbox");
+  checkbox.checked = true;
+  doc.querySelector("dialog").getButton("accept").click();
+
+  // Check if the permission is now disabled.
+  perm = Services.prefs.getIntPref("permissions.default.desktop-notification");
+  Assert.equal(perm, SitePermissions.BLOCK);
+
+  // Open the dialog once again and check if the disabled state is still reflected in the checkbox.
+  await openPermissionsDialog("desktop-notification");
+  doc = sitePermissionsDialog.document;
+  checkbox = doc.getElementById("permissionsDisableCheckbox");
+  Assert.equal(checkbox.checked, true);
+
+  // Close the dialog and clean up.
+  doc.querySelector("dialog").getButton("cancel").click();
+  Services.prefs.setIntPref(
+    "permissions.default.desktop-notification",
+    SitePermissions.UNKNOWN
+  );
+});
+
+add_task(async function checkDefaultPermissionState() {
+  // Set default permission state to ALLOW.
+  Services.prefs.setIntPref(
+    "permissions.default.desktop-notification",
+    SitePermissions.ALLOW
+  );
+
+  await openPermissionsDialog("desktop-notification");
+  let doc = sitePermissionsDialog.document;
+
+  // Check if the enabled state is reflected in the checkbox.
+  let checkbox = doc.getElementById("permissionsDisableCheckbox");
+  Assert.equal(checkbox.checked, false);
+
+  // Check the checkbox and then uncheck it.
+  checkbox.checked = true;
+  checkbox.checked = false;
+
+  // Save changes.
+  doc.querySelector("dialog").getButton("accept").click();
+
+  // Check if the default permission state is retained (and not automatically set to SitePermissions.UNKNOWN).
+  let state = Services.prefs.getIntPref(
+    "permissions.default.desktop-notification"
+  );
+  Assert.equal(state, SitePermissions.ALLOW);
+
+  // Clean up.
+  Services.prefs.setIntPref(
+    "permissions.default.desktop-notification",
+    SitePermissions.UNKNOWN
+  );
+});
+
+add_task(async function testTabBehaviour() {
+  // Test tab behaviour inside the permissions setting dialog when site permissions are selected.
+  // Only selected items in the richlistbox should be tabable for accessibility reasons.
+
+  // Force tabfocus for all elements on OSX.
+  SpecialPowers.pushPrefEnv({ set: [["accessibility.tabfocus", 7]] });
+
+  PermissionTestUtils.add(
+    URI,
+    "desktop-notification",
+    Services.perms.ALLOW_ACTION
+  );
+  let u = Services.io.newURI("http://www.test.com");
+  PermissionTestUtils.add(
+    u,
+    "desktop-notification",
+    Services.perms.ALLOW_ACTION
+  );
+
+  await openPermissionsDialog("desktop-notification");
+  let doc = sitePermissionsDialog.document;
+
+  EventUtils.synthesizeKey("KEY_Tab", {}, sitePermissionsDialog);
+  let richlistbox = doc.getElementById("permissionsBox");
+  is(
+    richlistbox,
+    doc.activeElement.closest("#permissionsBox"),
+    "The richlistbox is focused after pressing tab once."
+  );
+
+  EventUtils.synthesizeKey("KEY_ArrowDown", {}, sitePermissionsDialog);
+  EventUtils.synthesizeKey("KEY_Tab", {}, sitePermissionsDialog);
+  let menulist = doc
+    .getElementById("permissionsBox")
+    .itemChildren[1].getElementsByTagName("menulist")[0];
+  is(
+    menulist,
+    doc.activeElement,
+    "The menulist inside the selected richlistitem is focused now"
+  );
+
+  EventUtils.synthesizeKey("KEY_Tab", {}, sitePermissionsDialog);
+  let removeButton = doc.getElementById("removePermission");
+  is(
+    removeButton,
+    doc.activeElement,
+    "The focus moves outside the richlistbox and onto the remove button"
+  );
+
+  PermissionTestUtils.remove(URI, "desktop-notification");
+  PermissionTestUtils.remove(u, "desktop-notification");
+
+  doc.querySelector("dialog").getButton("cancel").click();
+});
+
+add_task(async function addSpeakerPermission() {
+  let enabled = Services.prefs.getBoolPref("media.setsinkid.enabled", false);
+  let speakerRow =
+    gBrowser.contentDocument.getElementById("speakerSettingsRow");
+  Assert.equal(
+    BrowserTestUtils.isVisible(speakerRow),
+    enabled,
+    "speakerRow visible"
+  );
+  if (!enabled) {
+    return;
+  }
+
+  await openPermissionsDialog("speaker");
+  let doc = sitePermissionsDialog.document;
+  let richlistbox = doc.getElementById("permissionsBox");
+  Assert.equal(
+    richlistbox.itemCount,
+    0,
+    "Number of permission items is 0 initially"
+  );
+  // Add an allow permission for a device.
+  let deviceId = "DEVICE-ID";
+  let devicePermissionId = `speaker^${deviceId}`;
+  PermissionTestUtils.add(URI, devicePermissionId, Services.perms.ALLOW_ACTION);
+
+  // Observe the added permission changes in the dialog UI.
+  Assert.equal(richlistbox.itemCount, 1, "itemCount with allow");
+  checkMenulistPermissionItem(URL, Services.perms.ALLOW_ACTION);
+
+  // Check that an all-device deny permission overrides the device-specific
+  // allow permission.
+  PermissionTestUtils.add(URI, "speaker", Services.perms.DENY_ACTION);
+
+  Assert.equal(richlistbox.itemCount, 1, "itemCount with deny and allow");
+  let richlistitem = richlistbox.itemChildren[0];
+  let siteStatus = richlistitem.querySelector(".website-status");
+  Assert.equal(
+    siteStatus.value,
+    Services.perms.DENY_ACTION,
+    "website status with deny and allow"
+  );
+  // The website status element is not a menulist because all-device allow is
+  // not an option.
+  Assert.equal(siteStatus.tagName, "label");
+
+  PermissionTestUtils.remove(URI, devicePermissionId);
+  PermissionTestUtils.remove(URI, "speaker");
+
+  doc.querySelector("dialog").getButton("cancel").click();
+});
+
+add_task(async function removeTab() {
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_permissions_dialog_default_perm.js b/browser/components/preferences/tests/browser_permissions_dialog_default_perm.js
new file mode 100644
index 0000000000..37bde1a275
--- /dev/null
+++ b/browser/components/preferences/tests/browser_permissions_dialog_default_perm.js
@@ -0,0 +1,145 @@
+"use strict";
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const PERMISSIONS_URL =
+  "chrome://browser/content/preferences/dialogs/permissions.xhtml";
+
+let sitePermissionsDialog;
+
+let principal = Services.scriptSecurityManager.createContentPrincipal(
+  Services.io.newURI("http://www.example.com"),
+  {}
+);
+let pbPrincipal = Services.scriptSecurityManager.principalWithOA(principal, {
+  privateBrowsingId: 1,
+});
+let principalB = Services.scriptSecurityManager.createContentPrincipal(
+  Services.io.newURI("https://example.org"),
+  {}
+);
+
+/**
+ * Replaces the default permissions defined in browser/app/permissions with our
+ * own test-only permissions and instructs the permission manager to import
+ * them.
+ */
+async function addDefaultTestPermissions() {
+  // create a file in the temp directory with the defaults.
+  let file = Services.dirsvc.get("TmpD", Ci.nsIFile);
+  file.append("test_default_permissions");
+
+  await IOUtils.writeUTF8(
+    file.path,
+    `origin\tinstall\t1\t${principal.origin}\norigin\tinstall\t1\t${pbPrincipal.origin}\n`
+  );
+
+  // Change the default permission file path.
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["permissions.manager.defaultsUrl", Services.io.newFileURI(file).spec],
+    ],
+  });
+
+  // Call the permission manager to reload default permissions from file.
+  Services.obs.notifyObservers(null, "testonly-reload-permissions-from-disk");
+
+  registerCleanupFunction(async () => {
+    // Clean up temporary default permission file.
+    await IOUtils.remove(file.path);
+
+    // Restore non-test default permissions.
+    await SpecialPowers.popPrefEnv();
+    Services.obs.notifyObservers(null, "testonly-reload-permissions-from-disk");
+  });
+}
+
+async function openPermissionsDialog() {
+  let dialogOpened = promiseLoadSubDialog(PERMISSIONS_URL);
+
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], function () {
+    let doc = content.document;
+    let settingsButton = doc.getElementById("addonExceptions");
+    settingsButton.click();
+  });
+
+  sitePermissionsDialog = await dialogOpened;
+  await sitePermissionsDialog.document.mozSubdialogReady;
+}
+
+add_setup(async function () {
+  await addDefaultTestPermissions();
+});
+
+/**
+ * Tests that default (persistent) private browsing permissions can be removed.
+ */
+add_task(async function removeAll() {
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  await openPermissionsDialog();
+
+  let doc = sitePermissionsDialog.document;
+  let richlistbox = doc.getElementById("permissionsBox");
+
+  // First item in the richlistbox contains column headers.
+  Assert.equal(
+    richlistbox.itemCount,
+    2,
+    "Should have the two default permission entries initially."
+  );
+
+  info("Adding a new non-default install permission");
+  PermissionTestUtils.add(principalB, "install", Services.perms.ALLOW_ACTION);
+
+  info("Waiting for the permission to appear in the list.");
+  await BrowserTestUtils.waitForMutationCondition(
+    richlistbox,
+    { childList: true },
+    () => richlistbox.itemCount == 3
+  );
+
+  info("Clicking remove all.");
+  doc.getElementById("removeAllPermissions").click();
+
+  info("Waiting for all list items to be cleared.");
+  await BrowserTestUtils.waitForMutationCondition(
+    richlistbox,
+    { childList: true },
+    () => richlistbox.itemCount == 0
+  );
+
+  let dialogClosePromise = BrowserTestUtils.waitForEvent(
+    sitePermissionsDialog,
+    "dialogclosing",
+    true
+  );
+
+  info("Accepting dialog to apply the changes.");
+  doc.querySelector("dialog").getButton("accept").click();
+
+  info("Waiting for dialog to close.");
+  await dialogClosePromise;
+
+  info("Waiting for all permissions to be removed.");
+  await TestUtils.waitForCondition(
+    () =>
+      PermissionTestUtils.getPermissionObject(principal, "install") == null &&
+      PermissionTestUtils.getPermissionObject(pbPrincipal, "install") == null &&
+      PermissionTestUtils.getPermissionObject(principalB, "install") == null
+  );
+
+  info("Opening the permissions dialog again.");
+  await openPermissionsDialog();
+
+  Assert.equal(
+    richlistbox.itemCount,
+    0,
+    "Permission list should still be empty."
+  );
+
+  // Cleanup
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  Services.perms.removeAll();
+});
diff --git a/browser/components/preferences/tests/browser_permissions_urlFieldHidden.js b/browser/components/preferences/tests/browser_permissions_urlFieldHidden.js
new file mode 100644
index 0000000000..537ee3db72
--- /dev/null
+++ b/browser/components/preferences/tests/browser_permissions_urlFieldHidden.js
@@ -0,0 +1,38 @@
+"use strict";
+
+const PERMISSIONS_URL =
+  "chrome://browser/content/preferences/dialogs/permissions.xhtml";
+
+add_task(async function urlFieldVisibleForPopupPermissions(finish) {
+  await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+  let win = gBrowser.selectedBrowser.contentWindow;
+  let doc = win.document;
+  let popupPolicyCheckbox = doc.getElementById("popupPolicy");
+  ok(
+    !popupPolicyCheckbox.checked,
+    "popupPolicyCheckbox should be unchecked by default"
+  );
+  popupPolicyCheckbox.click();
+  let popupPolicyButton = doc.getElementById("popupPolicyButton");
+  ok(popupPolicyButton, "popupPolicyButton found");
+  let dialogPromise = promiseLoadSubDialog(PERMISSIONS_URL);
+  popupPolicyButton.click();
+  let dialog = await dialogPromise;
+  ok(dialog, "dialog loaded");
+
+  let urlLabel = dialog.document.getElementById("urlLabel");
+  ok(
+    !urlLabel.hidden,
+    "urlLabel should be visible when one of block/session/allow visible"
+  );
+  let url = dialog.document.getElementById("url");
+  ok(
+    !url.hidden,
+    "url should be visible when one of block/session/allow visible"
+  );
+
+  popupPolicyCheckbox.click();
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_primaryPassword.js b/browser/components/preferences/tests/browser_primaryPassword.js
new file mode 100644
index 0000000000..1162ca1290
--- /dev/null
+++ b/browser/components/preferences/tests/browser_primaryPassword.js
@@ -0,0 +1,130 @@
+const { OSKeyStoreTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/OSKeyStoreTestUtils.sys.mjs"
+);
+const { OSKeyStore } = ChromeUtils.importESModule(
+  "resource://gre/modules/OSKeyStore.sys.mjs"
+);
+
+add_task(async function () {
+  let prefs = await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "panePrivacy", "Privacy pane was selected");
+
+  let doc = gBrowser.contentDocument;
+  // Fake the subdialog and LoginHelper
+  let win = doc.defaultView;
+  let dialogURL = "";
+  let dialogOpened = false;
+  ChromeUtils.defineLazyGetter(win, "gSubDialog", () => ({
+    open(aDialogURL, { closingCallback: aCallback }) {
+      dialogOpened = true;
+      dialogURL = aDialogURL;
+      primaryPasswordSet = primaryPasswordNextState;
+      aCallback();
+    },
+  }));
+
+  let primaryPasswordSet = false;
+  win.LoginHelper = {
+    isPrimaryPasswordSet() {
+      return primaryPasswordSet;
+    },
+  };
+
+  let checkbox = doc.querySelector("#useMasterPassword");
+  checkbox.scrollIntoView();
+  ok(
+    !checkbox.checked,
+    "primary password checkbox should be unchecked by default"
+  );
+  let button = doc.getElementById("changeMasterPassword");
+  ok(button.disabled, "primary password button should be disabled by default");
+
+  let primaryPasswordNextState = false;
+  if (OSKeyStoreTestUtils.canTestOSKeyStoreLogin() && OSKeyStore.canReauth()) {
+    let osAuthDialogShown = OSKeyStoreTestUtils.waitForOSKeyStoreLogin(false);
+    checkbox.click();
+    info("waiting for os auth dialog to appear and get canceled");
+    await osAuthDialogShown;
+    await TestUtils.waitForCondition(
+      () => !checkbox.checked,
+      "wait for checkbox to get unchecked"
+    );
+    ok(!dialogOpened, "the dialog should not have opened");
+    ok(
+      !dialogURL,
+      "the changemp dialog should not have been opened when the os auth dialog is canceled"
+    );
+    ok(
+      !checkbox.checked,
+      "primary password checkbox should be unchecked after canceling os auth dialog"
+    );
+    ok(button.disabled, "button should be disabled after canceling os auth");
+  }
+
+  primaryPasswordNextState = true;
+  if (OSKeyStoreTestUtils.canTestOSKeyStoreLogin() && OSKeyStore.canReauth()) {
+    let osAuthDialogShown = OSKeyStoreTestUtils.waitForOSKeyStoreLogin(true);
+    checkbox.click();
+    info("waiting for os auth dialog to appear");
+    await osAuthDialogShown;
+    info("waiting for dialogURL to get set");
+    await TestUtils.waitForCondition(
+      () => dialogURL,
+      "wait for open to get called asynchronously"
+    );
+    is(
+      dialogURL,
+      "chrome://mozapps/content/preferences/changemp.xhtml",
+      "clicking on the checkbox should open the primary password dialog"
+    );
+  } else {
+    primaryPasswordSet = true;
+    doc.defaultView.gPrivacyPane._initMasterPasswordUI();
+    await TestUtils.waitForCondition(
+      () => !button.disabled,
+      "waiting for primary password button to get enabled"
+    );
+  }
+  ok(!button.disabled, "primary password button should now be enabled");
+  ok(checkbox.checked, "primary password checkbox should be checked now");
+
+  dialogURL = "";
+  button.doCommand();
+  await TestUtils.waitForCondition(
+    () => dialogURL,
+    "wait for open to get called asynchronously"
+  );
+  is(
+    dialogURL,
+    "chrome://mozapps/content/preferences/changemp.xhtml",
+    "clicking on the button should open the primary password dialog"
+  );
+  ok(!button.disabled, "primary password button should still be enabled");
+  ok(checkbox.checked, "primary password checkbox should be checked still");
+
+  // Confirm that we won't automatically respond to the dialog,
+  // since we don't expect a dialog here, we want the test to fail if one appears.
+  is(
+    Services.prefs.getStringPref(
+      "toolkit.osKeyStore.unofficialBuildOnlyLogin",
+      ""
+    ),
+    "",
+    "Pref should be set to an empty string"
+  );
+
+  primaryPasswordNextState = false;
+  dialogURL = "";
+  checkbox.click();
+  is(
+    dialogURL,
+    "chrome://mozapps/content/preferences/removemp.xhtml",
+    "clicking on the checkbox to uncheck primary password should show the removal dialog"
+  );
+  ok(button.disabled, "primary password button should now be disabled");
+  ok(!checkbox.checked, "primary password checkbox should now be unchecked");
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_privacy_cookieBannerHandling.js b/browser/components/preferences/tests/browser_privacy_cookieBannerHandling.js
new file mode 100644
index 0000000000..37ea14d430
--- /dev/null
+++ b/browser/components/preferences/tests/browser_privacy_cookieBannerHandling.js
@@ -0,0 +1,160 @@
+/* Any copyright is dedicated to the Public Domain.
+ * https://creativecommons.org/publicdomain/zero/1.0/ */
+
+// This file tests the Privacy pane's Cookie Banner Handling UI.
+
+"use strict";
+
+const FEATURE_PREF = "cookiebanners.ui.desktop.enabled";
+const MODE_PREF = "cookiebanners.service.mode";
+const PBM_MODE_PREF = "cookiebanners.service.mode.privateBrowsing";
+
+const GROUPBOX_ID = "cookieBannerHandlingGroup";
+const CHECKBOX_ID = "handleCookieBanners";
+
+// Test the section is hidden on page load if the feature pref is disabled.
+add_task(async function test_section_hidden_when_feature_flag_disabled() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [FEATURE_PREF, false],
+      [PBM_MODE_PREF, Ci.nsICookieBannerService.MODE_DISABLED],
+    ],
+  });
+
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "about:preferences#privacy" },
+    async function (browser) {
+      let groupbox = browser.contentDocument.getElementById(GROUPBOX_ID);
+      is_element_hidden(groupbox, "#cookieBannerHandlingGroup is hidden");
+    }
+  );
+
+  await SpecialPowers.popPrefEnv();
+});
+
+// Test the section is shown on page load if the feature pref is enabled.
+add_task(async function test_section_shown_when_feature_flag_enabled() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [FEATURE_PREF, true],
+      [PBM_MODE_PREF, Ci.nsICookieBannerService.MODE_DISABLED],
+    ],
+  });
+
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "about:preferences#privacy" },
+    async function (browser) {
+      let groupbox = browser.contentDocument.getElementById(GROUPBOX_ID);
+      is_element_visible(groupbox, "#cookieBannerHandlingGroup is visible");
+    }
+  );
+
+  await SpecialPowers.popPrefEnv();
+});
+
+// Test the checkbox is unchecked in DISABLED mode.
+add_task(async function test_checkbox_unchecked_disabled_mode() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [FEATURE_PREF, true],
+      [PBM_MODE_PREF, Ci.nsICookieBannerService.MODE_DISABLED],
+    ],
+  });
+
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "about:preferences#privacy" },
+    async function (browser) {
+      let checkbox = browser.contentDocument.getElementById(CHECKBOX_ID);
+      ok(!checkbox.checked, "checkbox is not checked in DISABLED mode");
+    }
+  );
+
+  await SpecialPowers.popPrefEnv();
+});
+
+// Test the checkbox is checked in REJECT mode.
+add_task(async function test_checkbox_checked_reject_mode() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [FEATURE_PREF, true],
+      [PBM_MODE_PREF, Ci.nsICookieBannerService.MODE_REJECT],
+    ],
+  });
+
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "about:preferences#privacy" },
+    async function (browser) {
+      let checkbox = browser.contentDocument.getElementById(CHECKBOX_ID);
+      ok(checkbox.checked, "checkbox is checked in REJECT mode");
+    }
+  );
+
+  await SpecialPowers.popPrefEnv();
+});
+
+// Test that toggling the checkbox toggles the mode pref value as expected
+add_task(async function test_checkbox_modifies_prefs() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [FEATURE_PREF, true],
+      [MODE_PREF, Ci.nsICookieBannerService.MODE_DISABLED],
+      [PBM_MODE_PREF, Ci.nsICookieBannerService.MODE_DISABLED],
+    ],
+  });
+
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "about:preferences#privacy" },
+    async function (browser) {
+      let checkboxSelector = "#" + CHECKBOX_ID;
+      let checkbox = browser.contentDocument.querySelector(checkboxSelector);
+      let section = browser.contentDocument.getElementById(GROUPBOX_ID);
+
+      section.scrollIntoView();
+
+      Assert.ok(
+        !checkbox.checked,
+        "initially, the checkbox should be unchecked"
+      );
+
+      await BrowserTestUtils.synthesizeMouseAtCenter(
+        checkboxSelector,
+        {},
+        browser
+      );
+      Assert.ok(checkbox.checked, "checkbox should be checked");
+
+      Assert.equal(
+        Ci.nsICookieBannerService.MODE_REJECT,
+        Services.prefs.getIntPref(PBM_MODE_PREF),
+        "cookie banner handling mode for PBM should be set to REJECT after checking the checkbox"
+      );
+
+      Assert.equal(
+        Ci.nsICookieBannerService.MODE_DISABLED,
+        Services.prefs.getIntPref(MODE_PREF),
+        "non-PBM cookie banner handling mode should be unchanged after checking the checkbox"
+      );
+
+      await BrowserTestUtils.synthesizeMouseAtCenter(
+        checkboxSelector,
+        {},
+        browser
+      );
+      Assert.ok(!checkbox.checked, "checkbox should be unchecked");
+      Assert.equal(
+        Ci.nsICookieBannerService.MODE_DISABLED,
+        Services.prefs.getIntPref(PBM_MODE_PREF),
+        "cookie banner handling mode for PBM should be set to DISABLED after unchecking the checkbox"
+      );
+
+      // this ensures the off-ramp for non-PBM pref is working
+      Assert.equal(
+        Ci.nsICookieBannerService.MODE_DISABLED,
+        Services.prefs.getIntPref(MODE_PREF),
+        "non-PBM cookie banner handling mode should be set to DISABLED after unchecking the checkbox"
+      );
+    }
+  );
+
+  await SpecialPowers.popPrefEnv();
+});
diff --git a/browser/components/preferences/tests/browser_privacy_dnsoverhttps.js b/browser/components/preferences/tests/browser_privacy_dnsoverhttps.js
new file mode 100644
index 0000000000..48469cfce4
--- /dev/null
+++ b/browser/components/preferences/tests/browser_privacy_dnsoverhttps.js
@@ -0,0 +1,844 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+requestLongerTimeout(4);
+
+const { EnterprisePolicyTesting, PoliciesPrefTracker } =
+  ChromeUtils.importESModule(
+    "resource://testing-common/EnterprisePolicyTesting.sys.mjs"
+  );
+
+ChromeUtils.defineESModuleGetters(this, {
+  DoHConfigController: "resource:///modules/DoHConfig.sys.mjs",
+  DoHController: "resource:///modules/DoHController.sys.mjs",
+  DoHTestUtils: "resource://testing-common/DoHTestUtils.sys.mjs",
+});
+
+const TRR_MODE_PREF = "network.trr.mode";
+const TRR_URI_PREF = "network.trr.uri";
+const TRR_CUSTOM_URI_PREF = "network.trr.custom_uri";
+const ROLLOUT_ENABLED_PREF = "doh-rollout.enabled";
+const ROLLOUT_SELF_ENABLED_PREF = "doh-rollout.self-enabled";
+const HEURISTICS_DISABLED_PREF = "doh-rollout.disable-heuristics";
+const FIRST_RESOLVER_VALUE = DoHTestUtils.providers[0].uri;
+const SECOND_RESOLVER_VALUE = DoHTestUtils.providers[1].uri;
+const DEFAULT_RESOLVER_VALUE = FIRST_RESOLVER_VALUE;
+
+const defaultPrefValues = Object.freeze({
+  [TRR_MODE_PREF]: 0,
+  [TRR_CUSTOM_URI_PREF]: "",
+});
+
+// See bug 1741554. This test should not actually try to create a connection to
+// the real DoH endpoint. But a background request could do that while the test
+// is in progress, before we've actually disabled TRR, and would cause a crash
+// due to connecting to a non-local IP.
+// To prevent that we override the IP to a local address.
+Cc["@mozilla.org/network/native-dns-override;1"]
+  .getService(Ci.nsINativeDNSResolverOverride)
+  .addIPOverride("mozilla.cloudflare-dns.com", "127.0.0.1");
+
+async function clearEvents() {
+  Services.telemetry.clearEvents();
+  await TestUtils.waitForCondition(() => {
+    let events = Services.telemetry.snapshotEvents(
+      Ci.nsITelemetry.DATASET_ALL_CHANNELS,
+      true
+    ).parent;
+    return !events || !events.length;
+  });
+}
+
+async function getEvent(filter1, filter2) {
+  let event = await TestUtils.waitForCondition(() => {
+    let events = Services.telemetry.snapshotEvents(
+      Ci.nsITelemetry.DATASET_ALL_CHANNELS,
+      true
+    ).parent;
+    return events?.find(e => e[1] == filter1 && e[2] == filter2);
+  }, "recorded telemetry for the load");
+  event.shift();
+  return event;
+}
+
+async function resetPrefs() {
+  await DoHTestUtils.resetRemoteSettingsConfig();
+  await DoHController._uninit();
+  Services.prefs.clearUserPref(TRR_MODE_PREF);
+  Services.prefs.clearUserPref(TRR_URI_PREF);
+  Services.prefs.clearUserPref(TRR_CUSTOM_URI_PREF);
+  Services.prefs.getChildList("doh-rollout.").forEach(pref => {
+    Services.prefs.clearUserPref(pref);
+  });
+  // Clear out any telemetry events generated by DoHController so that we don't
+  // confuse tests running after this one that are looking at those.
+  Services.telemetry.clearEvents();
+  await DoHController.init();
+}
+Services.prefs.setStringPref("network.trr.confirmationNS", "skip");
+
+registerCleanupFunction(async () => {
+  await resetPrefs();
+  Services.prefs.clearUserPref("network.trr.confirmationNS");
+});
+
+add_setup(async function setup() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["toolkit.telemetry.testing.overrideProductsCheck", true]],
+  });
+
+  await DoHTestUtils.resetRemoteSettingsConfig();
+});
+
+function waitForPrefObserver(name) {
+  return new Promise(resolve => {
+    const observer = {
+      observe(aSubject, aTopic, aData) {
+        if (aData == name) {
+          Services.prefs.removeObserver(name, observer);
+          resolve();
+        }
+      },
+    };
+    Services.prefs.addObserver(name, observer);
+  });
+}
+
+async function testWithProperties(props, startTime) {
+  info(
+    Date.now() -
+      startTime +
+      ": testWithProperties: testing with " +
+      JSON.stringify(props)
+  );
+
+  // There are two different signals that the DoHController is ready, depending
+  // on the config being tested. If we're setting the TRR mode pref, we should
+  // expect the disable-heuristics pref to be set as the signal. Else, we can
+  // expect the self-enabled pref as the signal.
+  let rolloutReadyPromise;
+  if (props.hasOwnProperty(TRR_MODE_PREF)) {
+    if (
+      [2, 3, 5].includes(props[TRR_MODE_PREF]) &&
+      props.hasOwnProperty(ROLLOUT_ENABLED_PREF)
+    ) {
+      // Only initialize the promise if we're going to enable the rollout -
+      // otherwise we will never await it, which could cause a leak if it doesn't
+      // end up resolving.
+      rolloutReadyPromise = waitForPrefObserver(HEURISTICS_DISABLED_PREF);
+    }
+    Services.prefs.setIntPref(TRR_MODE_PREF, props[TRR_MODE_PREF]);
+  }
+  if (props.hasOwnProperty(ROLLOUT_ENABLED_PREF)) {
+    if (!rolloutReadyPromise) {
+      rolloutReadyPromise = waitForPrefObserver(ROLLOUT_SELF_ENABLED_PREF);
+    }
+    Services.prefs.setBoolPref(
+      ROLLOUT_ENABLED_PREF,
+      props[ROLLOUT_ENABLED_PREF]
+    );
+    await rolloutReadyPromise;
+  }
+  if (props.hasOwnProperty(TRR_CUSTOM_URI_PREF)) {
+    Services.prefs.setStringPref(
+      TRR_CUSTOM_URI_PREF,
+      props[TRR_CUSTOM_URI_PREF]
+    );
+  }
+  if (props.hasOwnProperty(TRR_URI_PREF)) {
+    Services.prefs.setStringPref(TRR_URI_PREF, props[TRR_URI_PREF]);
+  }
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  let doc = gBrowser.selectedBrowser.contentDocument;
+
+  info(Date.now() - startTime + ": testWithProperties: tab now open");
+  let modeRadioGroup = doc.getElementById("dohCategoryRadioGroup");
+  let uriTextbox = doc.getElementById("dohEnabledInputField");
+  let resolverMenulist = doc.getElementById("dohStrictResolverChoices");
+  let modePrefChangedPromise;
+  let uriPrefChangedPromise;
+  let disableHeuristicsPrefChangedPromise;
+
+  modeRadioGroup.scrollIntoView();
+
+  if (props.hasOwnProperty("expectedSelectedIndex")) {
+    await TestUtils.waitForCondition(
+      () => modeRadioGroup.selectedIndex === props.expectedSelectedIndex
+    );
+    is(
+      modeRadioGroup.selectedIndex,
+      props.expectedSelectedIndex,
+      "dohCategoryRadioGroup has expected selected index"
+    );
+  }
+  if (props.hasOwnProperty("expectedUriValue")) {
+    await TestUtils.waitForCondition(
+      () => uriTextbox.value === props.expectedUriValue
+    );
+    is(
+      uriTextbox.value,
+      props.expectedUriValue,
+      "URI textbox has expected value"
+    );
+  }
+  if (props.hasOwnProperty("expectedResolverListValue")) {
+    await TestUtils.waitForCondition(
+      () => resolverMenulist.value === props.expectedResolverListValue
+    );
+    is(
+      resolverMenulist.value,
+      props.expectedResolverListValue,
+      "resolver menulist has expected value"
+    );
+  }
+
+  if (props.clickMode) {
+    await clearEvents();
+    info(
+      Date.now() -
+        startTime +
+        ": testWithProperties: clickMode, waiting for the pref observer"
+    );
+    modePrefChangedPromise = waitForPrefObserver(TRR_MODE_PREF);
+    if (props.hasOwnProperty("expectedDisabledHeuristics")) {
+      disableHeuristicsPrefChangedPromise = waitForPrefObserver(
+        HEURISTICS_DISABLED_PREF
+      );
+    }
+    info(
+      Date.now() - startTime + ": testWithProperties: clickMode, pref changed"
+    );
+    let option = doc.getElementById(props.clickMode);
+    option.scrollIntoView();
+    let win = doc.ownerGlobal;
+    EventUtils.synthesizeMouseAtCenter(option, {}, win);
+    info(
+      `${Date.now() - startTime} : testWithProperties: clickMode=${
+        props.clickMode
+      }, mouse click synthesized`
+    );
+    let clickEvent = await getEvent("security.doh.settings", "mode_changed");
+    Assert.deepEqual(clickEvent, [
+      "security.doh.settings",
+      "mode_changed",
+      "button",
+      props.clickMode,
+    ]);
+  }
+  if (props.hasOwnProperty("selectResolver")) {
+    await clearEvents();
+    info(
+      Date.now() -
+        startTime +
+        ": testWithProperties: selectResolver, creating change event"
+    );
+    resolverMenulist.focus();
+    resolverMenulist.value = props.selectResolver;
+    resolverMenulist.dispatchEvent(new Event("input", { bubbles: true }));
+    resolverMenulist.dispatchEvent(new Event("command", { bubbles: true }));
+    info(
+      Date.now() -
+        startTime +
+        ": testWithProperties: selectResolver, item value set and events dispatched"
+    );
+    let choiceEvent = await getEvent(
+      "security.doh.settings",
+      "provider_choice"
+    );
+    Assert.deepEqual(choiceEvent, [
+      "security.doh.settings",
+      "provider_choice",
+      "value",
+      props.selectResolver,
+    ]);
+  }
+  if (props.hasOwnProperty("inputUriKeys")) {
+    info(
+      Date.now() -
+        startTime +
+        ": testWithProperties: inputUriKeys, waiting for the pref observer"
+    );
+    uriPrefChangedPromise = waitForPrefObserver(TRR_CUSTOM_URI_PREF);
+    info(
+      Date.now() -
+        startTime +
+        ": testWithProperties: inputUriKeys, pref changed, now enter the new value"
+    );
+    let win = doc.ownerGlobal;
+    uriTextbox.focus();
+    uriTextbox.value = props.inputUriKeys;
+    uriTextbox.dispatchEvent(new win.Event("input", { bubbles: true }));
+    uriTextbox.dispatchEvent(new win.Event("change", { bubbles: true }));
+    info(
+      Date.now() -
+        startTime +
+        ": testWithProperties: inputUriKeys, input and change events dispatched"
+    );
+  }
+
+  info(
+    Date.now() -
+      startTime +
+      ": testWithProperties: waiting for any of uri and mode prefs to change"
+  );
+  await Promise.all([
+    uriPrefChangedPromise,
+    modePrefChangedPromise,
+    disableHeuristicsPrefChangedPromise,
+  ]);
+  info(Date.now() - startTime + ": testWithProperties: prefs changed");
+
+  if (props.hasOwnProperty("expectedFinalUriPref")) {
+    if (props.expectedFinalUriPref) {
+      let uriPref = Services.prefs.getStringPref(TRR_URI_PREF);
+      is(
+        uriPref,
+        props.expectedFinalUriPref,
+        "uri pref ended up with the expected value"
+      );
+    } else {
+      ok(
+        !Services.prefs.prefHasUserValue(TRR_URI_PREF),
+        `uri pref ended up with the expected value (unset) got ${Services.prefs.getStringPref(
+          TRR_URI_PREF
+        )}`
+      );
+    }
+  }
+
+  if (props.hasOwnProperty("expectedModePref")) {
+    let modePref = Services.prefs.getIntPref(TRR_MODE_PREF);
+    is(
+      modePref,
+      props.expectedModePref,
+      "mode pref ended up with the expected value"
+    );
+  }
+
+  if (props.hasOwnProperty("expectedDisabledHeuristics")) {
+    let disabledHeuristicsPref = Services.prefs.getBoolPref(
+      HEURISTICS_DISABLED_PREF
+    );
+    is(
+      disabledHeuristicsPref,
+      props.expectedDisabledHeuristics,
+      "disable-heuristics pref ended up with the expected value"
+    );
+  }
+
+  if (props.hasOwnProperty("expectedFinalCustomUriPref")) {
+    let customUriPref = Services.prefs.getStringPref(TRR_CUSTOM_URI_PREF);
+    is(
+      customUriPref,
+      props.expectedFinalCustomUriPref,
+      "custom_uri pref ended up with the expected value"
+    );
+  }
+
+  if (props.hasOwnProperty("expectedModeValue")) {
+    let modeValue = Services.prefs.getIntPref(TRR_MODE_PREF);
+    is(modeValue, props.expectedModeValue, "mode pref has expected value");
+  }
+
+  gBrowser.removeCurrentTab();
+  info(Date.now() - startTime + ": testWithProperties: fin");
+}
+
+add_task(async function default_values() {
+  let customUriPref = Services.prefs.getStringPref(TRR_CUSTOM_URI_PREF);
+  let uriPrefHasUserValue = Services.prefs.prefHasUserValue(TRR_URI_PREF);
+  let modePref = Services.prefs.getIntPref(TRR_MODE_PREF);
+  is(
+    modePref,
+    defaultPrefValues[TRR_MODE_PREF],
+    `Actual value of ${TRR_MODE_PREF} matches expected default value`
+  );
+  ok(
+    !uriPrefHasUserValue,
+    `Actual value of ${TRR_URI_PREF} matches expected default value (unset)`
+  );
+  is(
+    customUriPref,
+    defaultPrefValues[TRR_CUSTOM_URI_PREF],
+    `Actual value of ${TRR_CUSTOM_URI_PREF} matches expected default value`
+  );
+});
+
+const DEFAULT_OPTION_INDEX = 0;
+const ENABLED_OPTION_INDEX = 1;
+const STRICT_OPTION_INDEX = 2;
+const OFF_OPTION_INDEX = 3;
+
+let testVariations = [
+  // verify state with defaults
+  {
+    name: "default",
+    expectedModePref: 0,
+    expectedSelectedIndex: DEFAULT_OPTION_INDEX,
+    expectedUriValue: "",
+  },
+
+  // verify each of the modes maps to the correct checked state
+  {
+    name: "mode 0",
+    [TRR_MODE_PREF]: 0,
+    expectedSelectedIndex: DEFAULT_OPTION_INDEX,
+  },
+  {
+    name: "mode 1",
+    [TRR_MODE_PREF]: 1,
+    expectedSelectedIndex: OFF_OPTION_INDEX,
+  },
+  {
+    name: "mode 2",
+    [TRR_MODE_PREF]: 2,
+    expectedSelectedIndex: ENABLED_OPTION_INDEX,
+    expectedFinalUriPref: "",
+  },
+  {
+    name: "mode 3",
+    [TRR_MODE_PREF]: 3,
+    expectedSelectedIndex: STRICT_OPTION_INDEX,
+    expectedFinalUriPref: "",
+  },
+  {
+    name: "mode 4",
+    [TRR_MODE_PREF]: 4,
+    expectedSelectedIndex: OFF_OPTION_INDEX,
+  },
+  {
+    name: "mode 5",
+    [TRR_MODE_PREF]: 5,
+    expectedSelectedIndex: OFF_OPTION_INDEX,
+  },
+  // verify an out of bounds mode value maps to the correct checked state
+  {
+    name: "mode out-of-bounds",
+    [TRR_MODE_PREF]: 77,
+    expectedSelectedIndex: OFF_OPTION_INDEX,
+  },
+
+  // verify automatic heuristics states
+  {
+    name: "heuristics on and mode unset",
+    [TRR_MODE_PREF]: 0,
+    [ROLLOUT_ENABLED_PREF]: true,
+    expectedSelectedIndex: DEFAULT_OPTION_INDEX,
+  },
+  {
+    name: "heuristics on and mode set to 2",
+    [TRR_MODE_PREF]: 2,
+    [ROLLOUT_ENABLED_PREF]: true,
+    expectedSelectedIndex: ENABLED_OPTION_INDEX,
+  },
+  {
+    name: "heuristics on but disabled, mode unset",
+    [TRR_MODE_PREF]: 5,
+    [ROLLOUT_ENABLED_PREF]: true,
+    expectedSelectedIndex: OFF_OPTION_INDEX,
+  },
+  {
+    name: "heuristics on but disabled, mode set to 2",
+    [TRR_MODE_PREF]: 2,
+    [ROLLOUT_ENABLED_PREF]: true,
+    expectedSelectedIndex: ENABLED_OPTION_INDEX,
+  },
+
+  // verify picking each radio button option gives the right outcomes
+  {
+    name: "toggle mode on",
+    clickMode: "dohEnabledRadio",
+    expectedModeValue: 2,
+    expectedUriValue: "",
+    expectedFinalUriPref: "",
+  },
+  {
+    name: "toggle mode off",
+    [TRR_MODE_PREF]: 2,
+    expectedSelectedIndex: ENABLED_OPTION_INDEX,
+    clickMode: "dohOffRadio",
+    expectedModePref: 5,
+  },
+  {
+    name: "toggle mode off when on due to heuristics",
+    [TRR_MODE_PREF]: 0,
+    [ROLLOUT_ENABLED_PREF]: true,
+    expectedSelectedIndex: DEFAULT_OPTION_INDEX,
+    clickMode: "dohOffRadio",
+    expectedModePref: 5,
+    expectedDisabledHeuristics: true,
+  },
+  // Test selecting non-default, non-custom TRR provider, NextDNS.
+  {
+    name: "Select NextDNS as TRR provider",
+    [TRR_MODE_PREF]: 2,
+    selectResolver: SECOND_RESOLVER_VALUE,
+    expectedFinalUriPref: SECOND_RESOLVER_VALUE,
+  },
+  // Test selecting non-default, non-custom TRR provider, NextDNS,
+  // with DoH not enabled. The provider selection should stick.
+  {
+    name: "Select NextDNS as TRR provider in mode 0",
+    [TRR_MODE_PREF]: 0,
+    selectResolver: SECOND_RESOLVER_VALUE,
+    expectedFinalUriPref: SECOND_RESOLVER_VALUE,
+  },
+  {
+    name: "return to default from NextDNS",
+    [TRR_MODE_PREF]: 2,
+    [TRR_URI_PREF]: SECOND_RESOLVER_VALUE,
+    expectedResolverListValue: SECOND_RESOLVER_VALUE,
+    selectResolver: DEFAULT_RESOLVER_VALUE,
+    expectedFinalUriPref: FIRST_RESOLVER_VALUE,
+  },
+  // test that selecting Custom, when we have a TRR_CUSTOM_URI_PREF subsequently changes TRR_URI_PREF
+  {
+    name: "select custom with existing custom_uri pref value",
+    [TRR_MODE_PREF]: 2,
+    [TRR_CUSTOM_URI_PREF]: "https://example.com",
+    expectedModeValue: 2,
+    expectedSelectedIndex: ENABLED_OPTION_INDEX,
+    selectResolver: "custom",
+    expectedUriValue: "https://example.com",
+    expectedFinalUriPref: "https://example.com",
+    expectedFinalCustomUriPref: "https://example.com",
+  },
+  {
+    name: "select custom and enter new custom_uri pref value",
+    [TRR_URI_PREF]: "",
+    [TRR_CUSTOM_URI_PREF]: "",
+    clickMode: "dohEnabledRadio",
+    selectResolver: "custom",
+    inputUriKeys: "https://custom.com",
+    expectedModePref: 2,
+    expectedFinalUriPref: "https://custom.com",
+    expectedFinalCustomUriPref: "https://custom.com",
+  },
+
+  {
+    name: "return to default from custom",
+    [TRR_MODE_PREF]: 2,
+    [TRR_URI_PREF]: "https://example.com",
+    [TRR_CUSTOM_URI_PREF]: "https://custom.com",
+    expectedUriValue: "https://example.com",
+    expectedResolverListValue: "custom",
+    selectResolver: DEFAULT_RESOLVER_VALUE,
+    expectedFinalUriPref: DEFAULT_RESOLVER_VALUE,
+    expectedFinalCustomUriPref: "https://example.com",
+  },
+  {
+    name: "clear the custom uri",
+    [TRR_MODE_PREF]: 2,
+    [TRR_URI_PREF]: "https://example.com",
+    [TRR_CUSTOM_URI_PREF]: "https://example.com",
+    expectedUriValue: "https://example.com",
+    expectedResolverListValue: "custom",
+    inputUriKeys: "",
+    expectedFinalUriPref: " ",
+    expectedFinalCustomUriPref: "",
+  },
+  {
+    name: "empty default resolver list",
+    [TRR_MODE_PREF]: 2,
+    [TRR_URI_PREF]: "https://example.com",
+    [TRR_CUSTOM_URI_PREF]: "",
+    expectedUriValue: "https://example.com",
+    expectedResolverListValue: "custom",
+    expectedFinalUriPref: "https://example.com",
+    expectedFinalCustomUriPref: "https://example.com",
+  },
+];
+
+for (let props of testVariations) {
+  add_task(async function testVariation() {
+    let startTime = Date.now();
+    info("starting test: " + props.name);
+    await testWithProperties(props, startTime);
+    await resetPrefs();
+  });
+}
+
+add_task(async function testRemoteSettingsEnable() {
+  let startTime = Date.now();
+  // Enable the rollout.
+  await DoHTestUtils.loadRemoteSettingsConfig({
+    providers: "example-1, example-2",
+    rolloutEnabled: true,
+    steeringEnabled: false,
+    steeringProviders: "",
+    autoDefaultEnabled: false,
+    autoDefaultProviders: "",
+    id: "global",
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  let doc = gBrowser.selectedBrowser.contentDocument;
+
+  info(Date.now() - startTime + ": testWithProperties: tab now open");
+  let modeRadioGroup = doc.getElementById("dohCategoryRadioGroup");
+
+  is(modeRadioGroup.value, "0", "expecting default mode");
+
+  let status = doc.getElementById("dohStatus");
+  await TestUtils.waitForCondition(
+    () => document.l10n.getAttributes(status).args.status == "Active"
+  );
+  is(
+    document.l10n.getAttributes(status).args.status,
+    "Active",
+    "expecting status active"
+  );
+
+  let provider = doc.getElementById("dohResolver");
+  is(
+    provider.hidden,
+    false,
+    "Provider should not be hidden when status is active"
+  );
+  await TestUtils.waitForCondition(
+    () =>
+      document.l10n.getAttributes(provider).args.name ==
+      DoHConfigController.currentConfig.providerList[0].UIName
+  );
+  is(
+    document.l10n.getAttributes(provider).args.name,
+    DoHConfigController.currentConfig.providerList[0].UIName,
+    "expecting the right provider name"
+  );
+
+  let option = doc.getElementById("dohEnabledRadio");
+  option.scrollIntoView();
+  let win = doc.ownerGlobal;
+  EventUtils.synthesizeMouseAtCenter(option, {}, win);
+
+  await TestUtils.waitForCondition(() =>
+    Services.prefs.prefHasUserValue("doh-rollout.disable-heuristics")
+  );
+  is(provider.hidden, false);
+  await TestUtils.waitForCondition(
+    () =>
+      document.l10n.getAttributes(provider).args.name ==
+      DoHConfigController.currentConfig.providerList[0].UIName
+  );
+  is(
+    document.l10n.getAttributes(provider).args.name,
+    DoHConfigController.currentConfig.providerList[0].UIName,
+    "expecting the right provider name"
+  );
+  is(
+    Services.prefs.getIntPref("network.trr.mode"),
+    Ci.nsIDNSService.MODE_TRRFIRST
+  );
+
+  option = doc.getElementById("dohOffRadio");
+  option.scrollIntoView();
+  win = doc.ownerGlobal;
+  EventUtils.synthesizeMouseAtCenter(option, {}, win);
+  await TestUtils.waitForCondition(() => status.innerHTML == "Status: Off");
+  is(
+    Services.prefs.getIntPref("network.trr.mode"),
+    Ci.nsIDNSService.MODE_TRROFF
+  );
+  is(provider.hidden, true, "Expecting provider to be hidden when DoH is off");
+
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function testEnterprisePolicy() {
+  async function withPolicy(policy, fn, preFn = () => {}) {
+    await resetPrefs();
+    PoliciesPrefTracker.start();
+    await EnterprisePolicyTesting.setupPolicyEngineWithJson(policy);
+    await preFn();
+
+    await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+    let doc = gBrowser.selectedBrowser.contentDocument;
+
+    let modeRadioGroup = doc.getElementById("dohCategoryRadioGroup");
+    let resolverMenulist = doc.getElementById("dohEnabledResolverChoices");
+    let uriTextbox = doc.getElementById("dohEnabledInputField");
+
+    await fn({
+      modeRadioGroup,
+      resolverMenulist,
+      doc,
+      uriTextbox,
+    });
+
+    gBrowser.removeCurrentTab();
+    EnterprisePolicyTesting.resetRunOnceState();
+    PoliciesPrefTracker.stop();
+  }
+
+  info("Check that a locked policy does not allow any changes in the UI");
+  await withPolicy(
+    {
+      policies: {
+        DNSOverHTTPS: {
+          Enabled: true,
+          ProviderURL: "https://examplelocked.com/provider",
+          ExcludedDomains: ["examplelocked.com", "example.org"],
+          Locked: true,
+        },
+      },
+    },
+    async res => {
+      is(res.modeRadioGroup.disabled, true, "The mode menu should be locked.");
+      is(res.modeRadioGroup.value, "2", "Should be enabled");
+      is(res.resolverMenulist.value, "custom", "Resolver list shows custom");
+      is(
+        res.uriTextbox.value,
+        "https://examplelocked.com/provider",
+        "Custom URI should be set"
+      );
+    }
+  );
+
+  info("Check that an unlocked policy has editable fields in the dialog");
+  await withPolicy(
+    {
+      policies: {
+        DNSOverHTTPS: {
+          Enabled: true,
+          ProviderURL: "https://example.com/provider",
+          ExcludedDomains: ["example.com", "example.org"],
+        },
+      },
+    },
+    async res => {
+      is(
+        res.modeRadioGroup.disabled,
+        false,
+        "The mode menu should not be locked."
+      );
+      is(res.modeRadioGroup.value, "2", "Should be enabled");
+      is(res.resolverMenulist.value, "custom", "Resolver list shows custom");
+      is(
+        res.uriTextbox.value,
+        "https://example.com/provider",
+        "Expected custom resolver"
+      );
+    }
+  );
+
+  info("Check that a locked disabled policy disables the buttons");
+  await withPolicy(
+    {
+      policies: {
+        DNSOverHTTPS: {
+          Enabled: false,
+          ProviderURL: "https://example.com/provider",
+          ExcludedDomains: ["example.com", "example.org"],
+          Locked: true,
+        },
+      },
+    },
+    async res => {
+      is(res.modeRadioGroup.disabled, true, "The mode menu should be locked.");
+      is(res.modeRadioGroup.value, "5", "Should be disabled");
+    }
+  );
+
+  info("Check that an unlocked disabled policy has editable fields");
+  await withPolicy(
+    {
+      policies: {
+        DNSOverHTTPS: {
+          Enabled: false,
+          ProviderURL: "https://example.com/provider",
+          ExcludedDomains: ["example.com", "example.org"],
+        },
+      },
+    },
+    async res => {
+      is(
+        res.modeRadioGroup.disabled,
+        false,
+        "The mode menu should not be locked."
+      );
+      is(res.modeRadioGroup.value, "5", "Should be disabled");
+    }
+  );
+
+  info("Check that the remote settings config doesn't override the policy");
+  await withPolicy(
+    {
+      policies: {
+        DNSOverHTTPS: {
+          Enabled: true,
+          ProviderURL: "https://example.com/provider",
+          ExcludedDomains: ["example.com", "example.org"],
+        },
+      },
+    },
+    async res => {
+      is(
+        res.modeRadioGroup.disabled,
+        false,
+        "The mode menu should not be locked."
+      );
+      is(res.resolverMenulist.value, "custom", "Resolver list shows custom");
+      is(
+        res.uriTextbox.value,
+        "https://example.com/provider",
+        "Expected custom resolver"
+      );
+    },
+    async function runAfterSettingPolicy() {
+      await DoHTestUtils.loadRemoteSettingsConfig({
+        providers: "example-1, example-2",
+        rolloutEnabled: true,
+        steeringEnabled: false,
+        steeringProviders: "",
+        autoDefaultEnabled: false,
+        autoDefaultProviders: "",
+        id: "global",
+      });
+    }
+  );
+});
+
+add_task(async function clickWarnButton() {
+  Services.prefs.setBoolPref(
+    "network.trr_ui.show_fallback_warning_option",
+    true
+  );
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  let doc = gBrowser.selectedBrowser.contentDocument;
+
+  await clearEvents();
+  let checkbox = doc.getElementById("dohWarnCheckbox1");
+  checkbox.click();
+
+  let event = await getEvent("security.doh.settings", "warn_checkbox");
+  Assert.deepEqual(event, [
+    "security.doh.settings",
+    "warn_checkbox",
+    "checkbox",
+    "true",
+  ]);
+  Assert.equal(
+    Services.prefs.getBoolPref("network.trr.display_fallback_warning"),
+    true,
+    "Clicking the checkbox should change the pref"
+  );
+
+  checkbox.click();
+  event = await getEvent("security.doh.settings", "warn_checkbox");
+  Assert.deepEqual(event, [
+    "security.doh.settings",
+    "warn_checkbox",
+    "checkbox",
+    "false",
+  ]);
+  Assert.equal(
+    Services.prefs.getBoolPref("network.trr.display_fallback_warning"),
+    false,
+    "Clicking the checkbox should change the pref"
+  );
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_privacy_firefoxSuggest.js b/browser/components/preferences/tests/browser_privacy_firefoxSuggest.js
new file mode 100644
index 0000000000..c5fc24206b
--- /dev/null
+++ b/browser/components/preferences/tests/browser_privacy_firefoxSuggest.js
@@ -0,0 +1,140 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// This tests the Privacy pane's Firefox Suggest UI.
+
+"use strict";
+
+ChromeUtils.defineESModuleGetters(this, {
+  QuickSuggest: "resource:///modules/QuickSuggest.sys.mjs",
+});
+
+const CONTAINER_ID = "dataCollectionGroup";
+const DATA_COLLECTION_TOGGLE_ID = "firefoxSuggestDataCollectionPrivacyToggle";
+const LEARN_MORE_CLASS = "firefoxSuggestLearnMore";
+
+// This test can take a while due to the many permutations some of these tasks
+// run through, so request a longer timeout.
+requestLongerTimeout(10);
+
+// Clicks each of the checkboxes and toggles and makes sure the prefs and info box are updated.
+add_task(async function clickCheckboxesOrToggle() {
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let dataCollectionSection = doc.getElementById(CONTAINER_ID);
+  dataCollectionSection.scrollIntoView();
+
+  async function clickElement(id, eventName) {
+    let element = doc.getElementById(id);
+    let changed = BrowserTestUtils.waitForEvent(element, eventName);
+
+    if (eventName == "toggle") {
+      element = element.buttonEl;
+    }
+
+    EventUtils.synthesizeMouseAtCenter(
+      element,
+      {},
+      gBrowser.selectedBrowser.contentWindow
+    );
+    await changed;
+  }
+
+  // Set initial state.
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.urlbar.quicksuggest.dataCollection.enabled", true]],
+  });
+  assertPrefUIState({
+    [DATA_COLLECTION_TOGGLE_ID]: true,
+  });
+
+  // data collection toggle
+  await clickElement(DATA_COLLECTION_TOGGLE_ID, "toggle");
+  Assert.ok(
+    !Services.prefs.getBoolPref(
+      "browser.urlbar.quicksuggest.dataCollection.enabled"
+    ),
+    "quicksuggest.dataCollection.enabled is false after clicking data collection toggle"
+  );
+  assertPrefUIState({
+    [DATA_COLLECTION_TOGGLE_ID]: false,
+  });
+
+  gBrowser.removeCurrentTab();
+  await SpecialPowers.popPrefEnv();
+});
+
+// Clicks the learn-more links and checks the help page is opened in a new tab.
+add_task(async function clickLearnMore() {
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let dataCollectionSection = doc.getElementById(CONTAINER_ID);
+  dataCollectionSection.scrollIntoView();
+
+  // Set initial state so that the info box and learn more link are shown.
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.urlbar.quicksuggest.dataCollection.enabled", true]],
+  });
+
+  let learnMoreLinks = doc.querySelectorAll(
+    `#${CONTAINER_ID} .` + LEARN_MORE_CLASS
+  );
+  Assert.equal(
+    learnMoreLinks.length,
+    1,
+    "Expected number of learn-more links are present"
+  );
+  for (let link of learnMoreLinks) {
+    Assert.ok(
+      BrowserTestUtils.isVisible(link),
+      "Learn-more link is visible: " + link.id
+    );
+  }
+
+  let prefsTab = gBrowser.selectedTab;
+  for (let link of learnMoreLinks) {
+    let tabPromise = BrowserTestUtils.waitForNewTab(
+      gBrowser,
+      QuickSuggest.HELP_URL
+    );
+    info("Clicking learn-more link: " + link.id);
+    Assert.ok(link.id, "Sanity check: Learn-more link has an ID");
+    await BrowserTestUtils.synthesizeMouseAtCenter(
+      "#" + link.id,
+      {},
+      gBrowser.selectedBrowser
+    );
+    info("Waiting for help page to load in a new tab");
+    await tabPromise;
+    gBrowser.removeCurrentTab();
+    gBrowser.selectedTab = prefsTab;
+  }
+
+  gBrowser.removeCurrentTab();
+  await SpecialPowers.popPrefEnv();
+});
+
+/**
+ * Verifies the state of pref related to checkboxes or toggles.
+ *
+ * @param {object} stateByElementID
+ *   Maps checkbox or toggle element IDs to booleans. Each boolean
+ *   is the expected state of the corresponding ID.
+ */
+function assertPrefUIState(stateByElementID) {
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let container = doc.getElementById(CONTAINER_ID);
+  let attr;
+  Assert.ok(BrowserTestUtils.isVisible(container), "The container is visible");
+  for (let [id, state] of Object.entries(stateByElementID)) {
+    let element = doc.getElementById(id);
+    if (element.tagName === "checkbox") {
+      attr = "checked";
+    } else if (element.tagName === "html:moz-toggle") {
+      attr = "pressed";
+    }
+    Assert.equal(element[attr], state, "Expected state for ID: " + id);
+  }
+}
diff --git a/browser/components/preferences/tests/browser_privacy_gpc.js b/browser/components/preferences/tests/browser_privacy_gpc.js
new file mode 100644
index 0000000000..0bdd9d6dae
--- /dev/null
+++ b/browser/components/preferences/tests/browser_privacy_gpc.js
@@ -0,0 +1,182 @@
+/* Any copyright is dedicated to the Public Domain.
+ * https://creativecommons.org/publicdomain/zero/1.0/ */
+
+// This file tests the Privacy pane's Cookie Banner Handling UI.
+
+"use strict";
+
+const FEATURE_PREF = "privacy.globalprivacycontrol.functionality.enabled";
+const MODE_PREF = "privacy.globalprivacycontrol.enabled";
+const DNT_PREF = "privacy.donottrackheader.enabled";
+
+const SECTION_ID = "nonTechnicalPrivacyBox";
+const GPC_ID = "globalPrivacyControlBox";
+const GPC_CHECKBOX_ID = "globalPrivacyControlCheckbox";
+const OLD_DNT_ID = "legacyDoNotTrackBox";
+const NEW_DNT_ID = "doNotTrackBox";
+const DNT_CHECKBOX_ID = "doNotTrackCheckbox";
+
+// Test the section is hidden on page load if the feature pref is disabled.
+// Also make sure we keep the old DNT interface.
+add_task(async function test_section_hidden_when_feature_flag_disabled() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [FEATURE_PREF, false],
+      [MODE_PREF, false],
+    ],
+  });
+
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "about:preferences#privacy" },
+    async function (browser) {
+      let gpc = browser.contentDocument.getElementById(GPC_ID);
+      is_element_hidden(gpc, "#globalPrivacyControlBox is hidden");
+      let new_dnt = browser.contentDocument.getElementById(NEW_DNT_ID);
+      is_element_hidden(new_dnt, "#doNotTrackBox is hidden");
+      let old_dnt = browser.contentDocument.getElementById(OLD_DNT_ID);
+      is_element_visible(old_dnt, "#doNotTrackBox is shown");
+    }
+  );
+
+  await SpecialPowers.popPrefEnv();
+});
+
+// Test the section is shown on page load if the feature pref is enabled.
+// Also make sure we show the new DNT interface.
+add_task(async function test_section_shown_when_feature_flag_enabled() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [FEATURE_PREF, true],
+      [MODE_PREF, false],
+    ],
+  });
+
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "about:preferences#privacy" },
+    async function (browser) {
+      let gpc = browser.contentDocument.getElementById(GPC_ID);
+      is_element_visible(gpc, "#globalPrivacyControlBox is shown");
+      let new_dnt = browser.contentDocument.getElementById(NEW_DNT_ID);
+      is_element_visible(new_dnt, "#doNotTrackBox is shown");
+      let old_dnt = browser.contentDocument.getElementById(OLD_DNT_ID);
+      is_element_hidden(old_dnt, "#doNotTrackBox is hidden");
+    }
+  );
+
+  await SpecialPowers.popPrefEnv();
+});
+
+// Test the checkbox is unchecked in DISABLED mode.
+add_task(async function test_checkbox_unchecked_disabled_mode() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [FEATURE_PREF, true],
+      [MODE_PREF, false],
+    ],
+  });
+
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "about:preferences#privacy" },
+    async function (browser) {
+      let checkbox = browser.contentDocument.getElementById(GPC_CHECKBOX_ID);
+      ok(!checkbox.checked, "checkbox is not checked in DISABLED mode");
+    }
+  );
+
+  await SpecialPowers.popPrefEnv();
+});
+
+// Test that toggling the checkbox toggles the mode pref value as expected
+add_task(async function test_checkbox_modifies_prefs() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [FEATURE_PREF, true],
+      [MODE_PREF, false],
+    ],
+  });
+
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "about:preferences#privacy" },
+    async function (browser) {
+      let gpc_checkbox =
+        browser.contentDocument.getElementById(GPC_CHECKBOX_ID);
+      let dnt_checkbox =
+        browser.contentDocument.getElementById(DNT_CHECKBOX_ID);
+      let section = browser.contentDocument.getElementById(SECTION_ID);
+
+      section.scrollIntoView();
+
+      Assert.ok(
+        !gpc_checkbox.checked && !dnt_checkbox.checked,
+        "initially, the checkbox should be unchecked"
+      );
+
+      await BrowserTestUtils.synthesizeMouseAtCenter(
+        "#" + GPC_CHECKBOX_ID,
+        {},
+        browser
+      );
+      Assert.ok(
+        gpc_checkbox.checked && !dnt_checkbox.checked,
+        "gpc checkbox should be checked"
+      );
+      Assert.equal(
+        true,
+        Services.prefs.getBoolPref(MODE_PREF),
+        "GPC should be on after checking the checkbox"
+      );
+      Assert.equal(
+        false,
+        Services.prefs.getBoolPref(DNT_PREF),
+        "DNT should still be disabled after checking the checkbox"
+      );
+
+      await BrowserTestUtils.synthesizeMouseAtCenter(
+        "#" + DNT_CHECKBOX_ID,
+        {},
+        browser
+      );
+      Assert.ok(
+        gpc_checkbox.checked && dnt_checkbox.checked,
+        "both checkboxes are enabled"
+      );
+      Assert.equal(
+        true,
+        Services.prefs.getBoolPref(MODE_PREF),
+        "GPC should still be on after checking the DNT checkbox"
+      );
+      Assert.equal(
+        true,
+        Services.prefs.getBoolPref(DNT_PREF),
+        "DNT should still be enabled after checking the checkbox"
+      );
+
+      await BrowserTestUtils.synthesizeMouseAtCenter(
+        "#" + DNT_CHECKBOX_ID,
+        {},
+        browser
+      );
+      await BrowserTestUtils.synthesizeMouseAtCenter(
+        "#" + GPC_CHECKBOX_ID,
+        {},
+        browser
+      );
+      Assert.ok(
+        !gpc_checkbox.checked && !dnt_checkbox.checked,
+        "both checkboxes are disabled"
+      );
+      Assert.equal(
+        false,
+        Services.prefs.getBoolPref(MODE_PREF),
+        "GPC should be unchecked"
+      );
+      Assert.equal(
+        false,
+        Services.prefs.getBoolPref(DNT_PREF),
+        "DNT should be unchecked"
+      );
+    }
+  );
+
+  await SpecialPowers.popPrefEnv();
+});
diff --git a/browser/components/preferences/tests/browser_privacy_passwordGenerationAndAutofill.js b/browser/components/preferences/tests/browser_privacy_passwordGenerationAndAutofill.js
new file mode 100644
index 0000000000..6a6e419229
--- /dev/null
+++ b/browser/components/preferences/tests/browser_privacy_passwordGenerationAndAutofill.js
@@ -0,0 +1,199 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+add_task(async function initialState() {
+  // check pref permutations to verify the UI opens in the correct state
+  const prefTests = [
+    {
+      initialPrefs: [
+        ["signon.rememberSignons", true],
+        ["signon.generation.available", true],
+        ["signon.generation.enabled", true],
+        ["signon.autofillForms", true],
+      ],
+      expected: "checked",
+    },
+    {
+      initialPrefs: [
+        ["signon.rememberSignons", true],
+        ["signon.generation.available", true],
+        ["signon.generation.enabled", false],
+        ["signon.autofillForms", false],
+      ],
+      expected: "unchecked",
+    },
+    {
+      initialPrefs: [
+        ["signon.rememberSignons", true],
+        ["signon.generation.available", false],
+        ["signon.generation.enabled", false],
+      ],
+      expected: "hidden",
+    },
+    {
+      initialPrefs: [
+        ["signon.rememberSignons", false],
+        ["signon.generation.available", true],
+        ["signon.generation.enabled", true],
+        ["signon.autofillForms", true],
+      ],
+      expected: "disabled",
+    },
+  ];
+  for (let test of prefTests) {
+    // set initial pref values
+    info("initialState, testing with: " + JSON.stringify(test));
+    await SpecialPowers.pushPrefEnv({ set: test.initialPrefs });
+
+    // open about:privacy in a tab
+    // verify expected conditions
+    await BrowserTestUtils.withNewTab(
+      {
+        gBrowser,
+        url: "about:preferences#privacy",
+      },
+      async function (browser) {
+        let doc = browser.contentDocument;
+        let generatePasswordsCheckbox = doc.getElementById("generatePasswords");
+        let autofillFormsCheckbox = doc.getElementById(
+          "passwordAutofillCheckbox"
+        );
+        doc.getElementById("passwordSettings").scrollIntoView();
+
+        info("initialState, assert on expected state:" + test.expected);
+        switch (test.expected) {
+          case "hidden":
+            is_element_hidden(
+              generatePasswordsCheckbox,
+              "#generatePasswords checkbox is hidden"
+            );
+            break;
+          case "checked":
+            is_element_visible(
+              generatePasswordsCheckbox,
+              "#generatePasswords checkbox is visible"
+            );
+            ok(
+              generatePasswordsCheckbox.checked,
+              "#generatePasswords checkbox is checked"
+            );
+            ok(
+              autofillFormsCheckbox.checked,
+              "#passwordAutofillCheckbox is checked"
+            );
+            break;
+          case "unchecked":
+            ok(
+              !generatePasswordsCheckbox.checked,
+              "#generatePasswords checkbox is un-checked"
+            );
+            ok(
+              !autofillFormsCheckbox.checked,
+              "#passwordAutofillCheckbox is un-checked"
+            );
+            break;
+          case "disabled":
+            ok(
+              generatePasswordsCheckbox.disabled,
+              "#generatePasswords checkbox is disabled"
+            );
+            ok(
+              autofillFormsCheckbox.disabled,
+              "#passwordAutofillCheckbox is disabled"
+            );
+            break;
+          default:
+            ok(false, "Unknown expected state: " + test.expected);
+        }
+      }
+    );
+    await SpecialPowers.popPrefEnv();
+  }
+});
+
+add_task(async function toggleGenerationEnabled() {
+  // clicking the checkbox should toggle the pref
+  SpecialPowers.pushPrefEnv({
+    set: [
+      ["signon.generation.available", true],
+      ["signon.generation.enabled", false],
+      ["signon.rememberSignons", true],
+    ],
+  });
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: "about:preferences#privacy",
+    },
+    async function (browser) {
+      let doc = browser.contentDocument;
+      let checkbox = doc.getElementById("generatePasswords");
+
+      info("waiting for the browser to have focus");
+      await SimpleTest.promiseFocus(browser);
+      let prefChanged = TestUtils.waitForPrefChange(
+        "signon.generation.enabled"
+      );
+
+      // the preferences "Search" bar obscures the checkbox if we scrollIntoView and try to click on it
+      // so use keyboard events instead
+      checkbox.focus();
+      is(doc.activeElement, checkbox, "checkbox is focused");
+      EventUtils.synthesizeKey(" ");
+
+      info("waiting for pref to change");
+      await prefChanged;
+      ok(checkbox.checked, "#generatePasswords checkbox is checked");
+      ok(
+        Services.prefs.getBoolPref("signon.generation.enabled"),
+        "enabled pref is now true"
+      );
+    }
+  );
+  await SpecialPowers.popPrefEnv();
+});
+
+add_task(async function toggleRememberSignon() {
+  // toggling rememberSignons checkbox should make generation checkbox disabled
+  SpecialPowers.pushPrefEnv({
+    set: [
+      ["signon.generation.available", true],
+      ["signon.generation.enabled", true],
+      ["signon.rememberSignons", true],
+    ],
+  });
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: "about:preferences#privacy",
+    },
+    async function (browser) {
+      let doc = browser.contentDocument;
+      let checkbox = doc.getElementById("savePasswords");
+      let generationCheckbox = doc.getElementById("generatePasswords");
+
+      ok(
+        !generationCheckbox.disabled,
+        "generation checkbox is not initially disabled"
+      );
+
+      info("waiting for the browser to have focus");
+      await SimpleTest.promiseFocus(browser);
+      let prefChanged = TestUtils.waitForPrefChange("signon.rememberSignons");
+
+      // the preferences "Search" bar obscures the checkbox if we scrollIntoView and try to click on it
+      // so use keyboard events instead
+      checkbox.focus();
+      is(doc.activeElement, checkbox, "checkbox is focused");
+      EventUtils.synthesizeKey(" ");
+
+      info("waiting for pref to change");
+      await prefChanged;
+      ok(!checkbox.checked, "#savePasswords checkbox is un-checked");
+      ok(generationCheckbox.disabled, "generation checkbox becomes disabled");
+    }
+  );
+  await SpecialPowers.popPrefEnv();
+});
diff --git a/browser/components/preferences/tests/browser_privacy_relayIntegration.js b/browser/components/preferences/tests/browser_privacy_relayIntegration.js
new file mode 100644
index 0000000000..23d62f38bd
--- /dev/null
+++ b/browser/components/preferences/tests/browser_privacy_relayIntegration.js
@@ -0,0 +1,251 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+add_task(async function initialState() {
+  // check pref permutations to verify the UI opens in the correct state
+  const prefTests = [
+    {
+      initialPrefs: [
+        ["signon.firefoxRelay.feature", undefined],
+        ["signon.rememberSignons", true],
+      ],
+      expected: "hidden",
+    },
+    {
+      initialPrefs: [
+        ["signon.firefoxRelay.feature", "available"],
+        ["signon.rememberSignons", true],
+      ],
+      expected: "checked",
+    },
+    {
+      initialPrefs: [
+        ["signon.firefoxRelay.feature", "enabled"],
+        ["signon.rememberSignons", true],
+      ],
+      expected: "checked",
+    },
+    {
+      initialPrefs: [
+        ["signon.firefoxRelay.feature", "disabled"],
+        ["signon.rememberSignons", true],
+      ],
+      expected: "unchecked",
+    },
+    {
+      initialPrefs: [
+        ["signon.firefoxRelay.feature", undefined],
+        ["signon.rememberSignons", false],
+      ],
+      expected: "hidden",
+    },
+    {
+      initialPrefs: [
+        ["signon.firefoxRelay.feature", "available"],
+        ["signon.rememberSignons", false],
+      ],
+      expected: "checked",
+    },
+    {
+      initialPrefs: [
+        ["signon.firefoxRelay.feature", "enabled"],
+        ["signon.rememberSignons", false],
+      ],
+      expected: "checked",
+    },
+    {
+      initialPrefs: [
+        ["signon.firefoxRelay.feature", "disabled"],
+        ["signon.rememberSignons", false],
+      ],
+      expected: "unchecked",
+    },
+  ];
+  for (let test of prefTests) {
+    // set initial pref values
+    info("initialState, testing with: " + JSON.stringify(test));
+    await SpecialPowers.pushPrefEnv({ set: test.initialPrefs });
+
+    // open about:privacy in a tab
+    // verify expected conditions
+    await BrowserTestUtils.withNewTab(
+      {
+        gBrowser,
+        url: "about:preferences#privacy",
+      },
+      async function (browser) {
+        const doc = browser.contentDocument;
+        const relayGroup = doc.getElementById("relayIntegrationBox");
+        const checkbox = doc.getElementById("relayIntegration");
+        const savePasswords = doc.getElementById("savePasswords");
+        doc.getElementById("passwordSettings").scrollIntoView();
+
+        Assert.equal(
+          checkbox.disabled,
+          !savePasswords.checked,
+          "#relayIntegration checkbox disabled when #passwordAutofillCheckbox is unchecked"
+        );
+
+        switch (test.expected) {
+          case "hidden":
+            is_element_hidden(relayGroup, "#relayIntegrationBox is hidden");
+            break;
+          case "checked":
+            is_element_visible(relayGroup, "#relayIntegrationBox is visible");
+            Assert.ok(
+              checkbox.checked,
+              "#relayIntegration checkbox is checked"
+            );
+            break;
+          case "unchecked":
+            is_element_visible(relayGroup, "#relayIntegrationBox is visible");
+            Assert.ok(
+              !checkbox.checked,
+              "#relayIntegration checkbox is un-checked"
+            );
+            break;
+          default:
+            Assert.ok(false, "Unknown expected state: " + test.expected);
+            break;
+        }
+      }
+    );
+    await SpecialPowers.popPrefEnv();
+  }
+});
+
+add_task(async function toggleRelayIntegration() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["signon.firefoxRelay.feature", "enabled"],
+      ["signon.rememberSignons", true],
+    ],
+  });
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: "about:preferences#privacy",
+    },
+    async browser => {
+      await SimpleTest.promiseFocus(browser);
+
+      // the preferences "Search" bar obscures the checkbox if we scrollIntoView and try to click on it
+      // so use keyboard events instead
+      const doc = browser.contentDocument;
+      const relayCheckbox = doc.getElementById("relayIntegration");
+      relayCheckbox.focus();
+      Assert.equal(doc.activeElement, relayCheckbox, "checkbox is focused");
+      Assert.equal(
+        relayCheckbox.checked,
+        true,
+        "#relayIntegration checkbox is not checked"
+      );
+
+      async function clickOnFeatureCheckbox(
+        expectedPrefValue,
+        expectedCheckValue,
+        message
+      ) {
+        const prefChanged = TestUtils.waitForPrefChange(
+          "signon.firefoxRelay.feature"
+        );
+        EventUtils.synthesizeKey(" ");
+        await prefChanged;
+        Assert.equal(
+          Services.prefs.getStringPref("signon.firefoxRelay.feature"),
+          expectedPrefValue,
+          message
+        );
+        Assert.equal(
+          relayCheckbox.checked,
+          expectedCheckValue,
+          `#relayIntegration checkbox is ${
+            expectedCheckValue ? "checked" : "unchecked"
+          }`
+        );
+      }
+
+      await clickOnFeatureCheckbox(
+        "disabled",
+        false,
+        'Turn integration off from "enabled" feature state'
+      );
+      await clickOnFeatureCheckbox(
+        "available",
+        true,
+        'Turn integration on from "enabled" feature state'
+      );
+      await clickOnFeatureCheckbox(
+        "disabled",
+        false,
+        'Turn integration off from "enabled" feature state'
+      );
+    }
+  );
+  await SpecialPowers.popPrefEnv();
+});
+
+add_task(async function toggleRememberSignon() {
+  // toggling rememberSignons checkbox should make generation checkbox disabled
+  SpecialPowers.pushPrefEnv({
+    set: [
+      ["signon.firefoxRelay.feature", "available"],
+      ["signon.rememberSignons", true],
+    ],
+  });
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: "about:preferences#privacy",
+    },
+    async function (browser) {
+      const doc = browser.contentDocument;
+      const checkbox = doc.getElementById("savePasswords");
+      const relayCheckbox = doc.getElementById("relayIntegration");
+
+      Assert.ok(
+        !relayCheckbox.disabled,
+        "generation checkbox is not initially disabled"
+      );
+
+      await SimpleTest.promiseFocus(browser);
+      const prefChanged = TestUtils.waitForPrefChange("signon.rememberSignons");
+
+      // the preferences "Search" bar obscures the checkbox if we scrollIntoView and try to click on it
+      // so use keyboard events instead
+      checkbox.focus();
+      Assert.equal(doc.activeElement, checkbox, "checkbox is focused");
+      EventUtils.synthesizeKey(" ");
+
+      await prefChanged;
+      Assert.ok(!checkbox.checked, "#savePasswords checkbox is un-checked");
+      Assert.ok(
+        relayCheckbox.disabled,
+        "Relay integration checkbox becomes disabled"
+      );
+    }
+  );
+  await SpecialPowers.popPrefEnv();
+});
+
+add_task(async function testLockedRelayPreference() {
+  // Locking relay preference should disable checkbox
+  Services.prefs.lockPref("signon.firefoxRelay.feature");
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: "about:preferences#privacy",
+    },
+    async function (browser) {
+      const doc = browser.contentDocument;
+      const relayCheckbox = doc.getElementById("relayIntegration");
+
+      Assert.ok(relayCheckbox.disabled, "Relay checkbox should be disabled");
+    }
+  );
+
+  Services.prefs.unlockPref("signon.firefoxRelay.feature");
+});
diff --git a/browser/components/preferences/tests/browser_privacy_segmentation_pref.js b/browser/components/preferences/tests/browser_privacy_segmentation_pref.js
new file mode 100644
index 0000000000..43a6af2e53
--- /dev/null
+++ b/browser/components/preferences/tests/browser_privacy_segmentation_pref.js
@@ -0,0 +1,131 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test the privacy segmentation pref and preferences UI.
+
+"use strict";
+
+const PREF = "browser.dataFeatureRecommendations.enabled";
+const PREF_VISIBILITY = "browser.privacySegmentation.preferences.show";
+
+add_task(async function test_preferences_section() {
+  if (!AppConstants.MOZ_DATA_REPORTING) {
+    ok(true, "Skipping test because data reporting is disabled");
+    return;
+  }
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let section = doc.getElementById("privacySegmentationSection");
+  let sectionHeader = section.querySelector("h2");
+  let sectionDescription = section.querySelector("label");
+  let radioGroup = section.querySelector(
+    "#privacyDataFeatureRecommendationRadioGroup"
+  );
+  let radioEnabled = radioGroup.querySelector(
+    "#privacyDataFeatureRecommendationEnabled"
+  );
+  let radioDisabled = radioGroup.querySelector(
+    "#privacyDataFeatureRecommendationDisabled"
+  );
+
+  for (let show of [false, true]) {
+    Services.prefs.setBoolPref(PREF_VISIBILITY, show);
+    let showStr = show ? "visible" : "hidden";
+
+    is(
+      BrowserTestUtils.isVisible(section),
+      show,
+      `Privacy Segmentation section should be ${showStr}.`
+    );
+    is(
+      BrowserTestUtils.isVisible(sectionHeader),
+      show,
+      `Privacy Segmentation section header should be ${showStr}.`
+    );
+    is(
+      BrowserTestUtils.isVisible(sectionDescription),
+      show,
+      `Privacy Segmentation section description should be ${showStr}.`
+    );
+    is(
+      BrowserTestUtils.isVisible(radioGroup),
+      show,
+      `Privacy Segmentation radio group should be ${showStr}.`
+    );
+
+    // The section is visible, test radio buttons.
+    if (show) {
+      Services.prefs.setBoolPref(PREF, false);
+
+      is(
+        radioGroup.value,
+        "false",
+        "Radio group should reflect initial pref state of false."
+      );
+
+      info("Selecting radio on.");
+      radioEnabled.click();
+      is(
+        Services.prefs.getBoolPref(PREF),
+        true,
+        "Privacy Segmentation should be enabled."
+      );
+
+      info("Selecting radio off.");
+      radioDisabled.click();
+      is(
+        Services.prefs.getBoolPref(PREF),
+        false,
+        "Privacy Segmentation should be disabled."
+      );
+
+      info("Updating pref externally");
+      is(
+        radioGroup.value,
+        "false",
+        "Radio group should reflect initial pref state of false."
+      );
+      Services.prefs.setBoolPref(PREF, true);
+      await BrowserTestUtils.waitForMutationCondition(
+        radioGroup,
+        { attributeFilter: ["value"] },
+        () => radioGroup.value == "true"
+      );
+      is(
+        radioGroup.value,
+        "true",
+        "Updating Privacy Segmentation pref also updates radio group."
+      );
+    }
+  }
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  Services.prefs.clearUserPref(PREF_VISIBILITY);
+  Services.prefs.clearUserPref(PREF);
+});
+
+add_task(async function test_preferences_section_data_reporting_disabled() {
+  if (AppConstants.MOZ_DATA_REPORTING) {
+    ok(true, "Skipping test because data reporting is enabled");
+    return;
+  }
+
+  for (let show of [false, true]) {
+    Services.prefs.setBoolPref(PREF_VISIBILITY, show);
+    await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+
+    let doc = gBrowser.selectedBrowser.contentDocument;
+    let section = doc.getElementById("privacySegmentationSection");
+    is(
+      !!section,
+      show,
+      "Section should only exist when privacy segmentation section is enabled."
+    );
+
+    BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  }
+
+  Services.prefs.clearUserPref(PREF_VISIBILITY);
+});
diff --git a/browser/components/preferences/tests/browser_privacy_syncDataClearing.js b/browser/components/preferences/tests/browser_privacy_syncDataClearing.js
new file mode 100644
index 0000000000..d5b6b904ab
--- /dev/null
+++ b/browser/components/preferences/tests/browser_privacy_syncDataClearing.js
@@ -0,0 +1,287 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * With no custom cleaning categories set and sanitizeOnShutdown disabled,
+ * the checkboxes "alwaysClear" and "deleteOnClose" should share the same state.
+ * The state of the cleaning categories cookies, cache and offlineApps should be in the state of the "deleteOnClose" box.
+ */
+add_task(async function test_syncWithoutCustomPrefs() {
+  await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+
+  let document = gBrowser.contentDocument;
+  let deleteOnCloseBox = document.getElementById("deleteOnClose");
+  let alwaysClearBox = document.getElementById("alwaysClear");
+
+  ok(!deleteOnCloseBox.checked, "DeleteOnClose initial state is deselected");
+  ok(!alwaysClearBox.checked, "AlwaysClear initial state is deselected");
+
+  deleteOnCloseBox.click();
+
+  ok(deleteOnCloseBox.checked, "DeleteOnClose is selected");
+  is(
+    deleteOnCloseBox.checked,
+    alwaysClearBox.checked,
+    "DeleteOnClose sets alwaysClear in the same state, selected"
+  );
+  ok(
+    Services.prefs.getBoolPref("privacy.clearOnShutdown.cookies"),
+    "Cookie cleaning pref is set"
+  );
+  ok(
+    Services.prefs.getBoolPref("privacy.clearOnShutdown.cache"),
+    "Cache cleaning pref is set"
+  );
+  ok(
+    Services.prefs.getBoolPref("privacy.clearOnShutdown.offlineApps"),
+    "OfflineApps cleaning pref is set"
+  );
+  ok(
+    !Services.prefs.getBoolPref("privacy.clearOnShutdown.downloads"),
+    "Downloads cleaning pref is not set"
+  );
+
+  deleteOnCloseBox.click();
+
+  ok(!deleteOnCloseBox.checked, "DeleteOnClose is deselected");
+  is(
+    deleteOnCloseBox.checked,
+    alwaysClearBox.checked,
+    "DeleteOnclose sets alwaysClear in the same state, deselected"
+  );
+
+  ok(
+    !Services.prefs.getBoolPref("privacy.clearOnShutdown.cookies"),
+    "Cookie cleaning pref is reset"
+  );
+  ok(
+    !Services.prefs.getBoolPref("privacy.clearOnShutdown.cache"),
+    "Cache cleaning pref is reset"
+  );
+  ok(
+    !Services.prefs.getBoolPref("privacy.clearOnShutdown.offlineApps"),
+    "OfflineApps cleaning pref is reset"
+  );
+  ok(
+    !Services.prefs.getBoolPref("privacy.clearOnShutdown.downloads"),
+    "Downloads cleaning pref is not set"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  Services.prefs.clearUserPref("privacy.clearOnShutdown.downloads");
+  Services.prefs.clearUserPref("privacy.clearOnShutdown.offlineApps");
+  Services.prefs.clearUserPref("privacy.clearOnShutdown.cache");
+  Services.prefs.clearUserPref("privacy.clearOnShutdown.cookies");
+  Services.prefs.clearUserPref("privacy.sanitize.sanitizeOnShutdown");
+});
+
+/*
+ * With custom cleaning category already set and SanitizeOnShutdown enabled,
+ * deselecting "deleteOnClose" should not change the state of "alwaysClear".
+ * The state of the cleaning categories cookies, cache and offlineApps should be in the state of the "deleteOnClose" box.
+ */
+add_task(async function test_syncWithCustomPrefs() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["privacy.clearOnShutdown.history", true],
+      ["privacy.sanitize.sanitizeOnShutdown", true],
+    ],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+
+  let document = gBrowser.contentDocument;
+  let deleteOnCloseBox = document.getElementById("deleteOnClose");
+  let alwaysClearBox = document.getElementById("alwaysClear");
+
+  ok(!deleteOnCloseBox.checked, "DeleteOnClose initial state is deselected");
+  ok(alwaysClearBox.checked, "AlwaysClear initial state is selected");
+
+  deleteOnCloseBox.click();
+
+  ok(deleteOnCloseBox.checked, "DeleteOnClose is selected");
+  is(
+    deleteOnCloseBox.checked,
+    alwaysClearBox.checked,
+    "AlwaysClear and deleteOnClose are in the same state, selected"
+  );
+  ok(
+    Services.prefs.getBoolPref("privacy.clearOnShutdown.history"),
+    "History cleaning pref is still set"
+  );
+
+  ok(
+    Services.prefs.getBoolPref("privacy.clearOnShutdown.cookies"),
+    "Cookie cleaning pref is set"
+  );
+  ok(
+    Services.prefs.getBoolPref("privacy.clearOnShutdown.cache"),
+    "Cache cleaning pref is set"
+  );
+  ok(
+    Services.prefs.getBoolPref("privacy.clearOnShutdown.offlineApps"),
+    "OfflineApps cleaning pref is set"
+  );
+
+  deleteOnCloseBox.click();
+
+  ok(!deleteOnCloseBox.checked, "DeleteOnClose is deselected");
+  is(
+    !deleteOnCloseBox.checked,
+    alwaysClearBox.checked,
+    "AlwaysClear is not synced with deleteOnClose, only deleteOnClose is deselected"
+  );
+
+  ok(
+    !Services.prefs.getBoolPref("privacy.clearOnShutdown.cookies"),
+    "Cookie cleaning pref is reset"
+  );
+  ok(
+    !Services.prefs.getBoolPref("privacy.clearOnShutdown.cache"),
+    "Cache cleaning pref is reset"
+  );
+  ok(
+    !Services.prefs.getBoolPref("privacy.clearOnShutdown.offlineApps"),
+    "OfflineApps cleaning pref is reset"
+  );
+  ok(
+    Services.prefs.getBoolPref("privacy.clearOnShutdown.history"),
+    "History cleaning pref is still set"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  await SpecialPowers.popPrefEnv();
+});
+
+/*
+ * Setting/resetting cleaning prefs for cookies, cache, offline apps
+ * and selecting/deselecting the "alwaysClear" Box, also selects/deselects
+ * the "deleteOnClose" box.
+ */
+
+add_task(async function test_syncWithCustomPrefs() {
+  await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+
+  let document = gBrowser.contentDocument;
+  let deleteOnCloseBox = document.getElementById("deleteOnClose");
+  let alwaysClearBox = document.getElementById("alwaysClear");
+
+  ok(!deleteOnCloseBox.checked, "DeleteOnClose initial state is deselected");
+  ok(!alwaysClearBox.checked, "AlwaysClear initial state is deselected");
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["privacy.clearOnShutdown.cookies", true],
+      ["privacy.clearOnShutdown.cache", true],
+      ["privacy.clearOnShutdown.offlineApps", true],
+      ["privacy.sanitize.sanitizeOnShutdown", true],
+    ],
+  });
+
+  ok(alwaysClearBox.checked, "AlwaysClear is selected");
+  is(
+    deleteOnCloseBox.checked,
+    alwaysClearBox.checked,
+    "AlwaysClear and deleteOnClose are in the same state, selected"
+  );
+
+  alwaysClearBox.click();
+
+  ok(!alwaysClearBox.checked, "AlwaysClear is deselected");
+  is(
+    deleteOnCloseBox.checked,
+    alwaysClearBox.checked,
+    "AlwaysClear and deleteOnClose are in the same state, deselected"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  await SpecialPowers.popPrefEnv();
+});
+
+/*
+ * On loading the page, the ClearOnClose box should be set according to the pref selection
+ */
+add_task(async function test_initialState() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["privacy.clearOnShutdown.cookies", true],
+      ["privacy.clearOnShutdown.cache", true],
+      ["privacy.clearOnShutdown.offlineApps", true],
+      ["privacy.sanitize.sanitizeOnShutdown", true],
+    ],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+
+  let document = gBrowser.contentDocument;
+  let deleteOnCloseBox = document.getElementById("deleteOnClose");
+
+  ok(
+    deleteOnCloseBox.checked,
+    "DeleteOnClose is set accordingly to the prefs, selected"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["privacy.clearOnShutdown.cookies", false],
+      ["privacy.clearOnShutdown.cache", false],
+      ["privacy.clearOnShutdown.offlineApps", false],
+      ["privacy.sanitize.sanitizeOnShutdown", true],
+      ["privacy.clearOnShutdown.history", true],
+    ],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+
+  document = gBrowser.contentDocument;
+  deleteOnCloseBox = document.getElementById("deleteOnClose");
+
+  ok(
+    !deleteOnCloseBox.checked,
+    "DeleteOnClose is set accordingly to the prefs, deselected"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  // When private browsing mode autostart is selected, the deleteOnClose Box is selected always
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["privacy.clearOnShutdown.cookies", false],
+      ["privacy.clearOnShutdown.cache", false],
+      ["privacy.clearOnShutdown.offlineApps", false],
+      ["privacy.sanitize.sanitizeOnShutdown", false],
+      ["browser.privatebrowsing.autostart", true],
+    ],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+
+  document = gBrowser.contentDocument;
+  deleteOnCloseBox = document.getElementById("deleteOnClose");
+
+  ok(
+    deleteOnCloseBox.checked,
+    "DeleteOnClose is set accordingly to the private Browsing autostart pref, selected"
+  );
+
+  // Reset history mode
+  let historyMode = document.getElementById("historyMode");
+  historyMode.value = "remember";
+  historyMode.doCommand();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  await SpecialPowers.popPrefEnv();
+});
diff --git a/browser/components/preferences/tests/browser_privacypane_2.js b/browser/components/preferences/tests/browser_privacypane_2.js
new file mode 100644
index 0000000000..46fb3347c8
--- /dev/null
+++ b/browser/components/preferences/tests/browser_privacypane_2.js
@@ -0,0 +1,19 @@
+let rootDir = getRootDirectory(gTestPath);
+let jar = getJar(rootDir);
+if (jar) {
+  let tmpdir = extractJarToTmp(jar);
+  rootDir = "file://" + tmpdir.path + "/";
+}
+/* import-globals-from privacypane_tests_perwindow.js */
+Services.scriptloader.loadSubScript(
+  rootDir + "privacypane_tests_perwindow.js",
+  this
+);
+
+run_test_subset([
+  test_pane_visibility,
+  test_dependent_elements,
+  test_dependent_cookie_elements,
+  test_dependent_clearonclose_elements,
+  test_dependent_prefs,
+]);
diff --git a/browser/components/preferences/tests/browser_privacypane_3.js b/browser/components/preferences/tests/browser_privacypane_3.js
new file mode 100644
index 0000000000..e88a6059eb
--- /dev/null
+++ b/browser/components/preferences/tests/browser_privacypane_3.js
@@ -0,0 +1,21 @@
+let rootDir = getRootDirectory(gTestPath);
+let jar = getJar(rootDir);
+if (jar) {
+  let tmpdir = extractJarToTmp(jar);
+  rootDir = "file://" + tmpdir.path + "/";
+}
+/* import-globals-from privacypane_tests_perwindow.js */
+Services.scriptloader.loadSubScript(
+  rootDir + "privacypane_tests_perwindow.js",
+  this
+);
+
+run_test_subset([
+  test_custom_retention("rememberHistory", "remember"),
+  test_custom_retention("rememberHistory", "custom"),
+  test_custom_retention("rememberForms", "custom"),
+  test_custom_retention("rememberForms", "custom"),
+  test_historymode_retention("remember", "custom"),
+  test_custom_retention("alwaysClear", "remember"),
+  test_custom_retention("alwaysClear", "custom"),
+]);
diff --git a/browser/components/preferences/tests/browser_proxy_backup.js b/browser/components/preferences/tests/browser_proxy_backup.js
new file mode 100644
index 0000000000..fc05e19ada
--- /dev/null
+++ b/browser/components/preferences/tests/browser_proxy_backup.js
@@ -0,0 +1,84 @@
+/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+function test() {
+  waitForExplicitFinish();
+
+  // network.proxy.type needs to be backed up and restored because mochitest
+  // changes this setting from the default
+  let oldNetworkProxyType = Services.prefs.getIntPref("network.proxy.type");
+  registerCleanupFunction(function () {
+    Services.prefs.setIntPref("network.proxy.type", oldNetworkProxyType);
+    Services.prefs.clearUserPref("network.proxy.share_proxy_settings");
+    for (let proxyType of ["http", "ssl", "socks"]) {
+      Services.prefs.clearUserPref("network.proxy." + proxyType);
+      Services.prefs.clearUserPref("network.proxy." + proxyType + "_port");
+      if (proxyType == "http") {
+        continue;
+      }
+      Services.prefs.clearUserPref("network.proxy.backup." + proxyType);
+      Services.prefs.clearUserPref(
+        "network.proxy.backup." + proxyType + "_port"
+      );
+    }
+    // On accepting the dialog, we also write TRR values, so we need to clear
+    // them. They are tested separately in browser_privacy_dnsoverhttps.js.
+    Services.prefs.clearUserPref("network.trr.mode");
+    Services.prefs.clearUserPref("network.trr.uri");
+  });
+
+  let connectionURL =
+    "chrome://browser/content/preferences/dialogs/connection.xhtml";
+
+  // Set a shared proxy and an SSL backup
+  Services.prefs.setIntPref("network.proxy.type", 1);
+  Services.prefs.setBoolPref("network.proxy.share_proxy_settings", true);
+  Services.prefs.setCharPref("network.proxy.http", "example.com");
+  Services.prefs.setIntPref("network.proxy.http_port", 1200);
+  Services.prefs.setCharPref("network.proxy.ssl", "example.com");
+  Services.prefs.setIntPref("network.proxy.ssl_port", 1200);
+  Services.prefs.setCharPref("network.proxy.backup.ssl", "127.0.0.1");
+  Services.prefs.setIntPref("network.proxy.backup.ssl_port", 9050);
+
+  /*
+  The connection dialog alone won't save onaccept since it uses type="child",
+  so it has to be opened as a sub dialog of the main pref tab.
+  Open the main tab here.
+  */
+  open_preferences(async function tabOpened(aContentWindow) {
+    is(
+      gBrowser.currentURI.spec,
+      "about:preferences",
+      "about:preferences loaded"
+    );
+    let dialog = await openAndLoadSubDialog(connectionURL);
+    let dialogElement = dialog.document.getElementById("ConnectionsDialog");
+    let dialogClosingPromise = BrowserTestUtils.waitForEvent(
+      dialogElement,
+      "dialogclosing"
+    );
+
+    ok(dialog, "connection window opened");
+    dialogElement.acceptDialog();
+
+    let dialogClosingEvent = await dialogClosingPromise;
+    ok(dialogClosingEvent, "connection window closed");
+
+    // The SSL backup should not be replaced by the shared value
+    is(
+      Services.prefs.getCharPref("network.proxy.backup.ssl"),
+      "127.0.0.1",
+      "Shared proxy backup shouldn't be replaced"
+    );
+    is(
+      Services.prefs.getIntPref("network.proxy.backup.ssl_port"),
+      9050,
+      "Shared proxy port backup shouldn't be replaced"
+    );
+
+    gBrowser.removeCurrentTab();
+    finish();
+  });
+}
diff --git a/browser/components/preferences/tests/browser_sanitizeOnShutdown_prefLocked.js b/browser/components/preferences/tests/browser_sanitizeOnShutdown_prefLocked.js
new file mode 100644
index 0000000000..2a7cb2d10e
--- /dev/null
+++ b/browser/components/preferences/tests/browser_sanitizeOnShutdown_prefLocked.js
@@ -0,0 +1,47 @@
+"use strict";
+
+function switchToCustomHistoryMode(doc) {
+  // Select the last item in the menulist.
+  let menulist = doc.getElementById("historyMode");
+  menulist.focus();
+  EventUtils.sendKey("UP");
+}
+
+function testPrefStateMatchesLockedState() {
+  let win = gBrowser.contentWindow;
+  let doc = win.document;
+  switchToCustomHistoryMode(doc);
+
+  let checkbox = doc.getElementById("alwaysClear");
+  let preference = win.Preferences.get("privacy.sanitize.sanitizeOnShutdown");
+  is(
+    checkbox.disabled,
+    preference.locked,
+    "Always Clear checkbox should be enabled when preference is not locked."
+  );
+
+  Services.prefs.clearUserPref("privacy.history.custom");
+  gBrowser.removeCurrentTab();
+}
+
+add_setup(function () {
+  registerCleanupFunction(function resetPreferences() {
+    Services.prefs.unlockPref("privacy.sanitize.sanitizeOnShutdown");
+    Services.prefs.clearUserPref("privacy.history.custom");
+  });
+});
+
+add_task(async function test_preference_enabled_when_unlocked() {
+  await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+  testPrefStateMatchesLockedState();
+});
+
+add_task(async function test_preference_disabled_when_locked() {
+  Services.prefs.lockPref("privacy.sanitize.sanitizeOnShutdown");
+  await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+    leaveOpen: true,
+  });
+  testPrefStateMatchesLockedState();
+});
diff --git a/browser/components/preferences/tests/browser_searchChangedEngine.js b/browser/components/preferences/tests/browser_searchChangedEngine.js
new file mode 100644
index 0000000000..0882c9775e
--- /dev/null
+++ b/browser/components/preferences/tests/browser_searchChangedEngine.js
@@ -0,0 +1,90 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const { AddonTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/AddonTestUtils.sys.mjs"
+);
+const { SearchTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/SearchTestUtils.sys.mjs"
+);
+const { SearchUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/SearchUtils.sys.mjs"
+);
+
+AddonTestUtils.initMochitest(this);
+SearchTestUtils.init(this);
+
+function findRow(tree, expectedName) {
+  for (let i = 0; i < tree.view.rowCount; i++) {
+    let name = tree.view.getCellText(
+      i,
+      tree.columns.getNamedColumn("engineName")
+    );
+
+    if (name == expectedName) {
+      return i;
+    }
+  }
+  return -1;
+}
+
+add_task(async function test_change_engine() {
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+
+  let doc = gBrowser.selectedBrowser.contentDocument;
+
+  await SearchTestUtils.installSearchExtension({
+    id: "example@tests.mozilla.org",
+    name: "Example",
+    version: "1.0",
+    keyword: "foo",
+    favicon_url: "img123.png",
+  });
+
+  let tree = doc.querySelector("#engineList");
+
+  let row = findRow(tree, "Example");
+
+  Assert.notEqual(row, -1, "Should have found the entry");
+  Assert.ok(
+    tree.view
+      .getImageSrc(row, tree.columns.getNamedColumn("engineName"))
+      .includes("img123.png"),
+    "Should have the correct image URL"
+  );
+  Assert.equal(
+    tree.view.getCellText(row, tree.columns.getNamedColumn("engineKeyword")),
+    "foo",
+    "Should show the correct keyword"
+  );
+
+  let updatedPromise = SearchTestUtils.promiseSearchNotification(
+    SearchUtils.MODIFIED_TYPE.CHANGED,
+    SearchUtils.TOPIC_ENGINE_MODIFIED
+  );
+  await SearchTestUtils.installSearchExtension({
+    id: "example@tests.mozilla.org",
+    name: "Example 2",
+    version: "2.0",
+    keyword: "bar",
+    favicon_url: "img456.png",
+  });
+  await updatedPromise;
+
+  row = findRow(tree, "Example 2");
+
+  Assert.notEqual(row, -1, "Should have found the updated entry");
+  Assert.ok(
+    tree.view
+      .getImageSrc(row, tree.columns.getNamedColumn("engineName"))
+      .includes("img456.png"),
+    "Should have the correct image URL"
+  );
+  Assert.equal(
+    tree.view.getCellText(row, tree.columns.getNamedColumn("engineKeyword")),
+    "bar",
+    "Should show the correct keyword"
+  );
+
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_searchDefaultEngine.js b/browser/components/preferences/tests/browser_searchDefaultEngine.js
new file mode 100644
index 0000000000..e64f88fab3
--- /dev/null
+++ b/browser/components/preferences/tests/browser_searchDefaultEngine.js
@@ -0,0 +1,372 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const { SearchTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/SearchTestUtils.sys.mjs"
+);
+
+ChromeUtils.defineESModuleGetters(this, {
+  TelemetryTestUtils: "resource://testing-common/TelemetryTestUtils.sys.mjs",
+});
+
+SearchTestUtils.init(this);
+
+add_setup(async function () {
+  await SearchTestUtils.installSearchExtension({
+    name: "engine1",
+    search_url: "https://example.com/engine1",
+    search_url_get_params: "search={searchTerms}",
+  });
+  await SearchTestUtils.installSearchExtension({
+    name: "engine2",
+    search_url: "https://example.com/engine2",
+    search_url_get_params: "search={searchTerms}",
+  });
+
+  const defaultEngine = await Services.search.getDefault();
+  const defaultPrivateEngine = await Services.search.getDefaultPrivate();
+
+  registerCleanupFunction(async () => {
+    await Services.search.setDefault(
+      defaultEngine,
+      Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+    );
+    await Services.search.setDefaultPrivate(
+      defaultPrivateEngine,
+      Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+    );
+  });
+});
+
+add_task(async function test_openWithPrivateDefaultNotEnabledFirst() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.search.separatePrivateDefault.ui.enabled", false],
+      ["browser.search.separatePrivateDefault", false],
+    ],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+
+  const doc = gBrowser.selectedBrowser.contentDocument;
+  const separateEngineCheckbox = doc.getElementById(
+    "browserSeparateDefaultEngine"
+  );
+  const privateDefaultVbox = doc.getElementById(
+    "browserPrivateEngineSelection"
+  );
+
+  Assert.ok(
+    separateEngineCheckbox.hidden,
+    "Should have hidden the separate search engine checkbox"
+  );
+  Assert.ok(
+    privateDefaultVbox.hidden,
+    "Should have hidden the private engine selection box"
+  );
+
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.separatePrivateDefault.ui.enabled", true]],
+  });
+
+  Assert.ok(
+    !separateEngineCheckbox.hidden,
+    "Should have displayed the separate search engine checkbox"
+  );
+  Assert.ok(
+    privateDefaultVbox.hidden,
+    "Should not have displayed the private engine selection box"
+  );
+
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.separatePrivateDefault", true]],
+  });
+
+  Assert.ok(
+    !separateEngineCheckbox.hidden,
+    "Should still be displaying the separate search engine checkbox"
+  );
+  Assert.ok(
+    !privateDefaultVbox.hidden,
+    "Should have displayed the private engine selection box"
+  );
+
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function test_openWithPrivateDefaultEnabledFirst() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.search.separatePrivateDefault.ui.enabled", true],
+      ["browser.search.separatePrivateDefault", true],
+    ],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+
+  const doc = gBrowser.selectedBrowser.contentDocument;
+  const separateEngineCheckbox = doc.getElementById(
+    "browserSeparateDefaultEngine"
+  );
+  const privateDefaultVbox = doc.getElementById(
+    "browserPrivateEngineSelection"
+  );
+
+  Assert.ok(
+    !separateEngineCheckbox.hidden,
+    "Should not have hidden the separate search engine checkbox"
+  );
+  Assert.ok(
+    !privateDefaultVbox.hidden,
+    "Should not have hidden the private engine selection box"
+  );
+
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.separatePrivateDefault", false]],
+  });
+
+  Assert.ok(
+    !separateEngineCheckbox.hidden,
+    "Should not have hidden the separate search engine checkbox"
+  );
+  Assert.ok(
+    privateDefaultVbox.hidden,
+    "Should have hidden the private engine selection box"
+  );
+
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.separatePrivateDefault.ui.enabled", false]],
+  });
+
+  Assert.ok(
+    separateEngineCheckbox.hidden,
+    "Should have hidden the separate private engine checkbox"
+  );
+  Assert.ok(
+    privateDefaultVbox.hidden,
+    "Should still be hiding the private engine selection box"
+  );
+
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function test_separatePrivateDefault() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.search.separatePrivateDefault.ui.enabled", true],
+      ["browser.search.separatePrivateDefault", false],
+    ],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+
+  const doc = gBrowser.selectedBrowser.contentDocument;
+  const separateEngineCheckbox = doc.getElementById(
+    "browserSeparateDefaultEngine"
+  );
+  const privateDefaultVbox = doc.getElementById(
+    "browserPrivateEngineSelection"
+  );
+
+  Assert.ok(
+    privateDefaultVbox.hidden,
+    "Should not be displaying the private engine selection box"
+  );
+
+  separateEngineCheckbox.checked = false;
+  separateEngineCheckbox.doCommand();
+
+  Assert.ok(
+    Services.prefs.getBoolPref("browser.search.separatePrivateDefault"),
+    "Should have correctly set the pref"
+  );
+
+  Assert.ok(
+    !privateDefaultVbox.hidden,
+    "Should be displaying the private engine selection box"
+  );
+
+  separateEngineCheckbox.checked = true;
+  separateEngineCheckbox.doCommand();
+
+  Assert.ok(
+    !Services.prefs.getBoolPref("browser.search.separatePrivateDefault"),
+    "Should have correctly turned the pref off"
+  );
+
+  Assert.ok(
+    privateDefaultVbox.hidden,
+    "Should have hidden the private engine selection box"
+  );
+
+  gBrowser.removeCurrentTab();
+});
+
+async function setDefaultEngine(
+  testPrivate,
+  currentEngineName,
+  expectedEngineName
+) {
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+
+  const doc = gBrowser.selectedBrowser.contentDocument;
+  const defaultEngineSelector = doc.getElementById(
+    testPrivate ? "defaultPrivateEngine" : "defaultEngine"
+  );
+
+  Assert.equal(
+    defaultEngineSelector.selectedItem.engine.name,
+    currentEngineName,
+    "Should have the correct engine as default on first open"
+  );
+
+  const popup = defaultEngineSelector.menupopup;
+  const popupShown = BrowserTestUtils.waitForEvent(popup, "popupshown");
+  EventUtils.synthesizeMouseAtCenter(
+    defaultEngineSelector,
+    {},
+    defaultEngineSelector.ownerGlobal
+  );
+  await popupShown;
+
+  const items = Array.from(popup.children);
+  const engine2Item = items.find(
+    item => item.engine.name == expectedEngineName
+  );
+
+  const defaultChanged = SearchTestUtils.promiseSearchNotification(
+    testPrivate ? "engine-default-private" : "engine-default",
+    "browser-search-engine-modified"
+  );
+  // Waiting for popupHiding here seemed to cause a race condition, however
+  // as we're really just interested in the notification, we'll just use
+  // that here.
+  EventUtils.synthesizeMouseAtCenter(engine2Item, {}, engine2Item.ownerGlobal);
+  await defaultChanged;
+
+  const newDefault = testPrivate
+    ? await Services.search.getDefaultPrivate()
+    : await Services.search.getDefault();
+  Assert.equal(
+    newDefault.name,
+    expectedEngineName,
+    "Should have changed the default engine to engine2"
+  );
+}
+
+add_task(async function test_setDefaultEngine() {
+  const engine1 = Services.search.getEngineByName("engine1");
+
+  // Set an initial default so we have a known engine.
+  await Services.search.setDefault(
+    engine1,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+
+  Services.telemetry.clearEvents();
+  Services.fog.testResetFOG();
+
+  await setDefaultEngine(false, "engine1", "engine2");
+
+  TelemetryTestUtils.assertEvents(
+    [
+      {
+        object: "change_default",
+        value: "user",
+        extra: {
+          prev_id: engine1.telemetryId,
+          new_id: "other-engine2",
+          new_name: "engine2",
+          new_load_path: "[addon]engine2@tests.mozilla.org",
+          new_sub_url: "",
+        },
+      },
+    ],
+    { category: "search", method: "engine" }
+  );
+
+  let snapshot = await Glean.searchEngineDefault.changed.testGetValue();
+  delete snapshot[0].timestamp;
+  Assert.deepEqual(
+    snapshot[0],
+    {
+      category: "search.engine.default",
+      name: "changed",
+      extra: {
+        change_source: "user",
+        previous_engine_id: engine1.telemetryId,
+        new_engine_id: "other-engine2",
+        new_display_name: "engine2",
+        new_load_path: "[addon]engine2@tests.mozilla.org",
+        new_submission_url: "",
+      },
+    },
+    "Should have received the correct event details"
+  );
+
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function test_setPrivateDefaultEngine() {
+  Services.telemetry.clearEvents();
+  Services.fog.testResetFOG();
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.search.separatePrivateDefault.ui.enabled", true],
+      ["browser.search.separatePrivateDefault", true],
+    ],
+  });
+
+  const engine2 = Services.search.getEngineByName("engine2");
+
+  // Set an initial default so we have a known engine.
+  await Services.search.setDefaultPrivate(
+    engine2,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+
+  Services.telemetry.clearEvents();
+  Services.fog.testResetFOG();
+
+  await setDefaultEngine(true, "engine2", "engine1");
+
+  TelemetryTestUtils.assertEvents(
+    [
+      {
+        object: "change_private",
+        value: "user",
+        extra: {
+          prev_id: engine2.telemetryId,
+          new_id: "other-engine1",
+          new_name: "engine1",
+          new_load_path: "[addon]engine1@tests.mozilla.org",
+          new_sub_url: "",
+        },
+      },
+    ],
+    { category: "search", method: "engine" }
+  );
+
+  let snapshot = await Glean.searchEnginePrivate.changed.testGetValue();
+  delete snapshot[0].timestamp;
+  console.log(snapshot);
+  Assert.deepEqual(
+    snapshot[0],
+    {
+      category: "search.engine.private",
+      name: "changed",
+      extra: {
+        change_source: "user",
+        previous_engine_id: engine2.telemetryId,
+        new_engine_id: "other-engine1",
+        new_display_name: "engine1",
+        new_load_path: "[addon]engine1@tests.mozilla.org",
+        new_submission_url: "",
+      },
+    },
+    "Should have received the correct event details"
+  );
+
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_searchFindMoreLink.js b/browser/components/preferences/tests/browser_searchFindMoreLink.js
new file mode 100644
index 0000000000..92864c9f54
--- /dev/null
+++ b/browser/components/preferences/tests/browser_searchFindMoreLink.js
@@ -0,0 +1,36 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const TEST_URL = "https://example.org/";
+
+add_setup(async () => {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.searchEnginesURL", TEST_URL]],
+  });
+});
+
+add_task(async function test_click_find_more_link() {
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+
+  let promiseNewTab = BrowserTestUtils.waitForNewTab(gBrowser);
+
+  gBrowser.selectedBrowser.contentDocument
+    .getElementById("addEngines")
+    .scrollIntoView();
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#addEngines",
+    {},
+    gBrowser.selectedBrowser.browsingContext
+  );
+
+  let tab = await promiseNewTab;
+  Assert.equal(
+    tab.linkedBrowser.documentURI.spec,
+    TEST_URL,
+    "Should have loaded the expected page"
+  );
+
+  // Close both tabs.
+  gBrowser.removeCurrentTab();
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_searchRestoreDefaults.js b/browser/components/preferences/tests/browser_searchRestoreDefaults.js
new file mode 100644
index 0000000000..80588d0cce
--- /dev/null
+++ b/browser/components/preferences/tests/browser_searchRestoreDefaults.js
@@ -0,0 +1,259 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const { SearchTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/SearchTestUtils.sys.mjs"
+);
+const { SearchUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/SearchUtils.sys.mjs"
+);
+add_task(async function test_restore_functionality() {
+  // Ensure no engines are hidden to begin with.
+  for (let engine of await Services.search.getAppProvidedEngines()) {
+    if (engine.hidden) {
+      engine.hidden = false;
+    }
+  }
+
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let restoreDefaultsButton = doc.getElementById("restoreDefaultSearchEngines");
+
+  Assert.ok(
+    restoreDefaultsButton.disabled,
+    "Should have disabled the restore default search engines button on open"
+  );
+
+  let updatedPromise = SearchTestUtils.promiseSearchNotification(
+    SearchUtils.MODIFIED_TYPE.CHANGED,
+    SearchUtils.TOPIC_ENGINE_MODIFIED
+  );
+
+  let tree = doc.querySelector("#engineList");
+  // Check for default search engines to be displayed in the engineList
+  let defaultEngines = await Services.search.getAppProvidedEngines();
+  for (let i = 0; i < defaultEngines.length; i++) {
+    let cellName = tree.view.getCellText(
+      i,
+      tree.columns.getNamedColumn("engineName")
+    );
+    if (cellName == "DuckDuckGo") {
+      tree.view.selection.select(i);
+      break;
+    }
+  }
+  doc.getElementById("removeEngineButton").click();
+  await updatedPromise;
+
+  let engine = await Services.search.getEngineByName("DuckDuckGo");
+
+  Assert.ok(engine.hidden, "Should have hidden the engine");
+  Assert.ok(
+    !restoreDefaultsButton.disabled,
+    "Should have enabled the restore default search engines button"
+  );
+
+  updatedPromise = SearchTestUtils.promiseSearchNotification(
+    SearchUtils.MODIFIED_TYPE.CHANGED,
+    SearchUtils.TOPIC_ENGINE_MODIFIED
+  );
+  restoreDefaultsButton.click();
+  await updatedPromise;
+  // Let the stack unwind so that the restore defaults button can update its
+  // state.
+  await new Promise(resolve => Services.tm.dispatchToMainThread(resolve));
+
+  Assert.ok(!engine.hidden, "Should have re-enabled the disabled engine");
+  Assert.ok(
+    restoreDefaultsButton.disabled,
+    "Should have disabled the restore default search engines button after use"
+  );
+
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function test_restoreEnabledOnOpenWithEngineHidden() {
+  let engine = await Services.search.getEngineByName("DuckDuckGo");
+  engine.hidden = true;
+
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let restoreDefaultsButton = doc.getElementById("restoreDefaultSearchEngines");
+
+  Assert.ok(
+    !restoreDefaultsButton.disabled,
+    "Should have enabled the restore default search engines button on open"
+  );
+
+  let updatedPromise = SearchTestUtils.promiseSearchNotification(
+    SearchUtils.MODIFIED_TYPE.CHANGED,
+    SearchUtils.TOPIC_ENGINE_MODIFIED
+  );
+  restoreDefaultsButton.click();
+  await updatedPromise;
+  // Let the stack unwind so that the restore defaults button can update its
+  // state.
+  await new Promise(resolve => Services.tm.dispatchToMainThread(resolve));
+
+  Assert.ok(!engine.hidden, "Should have re-enabled the disabled engine");
+  Assert.ok(
+    restoreDefaultsButton.disabled,
+    "Should have disabled the restore default search engines button after use"
+  );
+
+  gBrowser.removeCurrentTab();
+});
+
+// This removes the last two engines and then the remaining engines from top to
+// bottom, and then it restores the default engines.  See bug 1681818.
+add_task(async function test_removeOutOfOrder() {
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let restoreDefaultsButton = doc.getElementById("restoreDefaultSearchEngines");
+  Assert.ok(
+    restoreDefaultsButton.disabled,
+    "The restore-defaults button is disabled initially"
+  );
+
+  let tree = doc.querySelector("#engineList");
+  let removeEngineButton = doc.getElementById("removeEngineButton");
+  removeEngineButton.scrollIntoView();
+
+  let defaultEngines = await Services.search.getAppProvidedEngines();
+
+  // Remove the last two engines.  After each removal, the selection should move
+  // to the first local shortcut.
+  for (let i = 0; i < 2; i++) {
+    tree.view.selection.select(defaultEngines.length - i - 1);
+    let updatedPromise = SearchTestUtils.promiseSearchNotification(
+      SearchUtils.MODIFIED_TYPE.CHANGED,
+      SearchUtils.TOPIC_ENGINE_MODIFIED
+    );
+    removeEngineButton.click();
+    await updatedPromise;
+    Assert.ok(
+      removeEngineButton.disabled,
+      "The remove-engine button is disabled because a local shortcut is selected"
+    );
+    Assert.ok(
+      !restoreDefaultsButton.disabled,
+      "The restore-defaults button is enabled after removing an engine"
+    );
+  }
+
+  // Remove the remaining engines from top to bottom except for the default engine
+  // which can't be removed.
+  for (let i = 0; i < defaultEngines.length - 3; i++) {
+    tree.view.selection.select(0);
+
+    if (defaultEngines[0].name == Services.search.defaultEngine.name) {
+      tree.view.selection.select(1);
+    }
+
+    let updatedPromise = SearchTestUtils.promiseSearchNotification(
+      SearchUtils.MODIFIED_TYPE.CHANGED,
+      SearchUtils.TOPIC_ENGINE_MODIFIED
+    );
+    removeEngineButton.click();
+    await updatedPromise;
+    Assert.ok(
+      !restoreDefaultsButton.disabled,
+      "The restore-defaults button is enabled after removing an engine"
+    );
+  }
+  Assert.ok(
+    removeEngineButton.disabled,
+    "The remove-engine button is disabled because only one engine remains"
+  );
+
+  // Click the restore-defaults button.
+  let updatedPromise = SearchTestUtils.promiseSearchNotification(
+    SearchUtils.MODIFIED_TYPE.CHANGED,
+    SearchUtils.TOPIC_ENGINE_MODIFIED
+  );
+  restoreDefaultsButton.click();
+  await updatedPromise;
+
+  // Wait for the restore-defaults button to update its state.
+  await TestUtils.waitForCondition(
+    () => restoreDefaultsButton.disabled,
+    "Waiting for the restore-defaults button to become disabled"
+  );
+
+  Assert.ok(
+    restoreDefaultsButton.disabled,
+    "The restore-defaults button is disabled after restoring defaults"
+  );
+  Assert.equal(
+    tree.view.rowCount,
+    defaultEngines.length + UrlbarUtils.LOCAL_SEARCH_MODES.length,
+    "All engines are restored"
+  );
+
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function test_removeAndRestoreMultiple() {
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let restoreDefaultsButton = doc.getElementById("restoreDefaultSearchEngines");
+  let tree = doc.querySelector("#engineList");
+  let removeEngineButton = doc.getElementById("removeEngineButton");
+  removeEngineButton.scrollIntoView();
+
+  let defaultEngines = await Services.search.getAppProvidedEngines();
+
+  // Remove the second and fourth engines.
+  for (let i = 0; i < 2; i++) {
+    tree.view.selection.select(i * 2 + 1);
+    let updatedPromise = SearchTestUtils.promiseSearchNotification(
+      SearchUtils.MODIFIED_TYPE.CHANGED,
+      SearchUtils.TOPIC_ENGINE_MODIFIED
+    );
+    removeEngineButton.click();
+    await updatedPromise;
+  }
+
+  // Click the restore-defaults button.
+  let updatedPromise = SearchTestUtils.promiseSearchNotification(
+    SearchUtils.MODIFIED_TYPE.CHANGED,
+    SearchUtils.TOPIC_ENGINE_MODIFIED
+  );
+  restoreDefaultsButton.click();
+  await updatedPromise;
+
+  // Remove the third engine.
+  tree.view.selection.select(3);
+  updatedPromise = SearchTestUtils.promiseSearchNotification(
+    SearchUtils.MODIFIED_TYPE.CHANGED,
+    SearchUtils.TOPIC_ENGINE_MODIFIED
+  );
+  removeEngineButton.click();
+  await updatedPromise;
+
+  // Now restore again.
+  updatedPromise = SearchTestUtils.promiseSearchNotification(
+    SearchUtils.MODIFIED_TYPE.CHANGED,
+    SearchUtils.TOPIC_ENGINE_MODIFIED
+  );
+  restoreDefaultsButton.click();
+  await updatedPromise;
+
+  // Wait for the restore-defaults button to update its state.
+  await TestUtils.waitForCondition(
+    () => restoreDefaultsButton.disabled,
+    "Waiting for the restore-defaults button to become disabled"
+  );
+
+  Assert.equal(
+    tree.view.rowCount,
+    defaultEngines.length + UrlbarUtils.LOCAL_SEARCH_MODES.length,
+    "Should have the correct amount of engines"
+  );
+
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_searchScroll.js b/browser/components/preferences/tests/browser_searchScroll.js
new file mode 100644
index 0000000000..ef3af646e9
--- /dev/null
+++ b/browser/components/preferences/tests/browser_searchScroll.js
@@ -0,0 +1,66 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/gfx/layers/apz/test/mochitest/apz_test_native_event_utils.js",
+  this
+);
+
+const { AddonTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/AddonTestUtils.sys.mjs"
+);
+const { SearchTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/SearchTestUtils.sys.mjs"
+);
+const { SearchUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/SearchUtils.sys.mjs"
+);
+
+AddonTestUtils.initMochitest(this);
+SearchTestUtils.init(this);
+
+add_setup(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["dom.w3c_touch_events.enabled", 0]],
+  });
+});
+
+add_task(async function test_scroll() {
+  info("Open preferences page for search");
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+
+  const doc = gBrowser.selectedBrowser.contentDocument;
+  const tree = doc.querySelector("#engineList");
+
+  info("Add engines to make the tree scrollable");
+  for (let i = 0, n = parseInt(tree.getAttribute("rows")); i < n; i++) {
+    let extension = await SearchTestUtils.installSearchExtension({
+      id: `${i}@tests.mozilla.org`,
+      name: `example${i}`,
+      version: "1.0",
+      keyword: `example${i}`,
+    });
+    await AddonTestUtils.waitForSearchProviderStartup(extension);
+  }
+
+  info("Make tree element move into viewport");
+  const mainContent = doc.querySelector(".main-content");
+  const readyForScrollIntoView = new Promise(r => {
+    mainContent.addEventListener("scroll", r, { once: true });
+  });
+  tree.scrollIntoView();
+  await readyForScrollIntoView;
+
+  const previousScroll = mainContent.scrollTop;
+
+  await promiseMoveMouseAndScrollWheelOver(tree, 1, 1, false);
+
+  Assert.equal(
+    previousScroll,
+    mainContent.scrollTop,
+    "Container element does not scroll"
+  );
+
+  info("Clean up");
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_searchShowSuggestionsFirst.js b/browser/components/preferences/tests/browser_searchShowSuggestionsFirst.js
new file mode 100644
index 0000000000..cd7f5528f1
--- /dev/null
+++ b/browser/components/preferences/tests/browser_searchShowSuggestionsFirst.js
@@ -0,0 +1,244 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const MAIN_PREF = "browser.search.suggest.enabled";
+const URLBAR_PREF = "browser.urlbar.suggest.searches";
+const FIRST_PREF = "browser.urlbar.showSearchSuggestionsFirst";
+const SEARCHBAR_PREF = "browser.search.widget.inNavBar";
+const FIRST_CHECKBOX_ID = "showSearchSuggestionsFirstCheckbox";
+
+add_setup(async function () {
+  // Make sure the main and urlbar suggestion prefs are enabled.
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [MAIN_PREF, true],
+      [URLBAR_PREF, true],
+    ],
+  });
+});
+
+// Open preferences with search suggestions shown first (the default).
+add_task(async function openWithSearchSuggestionsShownFirst() {
+  // Initially the pref should be true so search suggestions are shown first.
+  Assert.ok(
+    Services.prefs.getBoolPref(FIRST_PREF),
+    "Pref should be true initially"
+  );
+
+  // Open preferences.  The checkbox should be checked.
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let checkbox = doc.getElementById(FIRST_CHECKBOX_ID);
+  Assert.ok(checkbox.checked, "Checkbox should be checked");
+  Assert.ok(!checkbox.disabled, "Checkbox should be enabled");
+
+  // Uncheck the checkbox.
+  checkbox.checked = false;
+  checkbox.doCommand();
+
+  // The pref should now be false so that history is shown first.
+  Assert.ok(
+    !Services.prefs.getBoolPref(FIRST_PREF),
+    "Pref should now be false to show history first"
+  );
+
+  // Make sure the checkbox state didn't change.
+  Assert.ok(!checkbox.checked, "Checkbox should remain unchecked");
+  Assert.ok(!checkbox.disabled, "Checkbox should remain enabled");
+
+  // Clear the pref.
+  Services.prefs.clearUserPref(FIRST_PREF);
+
+  // The checkbox should have become checked again.
+  Assert.ok(
+    checkbox.checked,
+    "Checkbox should become checked after clearing pref"
+  );
+  Assert.ok(
+    !checkbox.disabled,
+    "Checkbox should remain enabled after clearing pref"
+  );
+
+  // Clean up.
+  gBrowser.removeCurrentTab();
+});
+
+// Open preferences with history shown first.
+add_task(async function openWithHistoryShownFirst() {
+  // Set the pref to show history first.
+  Services.prefs.setBoolPref(FIRST_PREF, false);
+
+  // Open preferences.  The checkbox should be unchecked.
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let checkbox = doc.getElementById(FIRST_CHECKBOX_ID);
+  Assert.ok(!checkbox.checked, "Checkbox should be unchecked");
+  Assert.ok(!checkbox.disabled, "Checkbox should be enabled");
+
+  // Check the checkbox.
+  checkbox.checked = true;
+  checkbox.doCommand();
+
+  // Make sure the checkbox state didn't change.
+  Assert.ok(checkbox.checked, "Checkbox should remain checked");
+  Assert.ok(!checkbox.disabled, "Checkbox should remain enabled");
+
+  // The pref should now be true so that search suggestions are shown first.
+  Assert.ok(
+    Services.prefs.getBoolPref(FIRST_PREF),
+    "Pref should now be true to show search suggestions first"
+  );
+
+  // Set the pref to false again.
+  Services.prefs.setBoolPref(FIRST_PREF, false);
+
+  // The checkbox should have become unchecked again.
+  Assert.ok(
+    !checkbox.checked,
+    "Checkbox should become unchecked after setting pref to false"
+  );
+  Assert.ok(
+    !checkbox.disabled,
+    "Checkbox should remain enabled after setting pref to false"
+  );
+
+  // Clean up.
+  gBrowser.removeCurrentTab();
+  Services.prefs.clearUserPref(FIRST_PREF);
+});
+
+// Checks how the show-suggestions-first pref and checkbox reacts to updates to
+// URLBAR_PREF and MAIN_PREF.
+add_task(async function superprefInteraction() {
+  // Initially the pref should be true so search suggestions are shown first.
+  Assert.ok(
+    Services.prefs.getBoolPref(FIRST_PREF),
+    "Pref should be true initially"
+  );
+
+  // Open preferences.  The checkbox should be checked.
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let checkbox = doc.getElementById(FIRST_CHECKBOX_ID);
+  Assert.ok(checkbox.checked, "Checkbox should be checked");
+  Assert.ok(!checkbox.disabled, "Checkbox should be enabled");
+
+  Services.prefs.setBoolPref(SEARCHBAR_PREF, true);
+
+  // Two superior prefs control the show-suggestion-first pref: URLBAR_PREF and
+  // MAIN_PREF.  Toggle each and make sure the show-suggestion-first checkbox
+  // reacts appropriately.
+  for (let superiorPref of [URLBAR_PREF, MAIN_PREF]) {
+    info(`Testing superior pref ${superiorPref}`);
+
+    // Set the superior pref to false.
+    Services.prefs.setBoolPref(superiorPref, false);
+
+    // The pref should remain true.
+    Assert.ok(
+      Services.prefs.getBoolPref(FIRST_PREF),
+      "Pref should remain true"
+    );
+
+    // The checkbox should have become unchecked and disabled.
+    Assert.ok(
+      !checkbox.checked,
+      "Checkbox should become unchecked after disabling urlbar suggestions"
+    );
+    Assert.ok(
+      checkbox.disabled,
+      "Checkbox should become disabled after disabling urlbar suggestions"
+    );
+
+    // Set the superior pref to true.
+    Services.prefs.setBoolPref(superiorPref, true);
+
+    // The pref should remain true.
+    Assert.ok(
+      Services.prefs.getBoolPref(FIRST_PREF),
+      "Pref should remain true"
+    );
+
+    // The checkbox should have become checked and enabled again.
+    Assert.ok(
+      checkbox.checked,
+      "Checkbox should become checked after re-enabling urlbar suggestions"
+    );
+    Assert.ok(
+      !checkbox.disabled,
+      "Checkbox should become enabled after re-enabling urlbar suggestions"
+    );
+
+    // Set the pref to false.
+    Services.prefs.setBoolPref(FIRST_PREF, false);
+
+    // The checkbox should have become unchecked.
+    Assert.ok(
+      !checkbox.checked,
+      "Checkbox should become unchecked after setting pref to false"
+    );
+    Assert.ok(
+      !checkbox.disabled,
+      "Checkbox should remain enabled after setting pref to false"
+    );
+
+    // Set the superior pref to false again.
+    Services.prefs.setBoolPref(superiorPref, false);
+
+    // The pref should remain false.
+    Assert.ok(
+      !Services.prefs.getBoolPref(FIRST_PREF),
+      "Pref should remain false"
+    );
+
+    // The checkbox should remain unchecked and become disabled.
+    Assert.ok(
+      !checkbox.checked,
+      "Checkbox should remain unchecked after disabling urlbar suggestions"
+    );
+    Assert.ok(
+      checkbox.disabled,
+      "Checkbox should become disabled after disabling urlbar suggestions"
+    );
+
+    // Set the superior pref to true.
+    Services.prefs.setBoolPref(superiorPref, true);
+
+    // The pref should remain false.
+    Assert.ok(
+      !Services.prefs.getBoolPref(FIRST_PREF),
+      "Pref should remain false"
+    );
+
+    // The checkbox should remain unchecked and become enabled.
+    Assert.ok(
+      !checkbox.checked,
+      "Checkbox should remain unchecked after re-enabling urlbar suggestions"
+    );
+    Assert.ok(
+      !checkbox.disabled,
+      "Checkbox should become enabled after re-enabling urlbar suggestions"
+    );
+
+    // Finally, set the pref back to true.
+    Services.prefs.setBoolPref(FIRST_PREF, true);
+
+    // The checkbox should have become checked.
+    Assert.ok(
+      checkbox.checked,
+      "Checkbox should become checked after setting pref back to true"
+    );
+    Assert.ok(
+      !checkbox.disabled,
+      "Checkbox should remain enabled after setting pref back to true"
+    );
+  }
+
+  // Clean up.
+  gBrowser.removeCurrentTab();
+
+  Services.prefs.clearUserPref(FIRST_PREF);
+  Services.prefs.clearUserPref(URLBAR_PREF);
+  Services.prefs.clearUserPref(MAIN_PREF);
+  Services.prefs.clearUserPref(SEARCHBAR_PREF);
+});
diff --git a/browser/components/preferences/tests/browser_search_firefoxSuggest.js b/browser/components/preferences/tests/browser_search_firefoxSuggest.js
new file mode 100644
index 0000000000..eb4dc1880a
--- /dev/null
+++ b/browser/components/preferences/tests/browser_search_firefoxSuggest.js
@@ -0,0 +1,628 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// This tests the Search pane's Firefox Suggest UI.
+
+"use strict";
+
+ChromeUtils.defineESModuleGetters(this, {
+  QuickSuggest: "resource:///modules/QuickSuggest.sys.mjs",
+});
+
+ChromeUtils.defineLazyGetter(this, "QuickSuggestTestUtils", () => {
+  const { QuickSuggestTestUtils: module } = ChromeUtils.importESModule(
+    "resource://testing-common/QuickSuggestTestUtils.sys.mjs"
+  );
+  module.init(this);
+  return module;
+});
+
+const CONTAINER_ID = "firefoxSuggestContainer";
+const NONSPONSORED_CHECKBOX_ID = "firefoxSuggestNonsponsored";
+const SPONSORED_CHECKBOX_ID = "firefoxSuggestSponsored";
+const DATA_COLLECTION_TOGGLE_ID = "firefoxSuggestDataCollectionSearchToggle";
+const INFO_BOX_ID = "firefoxSuggestInfoBox";
+const INFO_TEXT_ID = "firefoxSuggestInfoText";
+const LEARN_MORE_CLASS = "firefoxSuggestLearnMore";
+const BUTTON_RESTORE_DISMISSED_ID = "restoreDismissedSuggestions";
+const PREF_URLBAR_QUICKSUGGEST_BLOCKLIST =
+  "browser.urlbar.quicksuggest.blockedDigests";
+const PREF_URLBAR_WEATHER_USER_ENABLED = "browser.urlbar.suggest.weather";
+
+// Maps text element IDs to `{ enabled, disabled }`, where `enabled` is the
+// expected l10n ID when the Firefox Suggest feature is enabled, and `disabled`
+// is when disabled.
+const EXPECTED_L10N_IDS = {
+  locationBarGroupHeader: {
+    enabled: "addressbar-header-firefox-suggest",
+    disabled: "addressbar-header",
+  },
+  locationBarSuggestionLabel: {
+    enabled: "addressbar-suggest-firefox-suggest",
+    disabled: "addressbar-suggest",
+  },
+};
+
+// This test can take a while due to the many permutations some of these tasks
+// run through, so request a longer timeout.
+requestLongerTimeout(10);
+
+// The following tasks check the visibility of the Firefox Suggest UI based on
+// the value of the feature pref. See doVisibilityTest().
+
+add_task(async function historyToOffline() {
+  await doVisibilityTest({
+    initialScenario: "history",
+    initialExpectedVisibility: false,
+    newScenario: "offline",
+    newExpectedVisibility: true,
+  });
+});
+
+add_task(async function historyToOnline() {
+  await doVisibilityTest({
+    initialScenario: "history",
+    initialExpectedVisibility: false,
+    newScenario: "online",
+    newExpectedVisibility: true,
+  });
+});
+
+add_task(async function offlineToHistory() {
+  await doVisibilityTest({
+    initialScenario: "offline",
+    initialExpectedVisibility: true,
+    newScenario: "history",
+    newExpectedVisibility: false,
+  });
+});
+
+add_task(async function offlineToOnline() {
+  await doVisibilityTest({
+    initialScenario: "offline",
+    initialExpectedVisibility: true,
+    newScenario: "online",
+    newExpectedVisibility: true,
+  });
+});
+
+add_task(async function onlineToHistory() {
+  await doVisibilityTest({
+    initialScenario: "online",
+    initialExpectedVisibility: true,
+    newScenario: "history",
+    newExpectedVisibility: false,
+  });
+});
+
+add_task(async function onlineToOffline() {
+  await doVisibilityTest({
+    initialScenario: "online",
+    initialExpectedVisibility: true,
+    newScenario: "offline",
+    newExpectedVisibility: true,
+  });
+});
+
+/**
+ * Runs a test that checks the visibility of the Firefox Suggest preferences UI
+ * based on scenario pref.
+ *
+ * @param {string} initialScenario
+ *   The initial scenario.
+ * @param {boolean} initialExpectedVisibility
+ *   Whether the UI should be visible with the initial scenario.
+ * @param {string} newScenario
+ *   The updated scenario.
+ * @param {boolean} newExpectedVisibility
+ *   Whether the UI should be visible after setting the new scenario.
+ */
+async function doVisibilityTest({
+  initialScenario,
+  initialExpectedVisibility,
+  newScenario,
+  newExpectedVisibility,
+}) {
+  info(
+    "Running visibility test: " +
+      JSON.stringify(
+        {
+          initialScenario,
+          initialExpectedVisibility,
+          newScenario,
+          newExpectedVisibility,
+        },
+        null,
+        2
+      )
+  );
+
+  // Set the initial scenario.
+  await QuickSuggestTestUtils.setScenario(initialScenario);
+
+  Assert.equal(
+    Services.prefs.getBoolPref("browser.urlbar.quicksuggest.enabled"),
+    initialExpectedVisibility,
+    `quicksuggest.enabled is correct after setting initial scenario, initialExpectedVisibility=${initialExpectedVisibility}`
+  );
+
+  // Open prefs and check the initial visibility.
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let container = doc.getElementById(CONTAINER_ID);
+  Assert.equal(
+    BrowserTestUtils.isVisible(container),
+    initialExpectedVisibility,
+    `The container has the expected initial visibility, initialExpectedVisibility=${initialExpectedVisibility}`
+  );
+
+  // Check the text elements' l10n IDs.
+  for (let [id, { enabled, disabled }] of Object.entries(EXPECTED_L10N_IDS)) {
+    Assert.equal(
+      doc.getElementById(id).dataset.l10nId,
+      initialExpectedVisibility ? enabled : disabled,
+      `Initial l10n ID for element with ID ${id}, initialExpectedVisibility=${initialExpectedVisibility}`
+    );
+  }
+
+  // Set the new scenario.
+  await QuickSuggestTestUtils.setScenario(newScenario);
+
+  Assert.equal(
+    Services.prefs.getBoolPref("browser.urlbar.quicksuggest.enabled"),
+    newExpectedVisibility,
+    `quicksuggest.enabled is correct after setting new scenario, newExpectedVisibility=${newExpectedVisibility}`
+  );
+
+  // Check visibility again.
+  Assert.equal(
+    BrowserTestUtils.isVisible(container),
+    newExpectedVisibility,
+    `The container has the expected visibility after setting new scenario, newExpectedVisibility=${newExpectedVisibility}`
+  );
+
+  // Check the text elements' l10n IDs again.
+  for (let [id, { enabled, disabled }] of Object.entries(EXPECTED_L10N_IDS)) {
+    Assert.equal(
+      doc.getElementById(id).dataset.l10nId,
+      newExpectedVisibility ? enabled : disabled,
+      `New l10n ID for element with ID ${id}, newExpectedVisibility=${newExpectedVisibility}`
+    );
+  }
+
+  // Clean up.
+  gBrowser.removeCurrentTab();
+  await QuickSuggestTestUtils.setScenario(null);
+}
+
+// Verifies all 8 states of the 3 checkboxes and their related info box states.
+add_task(async function checkboxesAndInfoBox() {
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+
+  // suggest.quicksuggest.nonsponsored = true
+  // suggest.quicksuggest.sponsored = true
+  // quicksuggest.dataCollection.enabled = true
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.suggest.quicksuggest.nonsponsored", true],
+      ["browser.urlbar.suggest.quicksuggest.sponsored", true],
+      ["browser.urlbar.quicksuggest.dataCollection.enabled", true],
+    ],
+  });
+  assertPrefUIState({
+    [NONSPONSORED_CHECKBOX_ID]: true,
+    [SPONSORED_CHECKBOX_ID]: true,
+    [DATA_COLLECTION_TOGGLE_ID]: true,
+  });
+  await assertInfoBox("addressbar-firefox-suggest-info-all");
+  await SpecialPowers.popPrefEnv();
+
+  // suggest.quicksuggest.nonsponsored = true
+  // suggest.quicksuggest.sponsored = true
+  // quicksuggest.dataCollection.enabled = false
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.suggest.quicksuggest.nonsponsored", true],
+      ["browser.urlbar.suggest.quicksuggest.sponsored", true],
+      ["browser.urlbar.quicksuggest.dataCollection.enabled", false],
+    ],
+  });
+  assertPrefUIState({
+    [NONSPONSORED_CHECKBOX_ID]: true,
+    [SPONSORED_CHECKBOX_ID]: true,
+    [DATA_COLLECTION_TOGGLE_ID]: false,
+  });
+  await assertInfoBox("addressbar-firefox-suggest-info-nonsponsored-sponsored");
+  await SpecialPowers.popPrefEnv();
+
+  // suggest.quicksuggest.nonsponsored = true
+  // suggest.quicksuggest.sponsored = false
+  // quicksuggest.dataCollection.enabled = true
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.suggest.quicksuggest.nonsponsored", true],
+      ["browser.urlbar.suggest.quicksuggest.sponsored", false],
+      ["browser.urlbar.quicksuggest.dataCollection.enabled", true],
+    ],
+  });
+  assertPrefUIState({
+    [NONSPONSORED_CHECKBOX_ID]: true,
+    [SPONSORED_CHECKBOX_ID]: false,
+    [DATA_COLLECTION_TOGGLE_ID]: true,
+  });
+  await assertInfoBox("addressbar-firefox-suggest-info-nonsponsored-data");
+  await SpecialPowers.popPrefEnv();
+
+  // suggest.quicksuggest.nonsponsored = true
+  // suggest.quicksuggest.sponsored = false
+  // quicksuggest.dataCollection.enabled = false
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.suggest.quicksuggest.nonsponsored", true],
+      ["browser.urlbar.suggest.quicksuggest.sponsored", false],
+      ["browser.urlbar.quicksuggest.dataCollection.enabled", false],
+    ],
+  });
+  assertPrefUIState({
+    [NONSPONSORED_CHECKBOX_ID]: true,
+    [SPONSORED_CHECKBOX_ID]: false,
+    [DATA_COLLECTION_TOGGLE_ID]: false,
+  });
+  await assertInfoBox("addressbar-firefox-suggest-info-nonsponsored");
+  await SpecialPowers.popPrefEnv();
+
+  // suggest.quicksuggest.nonsponsored = false
+  // suggest.quicksuggest.sponsored = true
+  // quicksuggest.dataCollection.enabled = true
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.suggest.quicksuggest.nonsponsored", false],
+      ["browser.urlbar.suggest.quicksuggest.sponsored", true],
+      ["browser.urlbar.quicksuggest.dataCollection.enabled", true],
+    ],
+  });
+  assertPrefUIState({
+    [NONSPONSORED_CHECKBOX_ID]: false,
+    [SPONSORED_CHECKBOX_ID]: true,
+    [DATA_COLLECTION_TOGGLE_ID]: true,
+  });
+  await assertInfoBox("addressbar-firefox-suggest-info-sponsored-data");
+  await SpecialPowers.popPrefEnv();
+
+  // suggest.quicksuggest.nonsponsored = false
+  // suggest.quicksuggest.sponsored = true
+  // quicksuggest.dataCollection.enabled = false
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.suggest.quicksuggest.nonsponsored", false],
+      ["browser.urlbar.suggest.quicksuggest.sponsored", true],
+      ["browser.urlbar.quicksuggest.dataCollection.enabled", false],
+    ],
+  });
+  assertPrefUIState({
+    [NONSPONSORED_CHECKBOX_ID]: false,
+    [SPONSORED_CHECKBOX_ID]: true,
+    [DATA_COLLECTION_TOGGLE_ID]: false,
+  });
+  await assertInfoBox("addressbar-firefox-suggest-info-sponsored");
+  await SpecialPowers.popPrefEnv();
+
+  // suggest.quicksuggest.nonsponsored = false
+  // suggest.quicksuggest.sponsored = false
+  // quicksuggest.dataCollection.enabled = true
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.suggest.quicksuggest.nonsponsored", false],
+      ["browser.urlbar.suggest.quicksuggest.sponsored", false],
+      ["browser.urlbar.quicksuggest.dataCollection.enabled", true],
+    ],
+  });
+  assertPrefUIState({
+    [NONSPONSORED_CHECKBOX_ID]: false,
+    [SPONSORED_CHECKBOX_ID]: false,
+    [DATA_COLLECTION_TOGGLE_ID]: true,
+  });
+  await assertInfoBox("addressbar-firefox-suggest-info-data");
+  await SpecialPowers.popPrefEnv();
+
+  // suggest.quicksuggest.nonsponsored = false
+  // suggest.quicksuggest.sponsored = false
+  // quicksuggest.dataCollection.enabled = false
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.suggest.quicksuggest.nonsponsored", false],
+      ["browser.urlbar.suggest.quicksuggest.sponsored", false],
+      ["browser.urlbar.quicksuggest.dataCollection.enabled", false],
+    ],
+  });
+  assertPrefUIState({
+    [NONSPONSORED_CHECKBOX_ID]: false,
+    [SPONSORED_CHECKBOX_ID]: false,
+    [DATA_COLLECTION_TOGGLE_ID]: false,
+  });
+  await assertInfoBox(null);
+  await SpecialPowers.popPrefEnv();
+
+  gBrowser.removeCurrentTab();
+});
+
+// Clicks each of the checkboxes and toggles and makes sure the prefs and info box are updated.
+add_task(async function clickCheckboxesOrToggle() {
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let addressBarSection = doc.getElementById("locationBarGroup");
+  addressBarSection.scrollIntoView();
+
+  async function clickElement(id, eventName) {
+    let element = doc.getElementById(id);
+    let changed = BrowserTestUtils.waitForEvent(element, eventName);
+
+    if (eventName == "toggle") {
+      element = element.buttonEl;
+    }
+
+    EventUtils.synthesizeMouseAtCenter(
+      element,
+      {},
+      gBrowser.selectedBrowser.contentWindow
+    );
+    await changed;
+  }
+
+  // Set initial state.
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.suggest.quicksuggest.nonsponsored", true],
+      ["browser.urlbar.suggest.quicksuggest.sponsored", true],
+      ["browser.urlbar.quicksuggest.dataCollection.enabled", true],
+    ],
+  });
+  assertPrefUIState({
+    [NONSPONSORED_CHECKBOX_ID]: true,
+    [SPONSORED_CHECKBOX_ID]: true,
+    [DATA_COLLECTION_TOGGLE_ID]: true,
+  });
+  await assertInfoBox("addressbar-firefox-suggest-info-all");
+
+  // non-sponsored checkbox
+  await clickElement(NONSPONSORED_CHECKBOX_ID, "command");
+  Assert.ok(
+    !Services.prefs.getBoolPref(
+      "browser.urlbar.suggest.quicksuggest.nonsponsored"
+    ),
+    "suggest.quicksuggest.nonsponsored is false after clicking non-sponsored checkbox"
+  );
+  assertPrefUIState({
+    [NONSPONSORED_CHECKBOX_ID]: false,
+    [SPONSORED_CHECKBOX_ID]: true,
+    [DATA_COLLECTION_TOGGLE_ID]: true,
+  });
+  await assertInfoBox("addressbar-firefox-suggest-info-sponsored-data");
+
+  // sponsored checkbox
+  await clickElement(SPONSORED_CHECKBOX_ID, "command");
+  Assert.ok(
+    !Services.prefs.getBoolPref(
+      "browser.urlbar.suggest.quicksuggest.nonsponsored"
+    ),
+    "suggest.quicksuggest.nonsponsored remains false after clicking sponsored checkbox"
+  );
+  Assert.ok(
+    !Services.prefs.getBoolPref(
+      "browser.urlbar.suggest.quicksuggest.sponsored"
+    ),
+    "suggest.quicksuggest.sponsored is false after clicking sponsored checkbox"
+  );
+  assertPrefUIState({
+    [NONSPONSORED_CHECKBOX_ID]: false,
+    [SPONSORED_CHECKBOX_ID]: false,
+    [DATA_COLLECTION_TOGGLE_ID]: true,
+  });
+  await assertInfoBox("addressbar-firefox-suggest-info-data");
+
+  // data collection toggle
+  await clickElement(DATA_COLLECTION_TOGGLE_ID, "toggle");
+  Assert.ok(
+    !Services.prefs.getBoolPref(
+      "browser.urlbar.suggest.quicksuggest.nonsponsored"
+    ),
+    "suggest.quicksuggest.nonsponsored remains false after clicking sponsored checkbox"
+  );
+  Assert.ok(
+    !Services.prefs.getBoolPref(
+      "browser.urlbar.suggest.quicksuggest.sponsored"
+    ),
+    "suggest.quicksuggest.sponsored remains false after clicking data collection toggle"
+  );
+  Assert.ok(
+    !Services.prefs.getBoolPref(
+      "browser.urlbar.quicksuggest.dataCollection.enabled"
+    ),
+    "quicksuggest.dataCollection.enabled is false after clicking data collection toggle"
+  );
+  assertPrefUIState({
+    [NONSPONSORED_CHECKBOX_ID]: false,
+    [SPONSORED_CHECKBOX_ID]: false,
+    [DATA_COLLECTION_TOGGLE_ID]: false,
+  });
+  await assertInfoBox(null);
+
+  gBrowser.removeCurrentTab();
+  await SpecialPowers.popPrefEnv();
+});
+
+// Clicks the learn-more links and checks the help page is opened in a new tab.
+add_task(async function clickLearnMore() {
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let addressBarSection = doc.getElementById("locationBarGroup");
+  addressBarSection.scrollIntoView();
+
+  // Set initial state so that the info box and learn more link are shown.
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.suggest.quicksuggest.nonsponsored", true],
+      ["browser.urlbar.suggest.quicksuggest.sponsored", true],
+      ["browser.urlbar.quicksuggest.dataCollection.enabled", true],
+    ],
+  });
+  await assertInfoBox("addressbar-firefox-suggest-info-all");
+
+  let learnMoreLinks = doc.querySelectorAll(
+    "#locationBarGroup ." + LEARN_MORE_CLASS
+  );
+  Assert.equal(
+    learnMoreLinks.length,
+    3,
+    "Expected number of learn-more links are present"
+  );
+  for (let link of learnMoreLinks) {
+    Assert.ok(
+      BrowserTestUtils.isVisible(link),
+      "Learn-more link is visible: " + link.id
+    );
+  }
+
+  let prefsTab = gBrowser.selectedTab;
+  for (let link of learnMoreLinks) {
+    let tabPromise = BrowserTestUtils.waitForNewTab(
+      gBrowser,
+      QuickSuggest.HELP_URL
+    );
+    info("Clicking learn-more link: " + link.id);
+    Assert.ok(link.id, "Sanity check: Learn-more link has an ID");
+    await BrowserTestUtils.synthesizeMouseAtCenter(
+      "#" + link.id,
+      {},
+      gBrowser.selectedBrowser
+    );
+    info("Waiting for help page to load in a new tab");
+    await tabPromise;
+    gBrowser.removeCurrentTab();
+    gBrowser.selectedTab = prefsTab;
+  }
+
+  gBrowser.removeCurrentTab();
+  await SpecialPowers.popPrefEnv();
+});
+
+// Tests the "Restore" button for dismissed suggestions.
+add_task(async function restoreDismissedSuggestions() {
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let addressBarSection = doc.getElementById("locationBarGroup");
+  addressBarSection.scrollIntoView();
+
+  let button = doc.getElementById(BUTTON_RESTORE_DISMISSED_ID);
+  Assert.equal(
+    Services.prefs.getStringPref(PREF_URLBAR_QUICKSUGGEST_BLOCKLIST, ""),
+    "",
+    "Block list is empty initially"
+  );
+  Assert.ok(
+    Services.prefs.getBoolPref(PREF_URLBAR_WEATHER_USER_ENABLED),
+    "Weather suggestions are enabled initially"
+  );
+  Assert.ok(button.disabled, "Restore button is disabled initially.");
+
+  await QuickSuggest.blockedSuggestions.add("https://example.com/");
+  Assert.notEqual(
+    Services.prefs.getStringPref(PREF_URLBAR_QUICKSUGGEST_BLOCKLIST, ""),
+    "",
+    "Block list is non-empty after adding URL"
+  );
+  Assert.ok(!button.disabled, "Restore button is enabled after blocking URL.");
+  button.click();
+  Assert.equal(
+    Services.prefs.getStringPref(PREF_URLBAR_QUICKSUGGEST_BLOCKLIST, ""),
+    "",
+    "Block list is empty clicking Restore button"
+  );
+  Assert.ok(button.disabled, "Restore button is disabled after clicking it.");
+
+  Services.prefs.setBoolPref(PREF_URLBAR_WEATHER_USER_ENABLED, false);
+  Assert.ok(
+    !button.disabled,
+    "Restore button is enabled after disabling weather suggestions."
+  );
+  button.click();
+  Assert.ok(
+    Services.prefs.getBoolPref(PREF_URLBAR_WEATHER_USER_ENABLED),
+    "Weather suggestions are enabled after clicking Restore button"
+  );
+  Assert.ok(
+    button.disabled,
+    "Restore button is disabled after clicking it again."
+  );
+
+  gBrowser.removeCurrentTab();
+  await SpecialPowers.popPrefEnv();
+});
+
+/**
+ * Verifies the state of pref related to checkboxes or toggles.
+ *
+ * @param {object} stateByElementID
+ *   Maps checkbox or toggle element IDs to booleans. Each boolean
+ *   is the expected state of the corresponding ID.
+ */
+function assertPrefUIState(stateByElementID) {
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let container = doc.getElementById(CONTAINER_ID);
+  let attr;
+  Assert.ok(BrowserTestUtils.isVisible(container), "The container is visible");
+  for (let [id, state] of Object.entries(stateByElementID)) {
+    let element = doc.getElementById(id);
+    if (element.tagName === "checkbox") {
+      attr = "checked";
+    } else if (element.tagName === "html:moz-toggle") {
+      attr = "pressed";
+    }
+    Assert.equal(element[attr], state, "Expected state for ID: " + id);
+  }
+}
+
+/**
+ * Verifies the state of the info box.
+ *
+ * @param {string} expectedL10nID
+ *   The l10n ID of the string that should be visible in the info box, null if
+ *   the info box should be hidden.
+ */
+async function assertInfoBox(expectedL10nID) {
+  info("Checking info box with expected l10n ID: " + expectedL10nID);
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let infoBox = doc.getElementById(INFO_BOX_ID);
+  await TestUtils.waitForCondition(
+    () => BrowserTestUtils.isVisible(infoBox) == !!expectedL10nID,
+    "Waiting for expected info box visibility: " + !!expectedL10nID
+  );
+
+  let infoIcon = infoBox.querySelector(".info-icon");
+  Assert.equal(
+    BrowserTestUtils.isVisible(infoIcon),
+    !!expectedL10nID,
+    "The info icon is visible iff a description should be shown"
+  );
+
+  let learnMore = infoBox.querySelector("." + LEARN_MORE_CLASS);
+  Assert.ok(learnMore, "Found the info box learn more link");
+  Assert.equal(
+    BrowserTestUtils.isVisible(learnMore),
+    !!expectedL10nID,
+    "The info box learn more link is visible iff a description should be shown"
+  );
+
+  if (expectedL10nID) {
+    let infoText = doc.getElementById(INFO_TEXT_ID);
+    Assert.equal(
+      infoText.dataset.l10nId,
+      expectedL10nID,
+      "Info text has expected l10n ID"
+    );
+  }
+}
diff --git a/browser/components/preferences/tests/browser_search_no_results_change_category.js b/browser/components/preferences/tests/browser_search_no_results_change_category.js
new file mode 100644
index 0000000000..131492632e
--- /dev/null
+++ b/browser/components/preferences/tests/browser_search_no_results_change_category.js
@@ -0,0 +1,44 @@
+"use strict";
+
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.search", true]],
+  });
+});
+
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+
+  let searchInput = gBrowser.contentDocument.getElementById("searchInput");
+  is(
+    searchInput,
+    gBrowser.contentDocument.activeElement.closest("#searchInput"),
+    "Search input should be focused when visiting preferences"
+  );
+  let query = "ffff____noresults____ffff";
+  let searchCompletedPromise = BrowserTestUtils.waitForEvent(
+    gBrowser.contentWindow,
+    "PreferencesSearchCompleted",
+    evt => evt.detail == query
+  );
+  EventUtils.sendString(query);
+  await searchCompletedPromise;
+
+  let noResultsEl = gBrowser.contentDocument.querySelector(
+    "#no-results-message"
+  );
+  is_element_visible(
+    noResultsEl,
+    "Should be reporting no results for this query"
+  );
+
+  await gBrowser.contentWindow.gotoPref("panePrivacy");
+  is_element_hidden(
+    noResultsEl,
+    "Should not be showing the 'no results' message after selecting a category"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_search_quickactions.js b/browser/components/preferences/tests/browser_search_quickactions.js
new file mode 100644
index 0000000000..db938035ae
--- /dev/null
+++ b/browser/components/preferences/tests/browser_search_quickactions.js
@@ -0,0 +1,110 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// This tests the Privacy pane's Firefox QuickActions UI.
+
+"use strict";
+
+ChromeUtils.defineESModuleGetters(this, {
+  UrlbarProviderQuickActions:
+    "resource:///modules/UrlbarProviderQuickActions.sys.mjs",
+  UrlbarTestUtils: "resource://testing-common/UrlbarTestUtils.sys.mjs",
+});
+
+add_setup(async function setup() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.urlbar.suggest.quickactions", true],
+      ["browser.urlbar.quickactions.enabled", true],
+    ],
+  });
+
+  UrlbarProviderQuickActions.addAction("testaction", {
+    commands: ["testaction"],
+    label: "quickactions-downloads2",
+  });
+
+  registerCleanupFunction(() => {
+    UrlbarProviderQuickActions.removeAction("testaction");
+  });
+});
+
+async function isGroupHidden(tab) {
+  return SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [],
+    async () => content.document.getElementById("quickActionsBox").hidden
+  );
+}
+
+add_task(async function test_show_prefs() {
+  Services.prefs.setBoolPref("browser.urlbar.quickactions.showPrefs", false);
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:preferences#search"
+  );
+
+  Assert.ok(
+    await isGroupHidden(tab),
+    "The preferences are hidden when pref disabled"
+  );
+
+  Services.prefs.setBoolPref("browser.urlbar.quickactions.showPrefs", true);
+
+  Assert.ok(
+    !(await isGroupHidden(tab)),
+    "The preferences are shown when pref enabled"
+  );
+
+  Services.prefs.clearUserPref("browser.urlbar.quickactions.showPrefs");
+  await BrowserTestUtils.removeTab(tab);
+});
+
+async function testActionIsShown(window) {
+  await UrlbarTestUtils.promiseAutocompleteResultPopup({
+    window,
+    value: "testact",
+    waitForFocus: SimpleTest.waitForFocus,
+  });
+  try {
+    let { result } = await UrlbarTestUtils.getDetailsOfResultAt(window, 1);
+    return result.providerName == "quickactions";
+  } catch (e) {
+    return false;
+  }
+}
+
+add_task(async function test_prefs() {
+  Services.prefs.setBoolPref("browser.urlbar.quickactions.showPrefs", true);
+  Services.prefs.setBoolPref("browser.urlbar.suggest.quickactions", false);
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:preferences#search"
+  );
+
+  Assert.ok(
+    !(await testActionIsShown(window)),
+    "Actions are not shown while pref disabled"
+  );
+
+  await SpecialPowers.spawn(tab.linkedBrowser, [], async () => {
+    let checkbox = content.document.getElementById("enableQuickActions");
+    is(
+      checkbox.checked,
+      false,
+      "Checkbox is not checked while feature is disabled"
+    );
+    checkbox.click();
+  });
+
+  Assert.ok(
+    await testActionIsShown(window),
+    "Actions are shown after user clicks checkbox"
+  );
+
+  Services.prefs.clearUserPref("browser.urlbar.quickactions.showPrefs");
+  Services.prefs.clearUserPref("browser.urlbar.suggest.quickactions");
+  await BrowserTestUtils.removeTab(tab);
+});
diff --git a/browser/components/preferences/tests/browser_search_searchTerms.js b/browser/components/preferences/tests/browser_search_searchTerms.js
new file mode 100644
index 0000000000..03593d1c6c
--- /dev/null
+++ b/browser/components/preferences/tests/browser_search_searchTerms.js
@@ -0,0 +1,199 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+  Tests the showSearchTerms option on the about:preferences#search page.
+*/
+
+"use strict";
+
+ChromeUtils.defineLazyGetter(this, "QuickSuggestTestUtils", () => {
+  const { QuickSuggestTestUtils: module } = ChromeUtils.importESModule(
+    "resource://testing-common/QuickSuggestTestUtils.sys.mjs"
+  );
+  module.init(this);
+  return module;
+});
+
+const CHECKBOX_ID = "searchShowSearchTermCheckbox";
+const PREF_SEARCHTERMS = "browser.urlbar.showSearchTerms.enabled";
+const PREF_FEATUREGATE = "browser.urlbar.showSearchTerms.featureGate";
+
+/*
+  If Nimbus experiment is enabled, check option visibility.
+*/
+add_task(async function showSearchTermsVisibility_experiment_beforeOpen() {
+  await SpecialPowers.pushPrefEnv({
+    set: [[PREF_FEATUREGATE, false]],
+  });
+  await QuickSuggestTestUtils.withExperiment({
+    valueOverrides: {
+      showSearchTermsFeatureGate: true,
+    },
+    callback: async () => {
+      await openPreferencesViaOpenPreferencesAPI("search", {
+        leaveOpen: true,
+      });
+      let doc = gBrowser.selectedBrowser.contentDocument;
+      let container = doc.getElementById(CHECKBOX_ID);
+      Assert.ok(
+        BrowserTestUtils.isVisible(container),
+        "The option box is visible"
+      );
+      gBrowser.removeCurrentTab();
+    },
+  });
+  await SpecialPowers.popPrefEnv();
+});
+
+/*
+  If Nimbus experiment is not enabled initially but eventually enabled,
+  check option visibility on Preferences page.
+*/
+add_task(async function showSearchTermsVisibility_experiment_afterOpen() {
+  await SpecialPowers.pushPrefEnv({
+    set: [[PREF_FEATUREGATE, false]],
+  });
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let container = doc.getElementById(CHECKBOX_ID);
+  Assert.ok(
+    BrowserTestUtils.isHidden(container),
+    "The option box is initially hidden."
+  );
+
+  // Install experiment.
+  await QuickSuggestTestUtils.withExperiment({
+    valueOverrides: {
+      showSearchTermsFeatureGate: true,
+    },
+    callback: async () => {
+      Assert.ok(
+        BrowserTestUtils.isVisible(container),
+        "The option box is visible"
+      );
+    },
+  });
+
+  Assert.ok(
+    BrowserTestUtils.isHidden(container),
+    "The option box is hidden again after the experiment is uninstalled."
+  );
+
+  gBrowser.removeCurrentTab();
+  await SpecialPowers.popPrefEnv();
+});
+
+/*
+  Check using the checkbox modifies the preference.
+*/
+add_task(async function showSearchTerms_checkbox() {
+  // Enable the feature.
+  await SpecialPowers.pushPrefEnv({
+    set: [[PREF_FEATUREGATE, true]],
+  });
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+  let doc = gBrowser.selectedBrowser.contentDocument;
+
+  let option = doc.getElementById(CHECKBOX_ID);
+
+  // Evaluate checkbox pref is true.
+  Assert.ok(option.checked, "Option box should be checked.");
+
+  // Evaluate checkbox when pref is false.
+  await SpecialPowers.pushPrefEnv({
+    set: [[PREF_SEARCHTERMS, false]],
+  });
+  Assert.ok(!option.checked, "Option box should not be checked.");
+  await SpecialPowers.popPrefEnv();
+
+  // Evaluate pref when checkbox is un-checked.
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#" + CHECKBOX_ID,
+    {},
+    gBrowser.selectedBrowser
+  );
+  Assert.equal(
+    Services.prefs.getBoolPref(PREF_SEARCHTERMS),
+    false,
+    "Preference should be false if un-checked."
+  );
+
+  // Evaluate pref when checkbox is checked.
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#" + CHECKBOX_ID,
+    {},
+    gBrowser.selectedBrowser
+  );
+  Assert.equal(
+    Services.prefs.getBoolPref(PREF_SEARCHTERMS),
+    true,
+    "Preference should be true if checked."
+  );
+
+  // Clean-up.
+  Services.prefs.clearUserPref(PREF_SEARCHTERMS);
+  gBrowser.removeCurrentTab();
+  await SpecialPowers.popPrefEnv();
+});
+
+/*
+  When loading the search preferences panel, the
+  showSearchTerms checkbox should be hidden if
+  the search bar is enabled.
+*/
+add_task(async function showSearchTerms_and_searchBar_preference_load() {
+  // Enable the feature.
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [PREF_FEATUREGATE, true],
+      ["browser.search.widget.inNavBar", true],
+    ],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+  let doc = gBrowser.selectedBrowser.contentDocument;
+
+  let checkbox = doc.getElementById(CHECKBOX_ID);
+  Assert.ok(
+    checkbox.hidden,
+    "showSearchTerms checkbox should be hidden when search bar is enabled."
+  );
+
+  // Clean-up.
+  gBrowser.removeCurrentTab();
+  await SpecialPowers.popPrefEnv();
+});
+
+/*
+  If the search bar is enabled while the search
+  preferences panel is open, the showSearchTerms
+  checkbox should not be clickable.
+*/
+add_task(async function showSearchTerms_and_searchBar_preference_change() {
+  // Enable the feature.
+  await SpecialPowers.pushPrefEnv({
+    set: [[PREF_FEATUREGATE, true]],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+  let doc = gBrowser.selectedBrowser.contentDocument;
+
+  let checkbox = doc.getElementById(CHECKBOX_ID);
+  Assert.ok(!checkbox.hidden, "showSearchTerms checkbox should be shown.");
+
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.search.widget.inNavBar", true]],
+  });
+  Assert.ok(
+    checkbox.hidden,
+    "showSearchTerms checkbox should be hidden when search bar is enabled."
+  );
+
+  // Clean-up.
+  await SpecialPowers.popPrefEnv();
+  Assert.ok(!checkbox.hidden, "showSearchTerms checkbox should be shown.");
+
+  gBrowser.removeCurrentTab();
+  await SpecialPowers.popPrefEnv();
+});
diff --git a/browser/components/preferences/tests/browser_search_subdialog_tooltip_saved_addresses.js b/browser/components/preferences/tests/browser_search_subdialog_tooltip_saved_addresses.js
new file mode 100644
index 0000000000..8235f8dd19
--- /dev/null
+++ b/browser/components/preferences/tests/browser_search_subdialog_tooltip_saved_addresses.js
@@ -0,0 +1,39 @@
+"use strict";
+
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.search", true]],
+  });
+});
+
+add_task(async function test_show_search_term_tooltip_in_subdialog() {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+
+  let keyword = "organization";
+  await runSearchInput(keyword);
+
+  let formAutofillGroupBox = gBrowser.contentDocument.getElementById(
+    "formAutofillGroupBox"
+  );
+  let savedAddressesButton =
+    formAutofillGroupBox.querySelector(".accessory-button");
+
+  info("Clicking saved addresses button to open subdialog");
+  savedAddressesButton.click();
+  info("Waiting for addresses subdialog to appear");
+  await BrowserTestUtils.waitForCondition(() => {
+    let dialogBox = gBrowser.contentDocument.querySelector(".dialogBox");
+    return !!dialogBox;
+  });
+  let tooltip = gBrowser.contentDocument.querySelector(".search-tooltip");
+
+  is_element_visible(
+    tooltip,
+    "Tooltip with search term should be visible in subdialog"
+  );
+  is(tooltip.textContent, keyword, "Tooltip should have correct search term");
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_1.js b/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_1.js
new file mode 100644
index 0000000000..e676de0a6c
--- /dev/null
+++ b/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_1.js
@@ -0,0 +1,48 @@
+/*
+ * This file contains tests for the Preferences search bar.
+ */
+
+// Enabling Searching functionatily. Will display search bar form this testcase forward.
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.search", true]],
+  });
+});
+
+/**
+ * Test for searching for the "Set Home Page" subdialog.
+ */
+add_task(async function () {
+  // Set custom URL so bookmark button will be shown on the page (otherwise it is hidden)
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.startup.homepage", "about:robots"],
+      ["browser.startup.page", 1],
+    ],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("paneHome", { leaveOpen: true });
+
+  // Wait for Activity Stream to add its panels
+  await BrowserTestUtils.waitForCondition(() =>
+    SpecialPowers.spawn(
+      gBrowser.selectedTab.linkedBrowser,
+      [],
+      () => !!content.document.getElementById("homeContentsGroup")
+    )
+  );
+
+  await evaluateSearchResults("Set Home Page", "homepageGroup");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+/**
+ * Test for searching for the "Languages" subdialog.
+ */
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  await evaluateSearchResults("Choose languages", "languagesGroup");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_2.js b/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_2.js
new file mode 100644
index 0000000000..6ff05dee29
--- /dev/null
+++ b/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_2.js
@@ -0,0 +1,36 @@
+/*
+ * This file contains tests for the Preferences search bar.
+ */
+
+// Enabling Searching functionatily. Will display search bar form this testcase forward.
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.search", true]],
+  });
+});
+
+/**
+ * Test for searching for the "Saved Logins" subdialog.
+ */
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  await evaluateSearchResults("sites are stored", "passwordsGroup");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+/**
+ * Test for searching for the "Exceptions - Enhanced Tracking Protection" subdialog:
+ * "You can specify which websites have Enhanced Tracking Protection turned off." #permissions-exceptions-manage-etp-desc
+ */
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  await evaluateSearchResults(
+    "Enhanced Tracking Protection turned off",
+    "trackingGroup"
+  );
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_3.js b/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_3.js
new file mode 100644
index 0000000000..45f8774d73
--- /dev/null
+++ b/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_3.js
@@ -0,0 +1,35 @@
+/*
+ * This file contains tests for the Preferences search bar.
+ */
+
+// Enabling Searching functionatily. Will display search bar form this testcase forward.
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.search", true]],
+  });
+});
+
+/**
+ * Test for searching for the "Allowed Sites - Add-ons Installation" subdialog.
+ */
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  await evaluateSearchResults("allowed to install add-ons", "permissionsGroup");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+/**
+ * Test for searching for the "Certificate Manager" subdialog.
+ */
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  await evaluateSearchResults(
+    "identify these certificate authorities",
+    "certSelection"
+  );
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_4.js b/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_4.js
new file mode 100644
index 0000000000..9cfcb51f1b
--- /dev/null
+++ b/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_4.js
@@ -0,0 +1,39 @@
+/*
+ * This file contains tests for the Preferences search bar.
+ */
+
+// Enabling Searching functionatily. Will display search bar form this testcase forward.
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.search", true]],
+  });
+});
+
+/**
+ * Test for searching for the "Update History" subdialog.
+ */
+add_task(async function () {
+  // The updates panel is disabled in MSIX builds.
+  if (
+    AppConstants.platform === "win" &&
+    Services.sysinfo.getProperty("hasWinPackageId")
+  ) {
+    return;
+  }
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  await evaluateSearchResults("updates have been installed", "updateApp");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+/**
+ * Test for searching for the "Location Permissions" subdialog.
+ */
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  await evaluateSearchResults("location permissions", "permissionsGroup");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_5.js b/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_5.js
new file mode 100644
index 0000000000..4c0e67bb8a
--- /dev/null
+++ b/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_5.js
@@ -0,0 +1,49 @@
+/*
+ * This file contains tests for the Preferences search bar.
+ */
+
+requestLongerTimeout(2);
+
+// Enabling Searching functionatily. Will display search bar form this testcase forward.
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.search", true]],
+  });
+});
+
+/**
+ * Test for searching for the "Fonts" subdialog.
+ */
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  // Oh, Canada:
+  await evaluateSearchResults("Unified Canadian Syllabary", "fontsGroup");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+/**
+ * Test for searching for the "Colors" subdialog.
+ */
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  await evaluateSearchResults("Link Colors", "colorsGroup");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+/**
+ * Test for searching for the "Exceptions - Saved Logins" subdialog.
+ */
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  await evaluateSearchResults(
+    "won’t save passwords for sites listed here",
+    "passwordsGroup"
+  );
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_6.js b/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_6.js
new file mode 100644
index 0000000000..1091dd2dd4
--- /dev/null
+++ b/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_6.js
@@ -0,0 +1,35 @@
+/*
+ * This file contains tests for the Preferences search bar.
+ */
+
+// Enabling Searching functionatily. Will display search bar form this testcase forward.
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.search", true]],
+  });
+});
+
+/**
+ * Test for searching for the "Block Lists" subdialog.
+ */
+add_task(async function () {
+  async function doTest() {
+    await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+      leaveOpen: true,
+    });
+    await evaluateSearchResults("block online trackers", "trackingGroup");
+    BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  }
+  await doTest();
+});
+
+/**
+ * Test for searching for the "Allowed Sites - Pop-ups" subdialog.
+ */
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  await evaluateSearchResults("open pop-up windows", "permissionsGroup");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_7.js b/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_7.js
new file mode 100644
index 0000000000..1c4a923f06
--- /dev/null
+++ b/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_7.js
@@ -0,0 +1,34 @@
+/*
+ * This file contains tests for the Preferences search bar.
+ */
+
+requestLongerTimeout(2);
+
+// Enabling Searching functionatily. Will display search bar form this testcase forward.
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.search", true]],
+  });
+});
+
+/**
+ * Test for searching for the "Device Manager" subdialog.
+ */
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  await evaluateSearchResults("Security Modules and Devices", "certSelection");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+/**
+ * Test for searching for the "Connection Settings" subdialog.
+ */
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  await evaluateSearchResults("Use system proxy settings", "connectionGroup");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_8.js b/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_8.js
new file mode 100644
index 0000000000..9827e89239
--- /dev/null
+++ b/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_8.js
@@ -0,0 +1,45 @@
+/*
+ * This file contains tests for the Preferences search bar.
+ */
+
+requestLongerTimeout(2);
+
+// Enabling Searching functionatily. Will display search bar form this testcase forward.
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.search", true]],
+  });
+});
+
+/**
+ * Test for searching for the "Camera Permissions" subdialog.
+ */
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  await evaluateSearchResults("camera permissions", "permissionsGroup");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+/**
+ * Test for searching for the "Microphone Permissions" subdialog.
+ */
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  await evaluateSearchResults("microphone permissions", "permissionsGroup");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+/**
+ * Test for searching for the "Notification Permissions" subdialog.
+ */
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  await evaluateSearchResults("notification permissions", "permissionsGroup");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_site_data.js b/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_site_data.js
new file mode 100644
index 0000000000..a46b7545ff
--- /dev/null
+++ b/browser/components/preferences/tests/browser_search_subdialogs_within_preferences_site_data.js
@@ -0,0 +1,48 @@
+/*
+ * This file contains tests for the Preferences search bar.
+ */
+
+// Enabling Searching functionatily. Will display search bar form this testcase forward.
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.search", true]],
+  });
+});
+
+/**
+ * Test for searching for the "Settings - Site Data" subdialog.
+ */
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["cookiebanners.ui.desktop.enabled", false]],
+  });
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  await evaluateSearchResults("cookies", ["siteDataGroup", "trackingGroup"]);
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  await evaluateSearchResults("site data", ["siteDataGroup"]);
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  await evaluateSearchResults("cache", ["siteDataGroup"]);
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  await evaluateSearchResults("cross-site", ["trackingGroup"]);
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_search_within_preferences_1.js b/browser/components/preferences/tests/browser_search_within_preferences_1.js
new file mode 100644
index 0000000000..504191ecb5
--- /dev/null
+++ b/browser/components/preferences/tests/browser_search_within_preferences_1.js
@@ -0,0 +1,344 @@
+"use strict";
+/**
+ * This file contains tests for the Preferences search bar.
+ */
+
+requestLongerTimeout(6);
+
+/**
+ * Tests to see if search bar is being shown when pref is turned on
+ */
+add_task(async function show_search_bar_when_pref_is_enabled() {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  let searchInput = gBrowser.contentDocument.getElementById("searchInput");
+  is_element_visible(searchInput, "Search box should be shown");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+/**
+ * Test for "Search Result" panel.
+ * After it runs a search, it tests if the "Search Results" panel is the only selected category.
+ * The search is then cleared, it then tests if the "General" panel is the only selected category.
+ */
+add_task(async function show_search_results_pane_only_then_revert_to_general() {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+
+  // Performs search
+  let searchInput = gBrowser.contentDocument.getElementById("searchInput");
+
+  is(
+    searchInput,
+    gBrowser.contentDocument.activeElement.closest("#searchInput"),
+    "Search input should be focused when visiting preferences"
+  );
+
+  let query = "password";
+  let searchCompletedPromise = BrowserTestUtils.waitForEvent(
+    gBrowser.contentWindow,
+    "PreferencesSearchCompleted",
+    evt => evt.detail == query
+  );
+  EventUtils.sendString(query);
+  await searchCompletedPromise;
+
+  let categoriesList = gBrowser.contentDocument.getElementById("categories");
+
+  for (let i = 0; i < categoriesList.childElementCount; i++) {
+    let child = categoriesList.itemChildren[i];
+    is(child.selected, false, "No other panel should be selected");
+  }
+  // Takes search off
+  searchCompletedPromise = BrowserTestUtils.waitForEvent(
+    gBrowser.contentWindow,
+    "PreferencesSearchCompleted",
+    evt => evt.detail == ""
+  );
+  let count = query.length;
+  while (count--) {
+    EventUtils.sendKey("BACK_SPACE");
+  }
+  await searchCompletedPromise;
+
+  // Checks if back to generalPane
+  for (let i = 0; i < categoriesList.childElementCount; i++) {
+    let child = categoriesList.itemChildren[i];
+    if (child.id == "category-general") {
+      is(child.selected, true, "General panel should be selected");
+    } else if (child.id) {
+      is(child.selected, false, "No other panel should be selected");
+    }
+  }
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+/**
+ * Test for "password" case. When we search "password", it should show the "passwordGroup"
+ */
+add_task(async function search_for_password_show_passwordGroup() {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+
+  // Performs search
+  let searchInput = gBrowser.contentDocument.getElementById("searchInput");
+
+  is(
+    searchInput,
+    gBrowser.contentDocument.activeElement.closest("#searchInput"),
+    "Search input should be focused when visiting preferences"
+  );
+
+  let query = "password";
+  let searchCompletedPromise = BrowserTestUtils.waitForEvent(
+    gBrowser.contentWindow,
+    "PreferencesSearchCompleted",
+    evt => evt.detail == query
+  );
+  EventUtils.sendString(query);
+  await searchCompletedPromise;
+
+  let mainPrefTag = gBrowser.contentDocument.getElementById("mainPrefPane");
+
+  for (let i = 0; i < mainPrefTag.childElementCount; i++) {
+    let child = mainPrefTag.children[i];
+    if (
+      child.id == "passwordsGroup" ||
+      child.id == "weavePrefsDeck" ||
+      child.id == "header-searchResults" ||
+      child.id == "certSelection" ||
+      child.id == "connectionGroup" ||
+      child.id == "dataMigrationGroup"
+    ) {
+      is_element_visible(child, "Should be in search results");
+    } else if (child.id) {
+      is_element_hidden(child, "Should not be in search results");
+    }
+  }
+
+  // Takes search off
+  searchCompletedPromise = BrowserTestUtils.waitForEvent(
+    gBrowser.contentWindow,
+    "PreferencesSearchCompleted",
+    evt => evt.detail == ""
+  );
+  let count = query.length;
+  while (count--) {
+    EventUtils.sendKey("BACK_SPACE");
+  }
+  await searchCompletedPromise;
+
+  let expectedChildren = [
+    "paneGeneral",
+    "startupGroup",
+    "languagesGroup",
+    "webAppearanceGroup",
+    "colorsGroup",
+    "fontsGroup",
+    "zoomGroup",
+    "downloadsGroup",
+    "applicationsGroup",
+    "drmGroup",
+    "browsingGroup",
+    "performanceGroup",
+    "connectionGroup",
+    "generalCategory",
+    "languageAndAppearanceCategory",
+    "filesAndApplicationsCategory",
+    "performanceCategory",
+    "browsingCategory",
+    "networkProxyCategory",
+    "dataMigrationGroup",
+    "translationsGroup",
+  ];
+  // Only visible for non-MSIX builds
+  if (
+    AppConstants.platform !== "win" ||
+    !Services.sysinfo.getProperty("hasWinPackageId", false)
+  ) {
+    expectedChildren.push("updatesCategory");
+    expectedChildren.push("updateApp");
+  }
+  // Checks if back to generalPane
+  for (let i = 0; i < mainPrefTag.childElementCount; i++) {
+    let child = mainPrefTag.children[i];
+    if (expectedChildren.includes(child.id)) {
+      is_element_visible(child, `Should be in general tab: ${child.id}`);
+    } else if (child.id) {
+      is_element_hidden(child, `Should not be in general tab: ${child.id}`);
+    }
+  }
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+/**
+ * Test for if nothing is found
+ */
+add_task(async function search_with_nothing_found() {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+
+  let noResultsEl = gBrowser.contentDocument.querySelector(
+    "#no-results-message"
+  );
+  let sorryMsgQueryEl = gBrowser.contentDocument.getElementById(
+    "sorry-message-query"
+  );
+
+  is_element_hidden(noResultsEl, "Should not be in search results yet");
+
+  // Performs search
+  let searchInput = gBrowser.contentDocument.getElementById("searchInput");
+
+  is(
+    searchInput,
+    gBrowser.contentDocument.activeElement.closest("#searchInput"),
+    "Search input should be focused when visiting preferences"
+  );
+
+  let query = "coach";
+  let searchCompletedPromise = BrowserTestUtils.waitForEvent(
+    gBrowser.contentWindow,
+    "PreferencesSearchCompleted",
+    evt => evt.detail == query
+  );
+  EventUtils.sendString(query);
+  await searchCompletedPromise;
+
+  is_element_visible(noResultsEl, "Should be in search results");
+  is(
+    sorryMsgQueryEl.textContent,
+    query,
+    "sorry-message-query should contain the query"
+  );
+
+  // Takes search off
+  searchCompletedPromise = BrowserTestUtils.waitForEvent(
+    gBrowser.contentWindow,
+    "PreferencesSearchCompleted",
+    evt => evt.detail == ""
+  );
+  let count = query.length;
+  while (count--) {
+    EventUtils.sendKey("BACK_SPACE");
+  }
+  await searchCompletedPromise;
+
+  is_element_hidden(noResultsEl, "Should not be in search results");
+  is(
+    sorryMsgQueryEl.textContent.length,
+    0,
+    "sorry-message-query should be empty"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+/**
+ * Test for if we go back to general tab after search case
+ */
+add_task(async function exiting_search_reverts_to_general_pane() {
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  let generalPane = gBrowser.contentDocument.getElementById("generalCategory");
+
+  is_element_hidden(generalPane, "Should not be in general");
+
+  // Performs search
+  let searchInput = gBrowser.contentDocument.getElementById("searchInput");
+
+  is(
+    searchInput,
+    gBrowser.contentDocument.activeElement.closest("#searchInput"),
+    "Search input should be focused when visiting preferences"
+  );
+
+  let query = "password";
+  let searchCompletedPromise = BrowserTestUtils.waitForEvent(
+    gBrowser.contentWindow,
+    "PreferencesSearchCompleted",
+    evt => evt.detail == query
+  );
+  EventUtils.sendString(query);
+  await searchCompletedPromise;
+
+  // Takes search off
+  searchCompletedPromise = BrowserTestUtils.waitForEvent(
+    gBrowser.contentWindow,
+    "PreferencesSearchCompleted",
+    evt => evt.detail == ""
+  );
+  let count = query.length;
+  while (count--) {
+    EventUtils.sendKey("BACK_SPACE");
+  }
+  await searchCompletedPromise;
+
+  // Checks if back to normal
+  is_element_visible(generalPane, "Should be in generalPane");
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+/**
+ * Test for if we go to another tab after searching
+ */
+add_task(async function changing_tabs_after_searching() {
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  let searchInput = gBrowser.contentDocument.getElementById("searchInput");
+
+  is(
+    searchInput,
+    gBrowser.contentDocument.activeElement.closest("#searchInput"),
+    "Search input should be focused when visiting preferences"
+  );
+
+  let query = "permission";
+  let searchCompletedPromise = BrowserTestUtils.waitForEvent(
+    gBrowser.contentWindow,
+    "PreferencesSearchCompleted",
+    evt => evt.detail == query
+  );
+  EventUtils.sendString(query);
+  await searchCompletedPromise;
+
+  // Search header should be shown for the permissions group
+  let permissionsSearchHeader = gBrowser.contentDocument.querySelector(
+    "#permissionsGroup .search-header"
+  );
+  is(
+    permissionsSearchHeader.hidden,
+    false,
+    "Permissions search-header should be visible"
+  );
+
+  let privacyCategory =
+    gBrowser.contentDocument.getElementById("category-privacy");
+  privacyCategory.click();
+  is(searchInput.value, "", "search input should be empty");
+  let categoriesList = gBrowser.contentDocument.getElementById("categories");
+  for (let i = 0; i < categoriesList.childElementCount; i++) {
+    let child = categoriesList.itemChildren[i];
+    if (child.id == "category-privacy") {
+      is(child.selected, true, "Privacy panel should be selected");
+    } else if (child.id) {
+      is(child.selected, false, "No other panel should be selected");
+    }
+  }
+
+  // Search header should now be hidden when viewing the permissions group not through a search
+  is(
+    permissionsSearchHeader.hidden,
+    true,
+    "Permissions search-header should be hidden"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_search_within_preferences_2.js b/browser/components/preferences/tests/browser_search_within_preferences_2.js
new file mode 100644
index 0000000000..6de068fbe4
--- /dev/null
+++ b/browser/components/preferences/tests/browser_search_within_preferences_2.js
@@ -0,0 +1,180 @@
+"use strict";
+/**
+ * This file contains tests for the Preferences search bar.
+ */
+
+/**
+ * Enabling searching functionality. Will display search bar from this testcase forward.
+ */
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.preferences.search", true]],
+  });
+});
+
+/**
+ * Test that we only search the selected child of a XUL deck.
+ * When we search "Remove Account",
+ * it should not show the "Remove Account" button if the Firefox account is not logged in yet.
+ */
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("paneSync", { leaveOpen: true });
+
+  let weavePrefsDeck =
+    gBrowser.contentDocument.getElementById("weavePrefsDeck");
+  is(
+    weavePrefsDeck.selectedIndex,
+    0,
+    "Should select the #noFxaAccount child node"
+  );
+
+  // Performs search.
+  let searchInput = gBrowser.contentDocument.getElementById("searchInput");
+
+  is(
+    searchInput,
+    gBrowser.contentDocument.activeElement.closest("#searchInput"),
+    "Search input should be focused when visiting preferences"
+  );
+
+  let query = "Sync";
+  let searchCompletedPromise = BrowserTestUtils.waitForEvent(
+    gBrowser.contentWindow,
+    "PreferencesSearchCompleted",
+    evt => evt.detail == query
+  );
+  EventUtils.sendString(query);
+  await searchCompletedPromise;
+
+  let mainPrefTag = gBrowser.contentDocument.getElementById("mainPrefPane");
+  for (let i = 0; i < mainPrefTag.childElementCount; i++) {
+    let child = mainPrefTag.children[i];
+    if (child.id == "header-searchResults" || child.id == "weavePrefsDeck") {
+      is_element_visible(child, "Should be in search results");
+    } else if (child.id) {
+      is_element_hidden(child, "Should not be in search results");
+    }
+  }
+
+  // Ensure the "Remove Account" button exists in the hidden child of the <xul:deck>.
+  let unlinkFxaAccount = weavePrefsDeck.children[1].querySelector(
+    "#unverifiedUnlinkFxaAccount"
+  );
+  is(
+    unlinkFxaAccount.label,
+    "Remove Account",
+    "The Remove Account button should exist"
+  );
+
+  // Performs search.
+  searchInput.focus();
+  query = "Remove Account";
+  searchCompletedPromise = BrowserTestUtils.waitForEvent(
+    gBrowser.contentWindow,
+    "PreferencesSearchCompleted",
+    evt => evt.detail == query
+  );
+  EventUtils.sendString(query);
+  await searchCompletedPromise;
+
+  let noResultsEl = gBrowser.contentDocument.querySelector(
+    "#no-results-message"
+  );
+  is_element_visible(noResultsEl, "Should be reporting no results");
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+/**
+ * Test that we search using `search-l10n-ids`.
+ *
+ * The test uses element `showUpdateHistory` and
+ * l10n id `language-and-appearance-header` and expects the element
+ * to be matched on the first word from the l10n id value ("Language" in en-US).
+ */
+add_task(async function () {
+  let l10nId = "language-and-appearance-header";
+
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+
+  // First, lets make sure that the element is not matched without
+  // `search-l10n-ids`.
+  {
+    let searchInput = gBrowser.contentDocument.getElementById("searchInput");
+    let suhElem = gBrowser.contentDocument.getElementById("showUpdateHistory");
+
+    is(
+      searchInput,
+      gBrowser.contentDocument.activeElement.closest("#searchInput"),
+      "Search input should be focused when visiting preferences"
+    );
+
+    ok(
+      !suhElem.getAttribute("search-l10n-ids").includes(l10nId),
+      "showUpdateHistory element should not contain the l10n id here."
+    );
+
+    let query = "Language";
+    let searchCompletedPromise = BrowserTestUtils.waitForEvent(
+      gBrowser.contentWindow,
+      "PreferencesSearchCompleted",
+      evt => evt.detail == query
+    );
+    EventUtils.sendString(query);
+    await searchCompletedPromise;
+
+    is_element_hidden(
+      suhElem,
+      "showUpdateHistory should not be in search results"
+    );
+  }
+
+  await BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  // Now, let's add the l10n id to the element and perform the same search again.
+
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+
+  {
+    let searchInput = gBrowser.contentDocument.getElementById("searchInput");
+
+    is(
+      searchInput,
+      gBrowser.contentDocument.activeElement.closest("#searchInput"),
+      "Search input should be focused when visiting preferences"
+    );
+
+    let suhElem = gBrowser.contentDocument.getElementById("showUpdateHistory");
+    suhElem.setAttribute("search-l10n-ids", l10nId);
+
+    let query = "Language";
+    let searchCompletedPromise = BrowserTestUtils.waitForEvent(
+      gBrowser.contentWindow,
+      "PreferencesSearchCompleted",
+      evt => evt.detail == query
+    );
+    EventUtils.sendString(query);
+    await searchCompletedPromise;
+
+    if (
+      AppConstants.platform === "win" &&
+      Services.sysinfo.getProperty("hasWinPackageId")
+    ) {
+      is_element_hidden(
+        suhElem,
+        "showUpdateHistory should not be in search results"
+      );
+    } else {
+      is_element_visible(
+        suhElem,
+        "showUpdateHistory should be in search results"
+      );
+    }
+  }
+
+  await BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_search_within_preferences_command.js b/browser/components/preferences/tests/browser_search_within_preferences_command.js
new file mode 100644
index 0000000000..736493b418
--- /dev/null
+++ b/browser/components/preferences/tests/browser_search_within_preferences_command.js
@@ -0,0 +1,45 @@
+"use strict";
+
+/**
+ * Test for "command" event on search input (when user clicks the x button)
+ */
+add_task(async function () {
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  let generalPane = gBrowser.contentDocument.getElementById("generalCategory");
+
+  is_element_hidden(generalPane, "Should not be in general");
+
+  // Performs search
+  let searchInput = gBrowser.contentDocument.getElementById("searchInput");
+  is(
+    searchInput,
+    gBrowser.contentDocument.activeElement.closest("#searchInput"),
+    "Search input should be focused when visiting preferences"
+  );
+
+  let query = "x";
+  let searchCompletedPromise = BrowserTestUtils.waitForEvent(
+    gBrowser.contentWindow,
+    "PreferencesSearchCompleted",
+    evt => evt.detail == query
+  );
+  EventUtils.sendString(query);
+  await searchCompletedPromise;
+
+  is_element_hidden(generalPane, "Should not be in generalPane");
+
+  // Takes search off with "command"
+  searchCompletedPromise = BrowserTestUtils.waitForEvent(
+    gBrowser.contentWindow,
+    "PreferencesSearchCompleted",
+    evt => evt.detail == ""
+  );
+  searchInput.value = "";
+  searchInput.doCommand();
+  await searchCompletedPromise;
+
+  // Checks if back to normal
+  is_element_visible(generalPane, "Should be in generalPane");
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_searchsuggestions.js b/browser/components/preferences/tests/browser_searchsuggestions.js
new file mode 100644
index 0000000000..6aca310eb2
--- /dev/null
+++ b/browser/components/preferences/tests/browser_searchsuggestions.js
@@ -0,0 +1,231 @@
+const SUGGEST_PREF_NAME = "browser.search.suggest.enabled";
+const URLBAR_SUGGEST_PREF_NAME = "browser.urlbar.suggest.searches";
+const PRIVATE_PREF_NAME = "browser.search.suggest.enabled.private";
+const SEARCHBAR_PREF_NAME = "browser.search.widget.inNavBar";
+
+let initialUrlbarSuggestValue;
+let initialSuggestionsInPrivateValue;
+
+add_setup(async function () {
+  const originalSuggest = Services.prefs.getBoolPref(SUGGEST_PREF_NAME);
+  initialUrlbarSuggestValue = Services.prefs.getBoolPref(
+    URLBAR_SUGGEST_PREF_NAME
+  );
+  initialSuggestionsInPrivateValue =
+    Services.prefs.getBoolPref(PRIVATE_PREF_NAME);
+
+  registerCleanupFunction(() => {
+    Services.prefs.setBoolPref(SUGGEST_PREF_NAME, originalSuggest);
+    Services.prefs.setBoolPref(
+      PRIVATE_PREF_NAME,
+      initialSuggestionsInPrivateValue
+    );
+  });
+});
+
+async function toggleElement(
+  id,
+  prefName,
+  element,
+  initialCheckboxValue,
+  initialPrefValue,
+  descCheckbox,
+  descPref,
+  shouldUpdatePref = false
+) {
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    `#${id}`,
+    {},
+    gBrowser.selectedBrowser
+  );
+  is(
+    element.checked,
+    !initialCheckboxValue,
+    `Should have flipped the ${descCheckbox} checkbox`
+  );
+  let expectedPrefValue = shouldUpdatePref
+    ? !initialPrefValue
+    : initialPrefValue;
+  let prefValue = Services.prefs.getBoolPref(prefName);
+
+  is(
+    prefValue,
+    expectedPrefValue,
+    `Should ${
+      shouldUpdatePref ? "" : "not"
+    } have updated the ${descPref} preference value`
+  );
+
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    `#${id}`,
+    {},
+    gBrowser.selectedBrowser
+  );
+  is(
+    element.checked,
+    initialCheckboxValue,
+    `Should have flipped the ${descCheckbox} checkbox back to the original value`
+  );
+  prefValue = Services.prefs.getBoolPref(prefName);
+  expectedPrefValue = shouldUpdatePref ? !expectedPrefValue : initialPrefValue;
+  is(
+    prefValue,
+    expectedPrefValue,
+    `Should ${
+      shouldUpdatePref ? "" : "not"
+    } have updated the ${descPref} preference value`
+  );
+}
+
+// Open with suggestions enabled
+add_task(async function test_suggestions_start_enabled() {
+  Services.prefs.setBoolPref(SUGGEST_PREF_NAME, true);
+  Services.prefs.setBoolPref(SEARCHBAR_PREF_NAME, true);
+
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let urlbarBox = doc.getElementById("urlBarSuggestion");
+  let privateBox = doc.getElementById("showSearchSuggestionsPrivateWindows");
+  ok(!urlbarBox.disabled, "Should have enabled the urlbar checkbox");
+  ok(
+    !privateBox.disabled,
+    "Should have enabled the private mode suggestions checkbox"
+  );
+  is(
+    urlbarBox.checked,
+    initialUrlbarSuggestValue,
+    "Should have the correct value for the urlbar checkbox"
+  );
+  is(
+    privateBox.checked,
+    initialSuggestionsInPrivateValue,
+    "Should have the correct value for the private mode suggestions checkbox"
+  );
+
+  await toggleElement(
+    "urlBarSuggestion",
+    URLBAR_SUGGEST_PREF_NAME,
+    urlbarBox,
+    initialUrlbarSuggestValue,
+    initialUrlbarSuggestValue,
+    "urlbar",
+    "urlbar",
+    true
+  );
+
+  await toggleElement(
+    "showSearchSuggestionsPrivateWindows",
+    PRIVATE_PREF_NAME,
+    privateBox,
+    initialSuggestionsInPrivateValue,
+    initialSuggestionsInPrivateValue,
+    "private suggestion",
+    "private suggestion",
+    true
+  );
+
+  Services.prefs.setBoolPref(SUGGEST_PREF_NAME, false);
+  ok(!urlbarBox.checked, "Should have unchecked the urlbar box");
+  ok(urlbarBox.disabled, "Should have disabled the urlbar box");
+  Services.prefs.setBoolPref(SEARCHBAR_PREF_NAME, false);
+  ok(urlbarBox.hidden, "Should have hidden the urlbar box");
+  ok(!privateBox.checked, "Should have unchecked the private suggestions box");
+  ok(privateBox.disabled, "Should have disabled the private suggestions box");
+
+  gBrowser.removeCurrentTab();
+});
+
+// Open with suggestions disabled
+add_task(async function test_suggestions_start_disabled() {
+  Services.prefs.setBoolPref(SUGGEST_PREF_NAME, false);
+
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let urlbarBox = doc.getElementById("urlBarSuggestion");
+  ok(urlbarBox.disabled, "Should have the urlbar box disabled");
+  let privateBox = doc.getElementById("showSearchSuggestionsPrivateWindows");
+  ok(privateBox.disabled, "Should have the private suggestions box disabled");
+
+  Services.prefs.setBoolPref(SUGGEST_PREF_NAME, true);
+
+  ok(!urlbarBox.disabled, "Should have enabled the urlbar box");
+  ok(!privateBox.disabled, "Should have enabled the private suggestions box");
+
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function test_sync_search_suggestions_prefs() {
+  info("Adding the search bar to the toolbar");
+  Services.prefs.setBoolPref(SEARCHBAR_PREF_NAME, true);
+  Services.prefs.setBoolPref(SUGGEST_PREF_NAME, true);
+  Services.prefs.setBoolPref(URLBAR_SUGGEST_PREF_NAME, false);
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let suggestionsInSearchFieldsCheckbox = doc.getElementById(
+    "suggestionsInSearchFieldsCheckbox"
+  );
+
+  is(
+    suggestionsInSearchFieldsCheckbox.checked,
+    true,
+    "Should have the correct value for the search suggestions checkbox"
+  );
+
+  is(
+    Services.prefs.getBoolPref(SUGGEST_PREF_NAME),
+    true,
+    `${SUGGEST_PREF_NAME} should be enabled`
+  );
+  is(
+    Services.prefs.getBoolPref(URLBAR_SUGGEST_PREF_NAME),
+    false,
+    `${URLBAR_SUGGEST_PREF_NAME} should be disabled`
+  );
+
+  await toggleElement(
+    "suggestionsInSearchFieldsCheckbox",
+    URLBAR_SUGGEST_PREF_NAME,
+    suggestionsInSearchFieldsCheckbox,
+    suggestionsInSearchFieldsCheckbox.checked,
+    false,
+    "search suggestion",
+    "urlbar suggest"
+  );
+
+  info("Removing the search bar from the toolbar");
+  Services.prefs.setBoolPref(SEARCHBAR_PREF_NAME, false);
+
+  const suggestsPref = [true, false];
+  const urlbarSuggestsPref = [true, false];
+
+  for (let suggestState of suggestsPref) {
+    for (let urlbarSuggestsState of urlbarSuggestsPref) {
+      Services.prefs.setBoolPref(SUGGEST_PREF_NAME, suggestState);
+      Services.prefs.setBoolPref(URLBAR_SUGGEST_PREF_NAME, urlbarSuggestsState);
+
+      if (suggestState && urlbarSuggestsState) {
+        ok(
+          suggestionsInSearchFieldsCheckbox.checked,
+          "Should have checked the suggestions checkbox"
+        );
+      } else {
+        ok(
+          !suggestionsInSearchFieldsCheckbox.checked,
+          "Should have unchecked the suggestions checkbox"
+        );
+      }
+      ok(
+        !suggestionsInSearchFieldsCheckbox.disabled,
+        "Should have the suggestions checkbox enabled"
+      );
+    }
+  }
+
+  gBrowser.removeCurrentTab();
+  Services.prefs.clearUserPref(SEARCHBAR_PREF_NAME);
+  Services.prefs.clearUserPref(URLBAR_SUGGEST_PREF_NAME);
+  Services.prefs.clearUserPref(SUGGEST_PREF_NAME);
+});
diff --git a/browser/components/preferences/tests/browser_security-1.js b/browser/components/preferences/tests/browser_security-1.js
new file mode 100644
index 0000000000..80f3e6902b
--- /dev/null
+++ b/browser/components/preferences/tests/browser_security-1.js
@@ -0,0 +1,106 @@
+const PREFS = [
+  "browser.safebrowsing.phishing.enabled",
+  "browser.safebrowsing.malware.enabled",
+
+  "browser.safebrowsing.downloads.enabled",
+
+  "browser.safebrowsing.downloads.remote.block_potentially_unwanted",
+  "browser.safebrowsing.downloads.remote.block_uncommon",
+];
+
+let originals = PREFS.map(pref => [pref, Services.prefs.getBoolPref(pref)]);
+let originalMalwareTable = Services.prefs.getCharPref(
+  "urlclassifier.malwareTable"
+);
+registerCleanupFunction(function () {
+  originals.forEach(([pref, val]) => Services.prefs.setBoolPref(pref, val));
+  Services.prefs.setCharPref(
+    "urlclassifier.malwareTable",
+    originalMalwareTable
+  );
+});
+
+// This test only opens the Preferences once, and then reloads the page
+// each time that it wants to test various preference combinations. We
+// only use one tab (instead of opening/closing for each test) for all
+// to help improve test times on debug builds.
+add_setup(async function () {
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  registerCleanupFunction(async function () {
+    BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  });
+});
+
+// test the safebrowsing preference
+add_task(async function () {
+  async function checkPrefSwitch(val1, val2) {
+    Services.prefs.setBoolPref("browser.safebrowsing.phishing.enabled", val1);
+    Services.prefs.setBoolPref("browser.safebrowsing.malware.enabled", val2);
+
+    gBrowser.reload();
+    await BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+
+    let doc = gBrowser.selectedBrowser.contentDocument;
+    let checkbox = doc.getElementById("enableSafeBrowsing");
+    let blockDownloads = doc.getElementById("blockDownloads");
+    let blockUncommon = doc.getElementById("blockUncommonUnwanted");
+    let checked = checkbox.checked;
+    is(
+      blockDownloads.hasAttribute("disabled"),
+      !checked,
+      "block downloads checkbox is set correctly"
+    );
+
+    is(
+      checked,
+      val1 && val2,
+      "safebrowsing preference is initialized correctly"
+    );
+    // should be disabled when checked is false (= pref is turned off)
+    is(
+      blockUncommon.hasAttribute("disabled"),
+      !checked,
+      "block uncommon checkbox is set correctly"
+    );
+
+    // scroll the checkbox into the viewport and click checkbox
+    checkbox.scrollIntoView();
+    EventUtils.synthesizeMouseAtCenter(
+      checkbox,
+      {},
+      gBrowser.selectedBrowser.contentWindow
+    );
+
+    // check that both settings are now turned on or off
+    is(
+      Services.prefs.getBoolPref("browser.safebrowsing.phishing.enabled"),
+      !checked,
+      "safebrowsing.enabled is set correctly"
+    );
+    is(
+      Services.prefs.getBoolPref("browser.safebrowsing.malware.enabled"),
+      !checked,
+      "safebrowsing.malware.enabled is set correctly"
+    );
+
+    // check if the other checkboxes have updated
+    checked = checkbox.checked;
+    if (blockDownloads) {
+      is(
+        blockDownloads.hasAttribute("disabled"),
+        !checked,
+        "block downloads checkbox is set correctly"
+      );
+      is(
+        blockUncommon.hasAttribute("disabled"),
+        !checked || !blockDownloads.checked,
+        "block uncommon checkbox is set correctly"
+      );
+    }
+  }
+
+  await checkPrefSwitch(true, true);
+  await checkPrefSwitch(false, true);
+  await checkPrefSwitch(true, false);
+  await checkPrefSwitch(false, false);
+});
diff --git a/browser/components/preferences/tests/browser_security-2.js b/browser/components/preferences/tests/browser_security-2.js
new file mode 100644
index 0000000000..88be366810
--- /dev/null
+++ b/browser/components/preferences/tests/browser_security-2.js
@@ -0,0 +1,177 @@
+const PREFS = [
+  "browser.safebrowsing.phishing.enabled",
+  "browser.safebrowsing.malware.enabled",
+
+  "browser.safebrowsing.downloads.enabled",
+
+  "browser.safebrowsing.downloads.remote.block_potentially_unwanted",
+  "browser.safebrowsing.downloads.remote.block_uncommon",
+];
+
+let originals = PREFS.map(pref => [pref, Services.prefs.getBoolPref(pref)]);
+let originalMalwareTable = Services.prefs.getCharPref(
+  "urlclassifier.malwareTable"
+);
+registerCleanupFunction(function () {
+  originals.forEach(([pref, val]) => Services.prefs.setBoolPref(pref, val));
+  Services.prefs.setCharPref(
+    "urlclassifier.malwareTable",
+    originalMalwareTable
+  );
+});
+
+// This test only opens the Preferences once, and then reloads the page
+// each time that it wants to test various preference combinations. We
+// only use one tab (instead of opening/closing for each test) for all
+// to help improve test times on debug builds.
+add_setup(async function () {
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  registerCleanupFunction(async function () {
+    BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  });
+});
+
+// test the download protection preference
+add_task(async function () {
+  async function checkPrefSwitch(val) {
+    Services.prefs.setBoolPref("browser.safebrowsing.downloads.enabled", val);
+
+    gBrowser.reload();
+    await BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+
+    let doc = gBrowser.selectedBrowser.contentDocument;
+    let checkbox = doc.getElementById("blockDownloads");
+
+    let blockUncommon = doc.getElementById("blockUncommonUnwanted");
+    let checked = checkbox.checked;
+    is(checked, val, "downloads preference is initialized correctly");
+    // should be disabled when val is false (= pref is turned off)
+    is(
+      blockUncommon.hasAttribute("disabled"),
+      !val,
+      "block uncommon checkbox is set correctly"
+    );
+
+    // scroll the checkbox into view, otherwise the synthesizeMouseAtCenter will be ignored, and click it
+    checkbox.scrollIntoView();
+    EventUtils.synthesizeMouseAtCenter(
+      checkbox,
+      {},
+      gBrowser.selectedBrowser.contentWindow
+    );
+
+    // check that setting is now turned on or off
+    is(
+      Services.prefs.getBoolPref("browser.safebrowsing.downloads.enabled"),
+      !checked,
+      "safebrowsing.downloads preference is set correctly"
+    );
+
+    // check if the uncommon warning checkbox has updated
+    is(
+      blockUncommon.hasAttribute("disabled"),
+      val,
+      "block uncommon checkbox is set correctly"
+    );
+  }
+
+  await checkPrefSwitch(true);
+  await checkPrefSwitch(false);
+});
+
+requestLongerTimeout(2);
+// test the unwanted/uncommon software warning preference
+add_task(async function () {
+  async function checkPrefSwitch(val1, val2, isV2) {
+    Services.prefs.setBoolPref(
+      "browser.safebrowsing.downloads.remote.block_potentially_unwanted",
+      val1
+    );
+    Services.prefs.setBoolPref(
+      "browser.safebrowsing.downloads.remote.block_uncommon",
+      val2
+    );
+    let testMalwareTable = "goog-malware-" + (isV2 ? "shavar" : "proto");
+    testMalwareTable += ",test-malware-simple";
+    if (val1 && val2) {
+      testMalwareTable += ",goog-unwanted-" + (isV2 ? "shavar" : "proto");
+      testMalwareTable += ",moztest-unwanted-simple";
+    }
+    Services.prefs.setCharPref("urlclassifier.malwareTable", testMalwareTable);
+
+    gBrowser.reload();
+    await BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+
+    let doc = gBrowser.selectedBrowser.contentDocument;
+    let checkbox = doc.getElementById("blockUncommonUnwanted");
+    let checked = checkbox.checked;
+    is(
+      checked,
+      val1 && val2,
+      "unwanted/uncommon preference is initialized correctly"
+    );
+
+    // scroll the checkbox into view, otherwise the synthesizeMouseAtCenter will be ignored, and click it
+    checkbox.scrollIntoView();
+    EventUtils.synthesizeMouseAtCenter(
+      checkbox,
+      {},
+      gBrowser.selectedBrowser.contentWindow
+    );
+
+    // check that both settings are now turned on or off
+    is(
+      Services.prefs.getBoolPref(
+        "browser.safebrowsing.downloads.remote.block_potentially_unwanted"
+      ),
+      !checked,
+      "block_potentially_unwanted is set correctly"
+    );
+    is(
+      Services.prefs.getBoolPref(
+        "browser.safebrowsing.downloads.remote.block_uncommon"
+      ),
+      !checked,
+      "block_uncommon is set correctly"
+    );
+
+    // when the preference is on, the malware table should include these ids
+    let malwareTable = Services.prefs
+      .getCharPref("urlclassifier.malwareTable")
+      .split(",");
+    if (isV2) {
+      is(
+        malwareTable.includes("goog-unwanted-shavar"),
+        !checked,
+        "malware table doesn't include goog-unwanted-shavar"
+      );
+    } else {
+      is(
+        malwareTable.includes("goog-unwanted-proto"),
+        !checked,
+        "malware table doesn't include goog-unwanted-proto"
+      );
+    }
+    is(
+      malwareTable.includes("moztest-unwanted-simple"),
+      !checked,
+      "malware table doesn't include moztest-unwanted-simple"
+    );
+    let sortedMalware = malwareTable.slice(0);
+    sortedMalware.sort();
+    Assert.deepEqual(
+      malwareTable,
+      sortedMalware,
+      "malware table has been sorted"
+    );
+  }
+
+  await checkPrefSwitch(true, true, false);
+  await checkPrefSwitch(false, true, false);
+  await checkPrefSwitch(true, false, false);
+  await checkPrefSwitch(false, false, false);
+  await checkPrefSwitch(true, true, true);
+  await checkPrefSwitch(false, true, true);
+  await checkPrefSwitch(true, false, true);
+  await checkPrefSwitch(false, false, true);
+});
diff --git a/browser/components/preferences/tests/browser_security-3.js b/browser/components/preferences/tests/browser_security-3.js
new file mode 100644
index 0000000000..75872d6629
--- /dev/null
+++ b/browser/components/preferences/tests/browser_security-3.js
@@ -0,0 +1,130 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_setup(async function () {
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  registerCleanupFunction(async function () {
+    Services.prefs.unlockPref("browser.safebrowsing.phishing.enabled");
+    Services.prefs.unlockPref("browser.safebrowsing.malware.enabled");
+    Services.prefs.unlockPref("browser.safebrowsing.downloads.enabled");
+    Services.prefs.unlockPref(
+      "browser.safebrowsing.downloads.remote.block_potentially_unwanted"
+    );
+    Services.prefs.unlockPref(
+      "browser.safebrowsing.downloads.remote.block_uncommon"
+    );
+    BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  });
+});
+
+// This test just reloads the preferences page for the various tests.
+add_task(async function () {
+  Services.prefs.lockPref("browser.safebrowsing.phishing.enabled");
+  Services.prefs.lockPref("browser.safebrowsing.malware.enabled");
+  Services.prefs.lockPref("browser.safebrowsing.downloads.enabled");
+  Services.prefs.lockPref(
+    "browser.safebrowsing.downloads.remote.block_potentially_unwanted"
+  );
+  Services.prefs.lockPref(
+    "browser.safebrowsing.downloads.remote.block_uncommon"
+  );
+
+  gBrowser.reload();
+  await BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  is(
+    doc.getElementById("enableSafeBrowsing").disabled,
+    true,
+    "Safe browsing should be disabled"
+  );
+  is(
+    doc.getElementById("blockDownloads").disabled,
+    true,
+    "Block downloads should be disabled"
+  );
+  is(
+    doc.getElementById("blockUncommonUnwanted").disabled,
+    true,
+    "Block common unwanted should be disabled"
+  );
+
+  Services.prefs.unlockPref("browser.safebrowsing.phishing.enabled");
+  Services.prefs.unlockPref("browser.safebrowsing.malware.enabled");
+
+  gBrowser.reload();
+  await BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+
+  doc = gBrowser.selectedBrowser.contentDocument;
+
+  let checkbox = doc.getElementById("enableSafeBrowsing");
+  checkbox.scrollIntoView();
+  EventUtils.synthesizeMouseAtCenter(
+    checkbox,
+    {},
+    gBrowser.selectedBrowser.contentWindow
+  );
+
+  is(
+    doc.getElementById("blockDownloads").disabled,
+    true,
+    "Block downloads should be disabled"
+  );
+  is(
+    doc.getElementById("blockUncommonUnwanted").disabled,
+    true,
+    "Block common unwanted should be disabled"
+  );
+
+  EventUtils.synthesizeMouseAtCenter(
+    checkbox,
+    {},
+    gBrowser.selectedBrowser.contentWindow
+  );
+
+  is(
+    doc.getElementById("blockDownloads").disabled,
+    true,
+    "Block downloads should be disabled"
+  );
+  is(
+    doc.getElementById("blockUncommonUnwanted").disabled,
+    true,
+    "Block common unwanted should be disabled"
+  );
+
+  Services.prefs.unlockPref("browser.safebrowsing.downloads.enabled");
+
+  gBrowser.reload();
+  await BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+
+  doc = gBrowser.selectedBrowser.contentDocument;
+
+  checkbox = doc.getElementById("blockDownloads");
+  checkbox.scrollIntoView();
+  EventUtils.synthesizeMouseAtCenter(
+    checkbox,
+    {},
+    gBrowser.selectedBrowser.contentWindow
+  );
+
+  is(
+    doc.getElementById("blockUncommonUnwanted").disabled,
+    true,
+    "Block common unwanted should be disabled"
+  );
+
+  EventUtils.synthesizeMouseAtCenter(
+    checkbox,
+    {},
+    gBrowser.selectedBrowser.contentWindow
+  );
+
+  is(
+    doc.getElementById("blockUncommonUnwanted").disabled,
+    true,
+    "Block common unwanted should be disabled"
+  );
+});
diff --git a/browser/components/preferences/tests/browser_site_login_exceptions.js b/browser/components/preferences/tests/browser_site_login_exceptions.js
new file mode 100644
index 0000000000..508232b234
--- /dev/null
+++ b/browser/components/preferences/tests/browser_site_login_exceptions.js
@@ -0,0 +1,101 @@
+"use strict";
+const PERMISSIONS_URL =
+  "chrome://browser/content/preferences/dialogs/permissions.xhtml";
+
+var exceptionsDialog;
+
+add_task(async function openLoginExceptionsSubDialog() {
+  // ensure rememberSignons is off for this test;
+  ok(
+    !Services.prefs.getBoolPref("signon.rememberSignons"),
+    "Check initial value of signon.rememberSignons pref"
+  );
+
+  // Undo the save password change.
+  registerCleanupFunction(async function () {
+    await SpecialPowers.spawn(gBrowser.selectedBrowser, [], function () {
+      let doc = content.document;
+      let savePasswordCheckBox = doc.getElementById("savePasswords");
+      if (savePasswordCheckBox.checked) {
+        savePasswordCheckBox.click();
+      }
+    });
+
+    gBrowser.removeCurrentTab();
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+
+  let dialogOpened = promiseLoadSubDialog(PERMISSIONS_URL);
+
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], function () {
+    let doc = content.document;
+    let savePasswordCheckBox = doc.getElementById("savePasswords");
+    Assert.ok(
+      !savePasswordCheckBox.checked,
+      "Save Password CheckBox should be unchecked by default"
+    );
+    savePasswordCheckBox.click();
+
+    let loginExceptionsButton = doc.getElementById("passwordExceptions");
+    loginExceptionsButton.click();
+  });
+
+  exceptionsDialog = await dialogOpened;
+});
+
+add_task(async function addALoginException() {
+  let doc = exceptionsDialog.document;
+
+  let richlistbox = doc.getElementById("permissionsBox");
+  Assert.equal(richlistbox.itemCount, 0, "Row count should initially be 0");
+
+  let inputBox = doc.getElementById("url");
+  inputBox.focus();
+
+  EventUtils.sendString("www.example.com", exceptionsDialog);
+
+  let btnBlock = doc.getElementById("btnBlock");
+  btnBlock.click();
+
+  await TestUtils.waitForCondition(() => richlistbox.itemCount == 2);
+
+  let expectedResult = ["http://www.example.com", "https://www.example.com"];
+  for (let website of expectedResult) {
+    let elements = richlistbox.getElementsByAttribute("origin", website);
+    is(elements.length, 1, "It should find only one coincidence");
+  }
+});
+
+add_task(async function deleteALoginException() {
+  let doc = exceptionsDialog.document;
+
+  let richlistbox = doc.getElementById("permissionsBox");
+  let currentItems = 2;
+  Assert.equal(
+    richlistbox.itemCount,
+    currentItems,
+    `Row count should initially be ${currentItems}`
+  );
+  richlistbox.focus();
+
+  while (richlistbox.itemCount) {
+    richlistbox.selectedIndex = 0;
+
+    if (AppConstants.platform == "macosx") {
+      EventUtils.synthesizeKey("KEY_Backspace");
+    } else {
+      EventUtils.synthesizeKey("KEY_Delete");
+    }
+
+    currentItems -= 1;
+
+    await TestUtils.waitForCondition(
+      () => richlistbox.itemCount == currentItems
+    );
+    is_element_visible(
+      content.gSubDialog._dialogs[0]._box,
+      "Subdialog is visible after deleting an element"
+    );
+  }
+});
diff --git a/browser/components/preferences/tests/browser_site_login_exceptions_policy.js b/browser/components/preferences/tests/browser_site_login_exceptions_policy.js
new file mode 100644
index 0000000000..10f5039c6f
--- /dev/null
+++ b/browser/components/preferences/tests/browser_site_login_exceptions_policy.js
@@ -0,0 +1,65 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { EnterprisePolicyTesting } = ChromeUtils.importESModule(
+  "resource://testing-common/EnterprisePolicyTesting.sys.mjs"
+);
+
+const PERMISSIONS_URL =
+  "chrome://browser/content/preferences/dialogs/permissions.xhtml";
+
+var exceptionsDialog;
+
+add_task(async function openLoginExceptionsSubDialog() {
+  // ensure rememberSignons is off for this test;
+  ok(
+    !Services.prefs.getBoolPref("signon.rememberSignons"),
+    "Check initial value of signon.rememberSignons pref"
+  );
+
+  // Undo the save password change.
+  registerCleanupFunction(async function () {
+    await SpecialPowers.spawn(gBrowser.selectedBrowser, [], function () {
+      let doc = content.document;
+      let savePasswordCheckBox = doc.getElementById("savePasswords");
+      if (savePasswordCheckBox.checked) {
+        savePasswordCheckBox.click();
+      }
+    });
+
+    gBrowser.removeCurrentTab();
+    await EnterprisePolicyTesting.setupPolicyEngineWithJson("");
+  });
+
+  await EnterprisePolicyTesting.setupPolicyEngineWithJson({
+    policies: {
+      PasswordManagerExceptions: ["https://pwexception.example.com"],
+    },
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+
+  let dialogOpened = promiseLoadSubDialog(PERMISSIONS_URL);
+
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], function () {
+    let doc = content.document;
+    let savePasswordCheckBox = doc.getElementById("savePasswords");
+    savePasswordCheckBox.click();
+
+    let loginExceptionsButton = doc.getElementById("passwordExceptions");
+    loginExceptionsButton.click();
+  });
+
+  exceptionsDialog = await dialogOpened;
+
+  let doc = exceptionsDialog.document;
+
+  let richlistbox = doc.getElementById("permissionsBox");
+  Assert.equal(richlistbox.itemCount, 1, `Row count should initially be 1`);
+
+  richlistbox.focus();
+  richlistbox.selectedIndex = 0;
+  Assert.ok(doc.getElementById("removePermission").disabled);
+});
diff --git a/browser/components/preferences/tests/browser_spotlight.js b/browser/components/preferences/tests/browser_spotlight.js
new file mode 100644
index 0000000000..4a1aae7ec1
--- /dev/null
+++ b/browser/components/preferences/tests/browser_spotlight.js
@@ -0,0 +1,72 @@
+add_task(async function test_openPreferences_spotlight() {
+  for (let [arg, expectedPane, expectedHash, expectedSubcategory] of [
+    ["privacy-reports", "panePrivacy", "#privacy", "reports"],
+    ["privacy-address-autofill", "panePrivacy", "#privacy", "address-autofill"],
+    [
+      "privacy-credit-card-autofill",
+      "panePrivacy",
+      "#privacy",
+      "credit-card-autofill",
+    ],
+    ["privacy-form-autofill", "panePrivacy", "#privacy", "form-autofill"],
+    ["privacy-logins", "panePrivacy", "#privacy", "logins"],
+    [
+      "privacy-trackingprotection",
+      "panePrivacy",
+      "#privacy",
+      "trackingprotection",
+    ],
+    [
+      "privacy-permissions-block-popups",
+      "panePrivacy",
+      "#privacy",
+      "permissions-block-popups",
+    ],
+  ]) {
+    if (
+      arg == "privacy-credit-card-autofill" &&
+      Services.prefs.getCharPref(
+        "extensions.formautofill.creditCards.supported"
+      ) == "off"
+    ) {
+      continue;
+    }
+    if (
+      arg == "privacy-address-autofill" &&
+      Services.prefs.getCharPref(
+        "extensions.formautofill.addresses.supported"
+      ) == "off"
+    ) {
+      continue;
+    }
+
+    let prefs = await openPreferencesViaOpenPreferencesAPI(arg, {
+      leaveOpen: true,
+    });
+    is(prefs.selectedPane, expectedPane, "The right pane is selected");
+    let doc = gBrowser.contentDocument;
+    is(
+      doc.location.hash,
+      expectedHash,
+      "The subcategory should be removed from the URI"
+    );
+    await TestUtils.waitForCondition(
+      () => doc.querySelector(".spotlight"),
+      "Wait for the spotlight"
+    );
+    is(
+      doc.querySelector(".spotlight").getAttribute("data-subcategory"),
+      expectedSubcategory,
+      "The right subcategory is spotlighted"
+    );
+
+    doc.defaultView.spotlight(null);
+    is(
+      doc.querySelector(".spotlight"),
+      null,
+      "The spotlighted section is cleared"
+    );
+
+    BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  }
+});
diff --git a/browser/components/preferences/tests/browser_statePartitioning_PBM_strings.js b/browser/components/preferences/tests/browser_statePartitioning_PBM_strings.js
new file mode 100644
index 0000000000..d941333f8f
--- /dev/null
+++ b/browser/components/preferences/tests/browser_statePartitioning_PBM_strings.js
@@ -0,0 +1,124 @@
+"use strict";
+
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const COOKIE_BEHAVIOR_PREF = "network.cookie.cookieBehavior";
+const COOKIE_BEHAVIOR_PBM_PREF = "network.cookie.cookieBehavior.pbmode";
+
+const CB_STRICT_FEATURES_PREF = "browser.contentblocking.features.strict";
+const FPI_PREF = "privacy.firstparty.isolate";
+
+async function testCookieBlockingInfoStandard(
+  cookieBehavior,
+  cookieBehaviorPBM,
+  isShown
+) {
+  let defaults = Services.prefs.getDefaultBranch("");
+  defaults.setIntPref(COOKIE_BEHAVIOR_PREF, cookieBehavior);
+  defaults.setIntPref(COOKIE_BEHAVIOR_PBM_PREF, cookieBehaviorPBM);
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+
+  let doc = gBrowser.contentDocument;
+
+  // Select standard mode.
+  let standardRadioOption = doc.getElementById("standardRadio");
+  standardRadioOption.click();
+
+  // Check the cookie blocking info for private windows for standard mode.
+  let elts = doc.querySelectorAll(
+    "#contentBlockingOptionStandard .extra-information-label.all-third-party-cookies-private-windows-option"
+  );
+  for (let elt of elts) {
+    is(
+      elt.hidden,
+      !isShown,
+      `The visibility of cookie blocking info for standard mode is correct`
+    );
+  }
+
+  gBrowser.removeCurrentTab();
+}
+
+async function testCookieBlockingInfoStrict(
+  contentBlockingStrictFeatures,
+  isShown
+) {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [CB_STRICT_FEATURES_PREF, contentBlockingStrictFeatures],
+      [FPI_PREF, false],
+    ],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+
+  let doc = gBrowser.contentDocument;
+
+  // Select strict mode.
+  let strictRadioOption = doc.getElementById("strictRadio");
+  strictRadioOption.click();
+
+  // Check the cookie blocking info for private windows for strict mode.
+  let elts = doc.querySelectorAll(
+    "#contentBlockingOptionStrict .extra-information-label.all-third-party-cookies-private-windows-option"
+  );
+  for (let elt of elts) {
+    is(
+      elt.hidden,
+      !isShown,
+      `The cookie blocking info is hidden for strict mode`
+    );
+  }
+
+  gBrowser.removeCurrentTab();
+}
+
+add_task(async function runTests() {
+  await SpecialPowers.pushPrefEnv({
+    set: [[FPI_PREF, false]],
+  });
+
+  let defaults = Services.prefs.getDefaultBranch("");
+  let originalCookieBehavior = defaults.getIntPref(COOKIE_BEHAVIOR_PREF);
+  let originalCookieBehaviorPBM = defaults.getIntPref(COOKIE_BEHAVIOR_PBM_PREF);
+
+  // Test if the cookie blocking info for state partitioning in PBM is
+  // shown in standard mode if the regular cookieBehavior is
+  // BEHAVIOR_REJECT_TRACKER and the private cookieBehavior is
+  // BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN
+  await testCookieBlockingInfoStandard(
+    Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER,
+    Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN,
+    true
+  );
+
+  // Test if the cookie blocking info is hidden in standard mode if both
+  // cookieBehaviors are the same.
+  await testCookieBlockingInfoStandard(
+    Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN,
+    Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN,
+    false
+  );
+
+  // Test if the cookie blocking info is hidden for strict mode if
+  // cookieBehaviors both are BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN in
+  // the strict feature value.
+  await testCookieBlockingInfoStrict(
+    "tp,tpPrivate,cookieBehavior5,cookieBehaviorPBM5,cm,fp,stp,emailTP,emailTPPrivate,lvl2,rp,rpTop,ocsp,fpp,fppPrivate",
+    false
+  );
+
+  // Test if the cookie blocking info is shown for strict mode if the regular
+  // cookieBehavior is BEHAVIOR_REJECT_TRACKER and the private cookieBehavior is
+  // BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN
+  await testCookieBlockingInfoStrict(
+    "tp,tpPrivate,cookieBehavior4,cookieBehaviorPBM5,cm,fp,stp,emailTP,emailTPPrivate,lvl2,rp,rpTop,ocsp,fpp,fppPrivate",
+    true
+  );
+
+  defaults.setIntPref(COOKIE_BEHAVIOR_PREF, originalCookieBehavior);
+  defaults.setIntPref(COOKIE_BEHAVIOR_PBM_PREF, originalCookieBehaviorPBM);
+  await SpecialPowers.popPrefEnv();
+});
diff --git a/browser/components/preferences/tests/browser_statePartitioning_strings.js b/browser/components/preferences/tests/browser_statePartitioning_strings.js
new file mode 100644
index 0000000000..aed7e26977
--- /dev/null
+++ b/browser/components/preferences/tests/browser_statePartitioning_strings.js
@@ -0,0 +1,79 @@
+"use strict";
+
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const CB_STRICT_FEATURES_PREF = "browser.contentblocking.features.strict";
+const CB_STRICT_FEATURES_VALUE = "tp,tpPrivate,cookieBehavior5,cm,fp,stp,lvl2";
+const FPI_PREF = "privacy.firstparty.isolate";
+const COOKIE_BEHAVIOR_PREF = "network.cookie.cookieBehavior";
+const COOKIE_BEHAVIOR_VALUE = 5;
+
+async function testStrings() {
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+
+  let doc = gBrowser.contentDocument;
+
+  // Check the cookie blocking info strings
+  let elts = doc.querySelectorAll(
+    ".extra-information-label.cross-site-cookies-option"
+  );
+  for (let elt of elts) {
+    ok(!elt.hidden, "The new cross-site cookies info label is visible");
+  }
+
+  // Check the learn more strings
+  elts = doc.querySelectorAll(
+    ".tail-with-learn-more.content-blocking-warning-description"
+  );
+  for (let elt of elts) {
+    let id = doc.l10n.getAttributes(elt).id;
+    is(
+      id,
+      "content-blocking-and-isolating-etp-warning-description-2",
+      "The correct warning description string is in use"
+    );
+  }
+
+  // Check the cookie blocking mode menu option string
+  let elt = doc.querySelector("#isolateCookiesSocialMedia");
+  let id = doc.l10n.getAttributes(elt).id;
+  is(
+    id,
+    "sitedata-option-block-cross-site-cookies",
+    "The correct string is in use for the cookie blocking option"
+  );
+
+  // Check the FPI warning is hidden with FPI off
+  let warningElt = doc.getElementById("fpiIncompatibilityWarning");
+  is(warningElt.hidden, true, "The FPI warning is hidden");
+
+  gBrowser.removeCurrentTab();
+
+  // Check the FPI warning is shown only if MVP UI is enabled when FPI is on
+  await SpecialPowers.pushPrefEnv({ set: [[FPI_PREF, true]] });
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  doc = gBrowser.contentDocument;
+  warningElt = doc.getElementById("fpiIncompatibilityWarning");
+  ok(!warningElt.hidden, `The FPI warning is visible`);
+  await SpecialPowers.popPrefEnv();
+
+  gBrowser.removeCurrentTab();
+}
+
+add_task(async function runTests() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [CB_STRICT_FEATURES_PREF, CB_STRICT_FEATURES_VALUE],
+      [FPI_PREF, false],
+    ],
+  });
+  let defaults = Services.prefs.getDefaultBranch("");
+  let originalCookieBehavior = defaults.getIntPref(COOKIE_BEHAVIOR_PREF);
+  defaults.setIntPref(COOKIE_BEHAVIOR_PREF, COOKIE_BEHAVIOR_VALUE);
+  registerCleanupFunction(() => {
+    defaults.setIntPref(COOKIE_BEHAVIOR_PREF, originalCookieBehavior);
+  });
+
+  await testStrings();
+});
diff --git a/browser/components/preferences/tests/browser_subdialogs.js b/browser/components/preferences/tests/browser_subdialogs.js
new file mode 100644
index 0000000000..8763ae9146
--- /dev/null
+++ b/browser/components/preferences/tests/browser_subdialogs.js
@@ -0,0 +1,659 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests for the sub-dialog infrastructure, not for actual sub-dialog functionality.
+ */
+
+const gDialogURL = getRootDirectory(gTestPath) + "subdialog.xhtml";
+const gDialogURL2 = getRootDirectory(gTestPath) + "subdialog2.xhtml";
+
+function open_subdialog_and_test_generic_start_state(
+  browser,
+  domcontentloadedFn,
+  url = gDialogURL
+) {
+  let domcontentloadedFnStr = domcontentloadedFn
+    ? "(" + domcontentloadedFn.toString() + ")()"
+    : "";
+  return SpecialPowers.spawn(
+    browser,
+    [{ url, domcontentloadedFnStr }],
+    async function (args) {
+      let rv = { acceptCount: 0 };
+      let win = content.window;
+      content.gSubDialog.open(args.url, undefined, rv);
+      let subdialog = content.gSubDialog._topDialog;
+
+      info("waiting for subdialog DOMFrameContentLoaded");
+      let dialogOpenPromise;
+      await new Promise(resolve => {
+        win.addEventListener(
+          "DOMFrameContentLoaded",
+          function frameContentLoaded(ev) {
+            // We can get events for loads in other frames, so we have to filter
+            // those out.
+            if (ev.target != subdialog._frame) {
+              return;
+            }
+            win.removeEventListener(
+              "DOMFrameContentLoaded",
+              frameContentLoaded
+            );
+            dialogOpenPromise = ContentTaskUtils.waitForEvent(
+              subdialog._overlay,
+              "dialogopen"
+            );
+            resolve();
+          },
+          { capture: true }
+        );
+      });
+      let result;
+      if (args.domcontentloadedFnStr) {
+        // eslint-disable-next-line no-eval
+        result = eval(args.domcontentloadedFnStr);
+      }
+
+      info("waiting for subdialog load");
+      await dialogOpenPromise;
+      info("subdialog window is loaded");
+
+      let expectedStyleSheetURLs = subdialog._injectedStyleSheets;
+      let foundStyleSheetURLs = Array.from(
+        subdialog._frame.contentDocument.styleSheets,
+        s => s.href
+      );
+
+      Assert.greaterOrEqual(
+        expectedStyleSheetURLs.length,
+        0,
+        "Should be at least one injected stylesheet."
+      );
+      // We can't test that the injected stylesheets come later if those are
+      // the only ones. If this test fails it indicates the test needs to be
+      // changed somehow.
+      Assert.greater(
+        foundStyleSheetURLs.length,
+        expectedStyleSheetURLs.length,
+        "Should see at least all one additional stylesheet from the document."
+      );
+
+      // The expected stylesheets should be at the end of the list of loaded
+      // stylesheets.
+      foundStyleSheetURLs = foundStyleSheetURLs.slice(
+        foundStyleSheetURLs.length - expectedStyleSheetURLs.length
+      );
+
+      Assert.deepEqual(
+        foundStyleSheetURLs,
+        expectedStyleSheetURLs,
+        "Should have seen the injected stylesheets in the correct order"
+      );
+
+      Assert.ok(
+        !!subdialog._frame.contentWindow,
+        "The dialog should be non-null"
+      );
+      Assert.notEqual(
+        subdialog._frame.contentWindow.location.toString(),
+        "about:blank",
+        "Subdialog URL should not be about:blank"
+      );
+      Assert.equal(
+        win.getComputedStyle(subdialog._overlay).visibility,
+        "visible",
+        "Overlay should be visible"
+      );
+
+      return result;
+    }
+  );
+}
+
+async function close_subdialog_and_test_generic_end_state(
+  browser,
+  closingFn,
+  closingButton,
+  acceptCount,
+  options
+) {
+  let getDialogsCount = () => {
+    return SpecialPowers.spawn(
+      browser,
+      [],
+      () => content.window.gSubDialog._dialogs.length
+    );
+  };
+  let getStackChildrenCount = () => {
+    return SpecialPowers.spawn(
+      browser,
+      [],
+      () => content.window.gSubDialog._dialogStack.children.length
+    );
+  };
+  let dialogclosingPromise = SpecialPowers.spawn(
+    browser,
+    [{ closingButton, acceptCount }],
+    async function (expectations) {
+      let win = content.window;
+      let subdialog = win.gSubDialog._topDialog;
+      let frame = subdialog._frame;
+
+      let frameWinUnload = ContentTaskUtils.waitForEvent(
+        frame.contentWindow,
+        "unload",
+        true
+      );
+
+      let actualAcceptCount;
+      info("waiting for dialogclosing");
+      info("URI " + frame.currentURI?.spec);
+      let closingEvent = await ContentTaskUtils.waitForEvent(
+        frame.contentWindow,
+        "dialogclosing",
+        true,
+        () => {
+          actualAcceptCount = frame.contentWindow?.arguments[0].acceptCount;
+          return true;
+        }
+      );
+
+      info("Waiting for subdialog unload");
+      await frameWinUnload;
+
+      let contentClosingButton = closingEvent.detail.button;
+
+      Assert.notEqual(
+        win.getComputedStyle(subdialog._overlay).visibility,
+        "visible",
+        "overlay is not visible"
+      );
+      Assert.equal(
+        frame.getAttribute("style"),
+        "",
+        "inline styles should be cleared"
+      );
+      Assert.equal(
+        contentClosingButton,
+        expectations.closingButton,
+        "closing event should indicate button was '" +
+          expectations.closingButton +
+          "'"
+      );
+      Assert.equal(
+        actualAcceptCount,
+        expectations.acceptCount,
+        "should be 1 if accepted, 0 if canceled, undefined if closed w/out button"
+      );
+    }
+  );
+  let initialDialogsCount = await getDialogsCount();
+  let initialStackChildrenCount = await getStackChildrenCount();
+  if (options && options.runClosingFnOutsideOfContentTask) {
+    await closingFn();
+  } else {
+    SpecialPowers.spawn(browser, [], closingFn);
+  }
+
+  await dialogclosingPromise;
+  let endDialogsCount = await getDialogsCount();
+  let endStackChildrenCount = await getStackChildrenCount();
+  Assert.equal(
+    initialDialogsCount - 1,
+    endDialogsCount,
+    "dialog count should decrease by 1"
+  );
+  Assert.equal(
+    initialStackChildrenCount - 1,
+    endStackChildrenCount,
+    "stack children count should decrease by 1"
+  );
+}
+
+let tab;
+
+add_task(async function test_initialize() {
+  tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:preferences"
+  );
+});
+
+add_task(
+  async function check_titlebar_focus_returnval_titlechanges_accepting() {
+    await open_subdialog_and_test_generic_start_state(tab.linkedBrowser);
+
+    let domtitlechangedPromise = BrowserTestUtils.waitForEvent(
+      tab.linkedBrowser,
+      "DOMTitleChanged"
+    );
+    await SpecialPowers.spawn(tab.linkedBrowser, [], async function () {
+      let dialog = content.window.gSubDialog._topDialog;
+      let dialogWin = dialog._frame.contentWindow;
+      let dialogTitleElement = dialog._titleElement;
+      Assert.equal(
+        dialogTitleElement.textContent,
+        "Sample sub-dialog",
+        "Title should be correct initially"
+      );
+      Assert.equal(
+        dialogWin.document.activeElement.value,
+        "Default text",
+        "Textbox with correct text is focused"
+      );
+      dialogWin.document.title = "Updated title";
+    });
+
+    info("waiting for DOMTitleChanged event");
+    await domtitlechangedPromise;
+
+    SpecialPowers.spawn(tab.linkedBrowser, [], async function () {
+      let dialogTitleElement =
+        content.window.gSubDialog._topDialog._titleElement;
+      Assert.equal(
+        dialogTitleElement.textContent,
+        "Updated title",
+        "subdialog should have updated title"
+      );
+    });
+
+    // Accept the dialog
+    await close_subdialog_and_test_generic_end_state(
+      tab.linkedBrowser,
+      function () {
+        content.window.gSubDialog._topDialog._frame.contentDocument
+          .getElementById("subDialog")
+          .acceptDialog();
+      },
+      "accept",
+      1
+    );
+  }
+);
+
+add_task(async function check_canceling_dialog() {
+  await open_subdialog_and_test_generic_start_state(tab.linkedBrowser);
+
+  info("canceling the dialog");
+  await close_subdialog_and_test_generic_end_state(
+    tab.linkedBrowser,
+    function () {
+      content.window.gSubDialog._topDialog._frame.contentDocument
+        .getElementById("subDialog")
+        .cancelDialog();
+    },
+    "cancel",
+    0
+  );
+});
+
+add_task(async function check_reopening_dialog() {
+  await open_subdialog_and_test_generic_start_state(tab.linkedBrowser);
+  info("opening another dialog which will close the first");
+  await open_subdialog_and_test_generic_start_state(
+    tab.linkedBrowser,
+    "",
+    gDialogURL2
+  );
+
+  SpecialPowers.spawn(tab.linkedBrowser, [], async function () {
+    let win = content.window;
+    let dialogs = win.gSubDialog._dialogs;
+    let lowerDialog = dialogs[0];
+    let topDialog = dialogs[1];
+    Assert.equal(dialogs.length, 2, "There should be two visible dialogs");
+    Assert.equal(
+      win.getComputedStyle(topDialog._overlay).visibility,
+      "visible",
+      "The top dialog should be visible"
+    );
+    Assert.equal(
+      win.getComputedStyle(lowerDialog._overlay).visibility,
+      "visible",
+      "The lower dialog should be visible"
+    );
+    Assert.equal(
+      win.getComputedStyle(topDialog._overlay).backgroundColor,
+      "rgba(0, 0, 0, 0.5)",
+      "The top dialog should have a semi-transparent overlay"
+    );
+    Assert.equal(
+      win.getComputedStyle(lowerDialog._overlay).backgroundColor,
+      "rgba(0, 0, 0, 0)",
+      "The lower dialog should not have an overlay"
+    );
+  });
+
+  info("closing two dialogs");
+  await close_subdialog_and_test_generic_end_state(
+    tab.linkedBrowser,
+    function () {
+      content.window.gSubDialog._topDialog._frame.contentDocument
+        .getElementById("subDialog")
+        .acceptDialog();
+    },
+    "accept",
+    1
+  );
+  await close_subdialog_and_test_generic_end_state(
+    tab.linkedBrowser,
+    function () {
+      content.window.gSubDialog._topDialog._frame.contentDocument
+        .getElementById("subDialog")
+        .acceptDialog();
+    },
+    "accept",
+    1
+  );
+});
+
+add_task(async function check_opening_while_closing() {
+  await open_subdialog_and_test_generic_start_state(tab.linkedBrowser);
+  info("closing");
+  content.window.gSubDialog._topDialog.close();
+  info("reopening immediately after calling .close()");
+  await open_subdialog_and_test_generic_start_state(tab.linkedBrowser);
+  await close_subdialog_and_test_generic_end_state(
+    tab.linkedBrowser,
+    function () {
+      content.window.gSubDialog._topDialog._frame.contentDocument
+        .getElementById("subDialog")
+        .acceptDialog();
+    },
+    "accept",
+    1
+  );
+});
+
+add_task(async function window_close_on_dialog() {
+  await open_subdialog_and_test_generic_start_state(tab.linkedBrowser);
+
+  info("canceling the dialog");
+  await close_subdialog_and_test_generic_end_state(
+    tab.linkedBrowser,
+    function () {
+      content.window.gSubDialog._topDialog._frame.contentWindow.close();
+    },
+    null,
+    0
+  );
+});
+
+add_task(async function click_close_button_on_dialog() {
+  await open_subdialog_and_test_generic_start_state(tab.linkedBrowser);
+
+  info("canceling the dialog");
+  await close_subdialog_and_test_generic_end_state(
+    tab.linkedBrowser,
+    function () {
+      return BrowserTestUtils.synthesizeMouseAtCenter(
+        ".dialogClose",
+        {},
+        tab.linkedBrowser
+      );
+    },
+    null,
+    0,
+    { runClosingFnOutsideOfContentTask: true }
+  );
+});
+
+add_task(async function background_click_should_close_dialog() {
+  await open_subdialog_and_test_generic_start_state(tab.linkedBrowser);
+
+  // Clicking on an inactive part of dialog itself should not close the dialog.
+  // Click the dialog title bar here to make sure nothing happens.
+  info("clicking the dialog title bar");
+  BrowserTestUtils.synthesizeMouseAtCenter(
+    ".dialogTitle",
+    {},
+    tab.linkedBrowser
+  );
+
+  // Close the dialog by clicking on the overlay background. Simulate a click
+  // at point (2,2) instead of (0,0) so we are sure we're clicking on the
+  // overlay background instead of some boundary condition that a real user
+  // would never click.
+  info("clicking the overlay background");
+  await close_subdialog_and_test_generic_end_state(
+    tab.linkedBrowser,
+    function () {
+      return BrowserTestUtils.synthesizeMouseAtPoint(
+        2,
+        2,
+        {},
+        tab.linkedBrowser
+      );
+    },
+    null,
+    0,
+    { runClosingFnOutsideOfContentTask: true }
+  );
+});
+
+add_task(async function escape_should_close_dialog() {
+  await open_subdialog_and_test_generic_start_state(tab.linkedBrowser);
+
+  info("canceling the dialog");
+  await close_subdialog_and_test_generic_end_state(
+    tab.linkedBrowser,
+    function () {
+      return BrowserTestUtils.synthesizeKey("VK_ESCAPE", {}, tab.linkedBrowser);
+    },
+    "cancel",
+    0,
+    { runClosingFnOutsideOfContentTask: true }
+  );
+});
+
+add_task(async function correct_width_and_height_should_be_used_for_dialog() {
+  await open_subdialog_and_test_generic_start_state(tab.linkedBrowser);
+
+  await SpecialPowers.spawn(tab.linkedBrowser, [], async function () {
+    function fuzzyEqual(value, expectedValue, fuzz, msg) {
+      Assert.greaterOrEqual(expectedValue + fuzz, value, msg);
+      Assert.lessOrEqual(expectedValue - fuzz, value, msg);
+    }
+    let topDialog = content.gSubDialog._topDialog;
+    let frameStyle = content.getComputedStyle(topDialog._frame);
+    let dialogStyle = topDialog.frameContentWindow.getComputedStyle(
+      topDialog.frameContentWindow.document.documentElement
+    );
+    let fontSize = parseFloat(dialogStyle.fontSize);
+    let height = parseFloat(frameStyle.height);
+    let width = parseFloat(frameStyle.width);
+
+    fuzzyEqual(
+      width,
+      fontSize * 32,
+      2,
+      "Width should be set on the frame from the dialog"
+    );
+    fuzzyEqual(
+      height,
+      fontSize * 5,
+      2,
+      "Height should be set on the frame from the dialog"
+    );
+  });
+
+  await close_subdialog_and_test_generic_end_state(
+    tab.linkedBrowser,
+    function () {
+      content.window.gSubDialog._topDialog._frame.contentWindow.close();
+    },
+    null,
+    0
+  );
+});
+
+add_task(
+  async function wrapped_text_in_dialog_should_have_expected_scrollHeight() {
+    let oldHeight = await open_subdialog_and_test_generic_start_state(
+      tab.linkedBrowser,
+      function domcontentloadedFn() {
+        let frame = content.window.gSubDialog._topDialog._frame;
+        let doc = frame.contentDocument;
+        let scrollHeight = doc.documentElement.scrollHeight;
+        doc.documentElement.style.removeProperty("height");
+        doc.getElementById("desc").textContent = `
+      Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque
+      laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi
+      architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas
+      sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione
+      laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi
+      architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas
+      sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione
+      laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi
+      architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas
+      sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione
+      voluptatem sequi nesciunt.`;
+        return scrollHeight;
+      }
+    );
+
+    await SpecialPowers.spawn(
+      tab.linkedBrowser,
+      [oldHeight],
+      async function (contentOldHeight) {
+        function fuzzyEqual(value, expectedValue, fuzz, msg) {
+          Assert.greaterOrEqual(expectedValue + fuzz, value, msg);
+          Assert.lessOrEqual(expectedValue - fuzz, value, msg);
+        }
+        let topDialog = content.gSubDialog._topDialog;
+        let frame = topDialog._frame;
+        let frameStyle = content.getComputedStyle(frame);
+        let docEl = frame.contentDocument.documentElement;
+        let dialogStyle = topDialog.frameContentWindow.getComputedStyle(docEl);
+        let fontSize = parseFloat(dialogStyle.fontSize);
+        let height = parseFloat(frameStyle.height);
+        let width = parseFloat(frameStyle.width);
+
+        fuzzyEqual(
+          width,
+          32 * fontSize,
+          2,
+          "Width should be set on the frame from the dialog"
+        );
+        Assert.ok(
+          docEl.scrollHeight > contentOldHeight,
+          "Content height increased (from " +
+            contentOldHeight +
+            " to " +
+            docEl.scrollHeight +
+            ")."
+        );
+        fuzzyEqual(
+          height,
+          docEl.scrollHeight,
+          2,
+          "Height on the frame should be higher now. " +
+            "This test may fail on certain screen resoluition. " +
+            "See bug 1420576 and bug 1205717."
+        );
+      }
+    );
+
+    await close_subdialog_and_test_generic_end_state(
+      tab.linkedBrowser,
+      function () {
+        content.window.gSubDialog._topDialog._frame.contentWindow.window.close();
+      },
+      null,
+      0
+    );
+  }
+);
+
+add_task(async function dialog_too_tall_should_get_reduced_in_height() {
+  await open_subdialog_and_test_generic_start_state(
+    tab.linkedBrowser,
+    function domcontentloadedFn() {
+      let frame = content.window.gSubDialog._topDialog._frame;
+      frame.contentDocument.documentElement.style.height = "100000px";
+    }
+  );
+
+  await SpecialPowers.spawn(tab.linkedBrowser, [], async function () {
+    function fuzzyEqual(value, expectedValue, fuzz, msg) {
+      Assert.greaterOrEqual(expectedValue + fuzz, value, msg);
+      Assert.lessOrEqual(expectedValue - fuzz, value, msg);
+    }
+    let topDialog = content.gSubDialog._topDialog;
+    let frame = topDialog._frame;
+    let frameStyle = content.getComputedStyle(frame);
+    let dialogStyle = topDialog.frameContentWindow.getComputedStyle(
+      frame.contentDocument.documentElement
+    );
+    let fontSize = parseFloat(dialogStyle.fontSize);
+    let height = parseFloat(frameStyle.height);
+    let width = parseFloat(frameStyle.width);
+    fuzzyEqual(
+      width,
+      32 * fontSize,
+      2,
+      "Width should be set on the frame from the dialog"
+    );
+    Assert.less(
+      height,
+      content.window.innerHeight,
+      "Height on the frame should be smaller than window's innerHeight"
+    );
+  });
+
+  await close_subdialog_and_test_generic_end_state(
+    tab.linkedBrowser,
+    function () {
+      content.window.gSubDialog._topDialog._frame.contentWindow.window.close();
+    },
+    null,
+    0
+  );
+});
+
+add_task(
+  async function scrollWidth_and_scrollHeight_from_subdialog_should_size_the_browser() {
+    await open_subdialog_and_test_generic_start_state(
+      tab.linkedBrowser,
+      function domcontentloadedFn() {
+        let frame = content.window.gSubDialog._topDialog._frame;
+        frame.contentDocument.documentElement.style.removeProperty("height");
+        frame.contentDocument.documentElement.style.removeProperty("width");
+      }
+    );
+
+    await SpecialPowers.spawn(tab.linkedBrowser, [], async function () {
+      let frame = content.window.gSubDialog._topDialog._frame;
+      Assert.ok(
+        frame.style.width.endsWith("px"),
+        "Width (" +
+          frame.style.width +
+          ") should be set to a px value of the scrollWidth from the dialog"
+      );
+      let cs = content.getComputedStyle(frame);
+      Assert.stringMatches(
+        cs.getPropertyValue("--subdialog-inner-height"),
+        /px$/,
+        "Height (" +
+          cs.getPropertyValue("--subdialog-inner-height") +
+          ") should be set to a px value of the scrollHeight from the dialog"
+      );
+    });
+
+    await close_subdialog_and_test_generic_end_state(
+      tab.linkedBrowser,
+      function () {
+        content.window.gSubDialog._topDialog._frame.contentWindow.window.close();
+      },
+      null,
+      0
+    );
+  }
+);
+
+add_task(async function test_shutdown() {
+  gBrowser.removeTab(tab);
+});
diff --git a/browser/components/preferences/tests/browser_sync_chooseWhatToSync.js b/browser/components/preferences/tests/browser_sync_chooseWhatToSync.js
new file mode 100644
index 0000000000..b36d9ecea3
--- /dev/null
+++ b/browser/components/preferences/tests/browser_sync_chooseWhatToSync.js
@@ -0,0 +1,178 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { UIState } = ChromeUtils.importESModule(
+  "resource://services-sync/UIState.sys.mjs"
+);
+
+// This obj will be used in both tests
+// First test makes sure accepting the preferences matches these values
+// Second test makes sure the cancel dialog STILL matches these values
+const syncPrefs = {
+  "services.sync.engine.addons": false,
+  "services.sync.engine.bookmarks": true,
+  "services.sync.engine.history": true,
+  "services.sync.engine.tabs": false,
+  "services.sync.engine.prefs": false,
+  "services.sync.engine.passwords": false,
+  "services.sync.engine.addresses": false,
+  "services.sync.engine.creditcards": false,
+};
+
+add_setup(async () => {
+  UIState._internal.notifyStateUpdated = () => {};
+  const origNotifyStateUpdated = UIState._internal.notifyStateUpdated;
+  const origGet = UIState.get;
+  UIState.get = () => {
+    return { status: UIState.STATUS_SIGNED_IN, email: "foo@bar.com" };
+  };
+
+  registerCleanupFunction(() => {
+    UIState._internal.notifyStateUpdated = origNotifyStateUpdated;
+    UIState.get = origGet;
+  });
+});
+
+/**
+ * We don't actually enable sync here, but we just check that the preferences are correct
+ * when the callback gets hit (accepting/cancelling the dialog)
+ * See https://bugzilla.mozilla.org/show_bug.cgi?id=1584132.
+ */
+
+add_task(async function testDialogAccept() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["identity.fxaccounts.enabled", true]],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+
+  // This will check if the callback was actually called during the test
+  let callbackCalled = false;
+
+  // Enabling all the sync UI is painful in tests, so we just open the dialog manually
+  let syncWindow = await openAndLoadSubDialog(
+    "chrome://browser/content/preferences/dialogs/syncChooseWhatToSync.xhtml",
+    null,
+    {},
+    () => {
+      for (const [prefKey, prefValue] of Object.entries(syncPrefs)) {
+        Assert.equal(
+          Services.prefs.getBoolPref(prefKey),
+          prefValue,
+          `${prefValue} is expected value`
+        );
+      }
+      callbackCalled = true;
+    }
+  );
+
+  Assert.ok(syncWindow, "Choose what to sync window opened");
+  let syncChooseDialog =
+    syncWindow.document.getElementById("syncChooseOptions");
+  let syncCheckboxes = syncChooseDialog.querySelectorAll(
+    "checkbox[preference]"
+  );
+
+  // Adjust the checkbox values to the expectedValues in the list
+  [...syncCheckboxes].forEach(checkbox => {
+    if (syncPrefs[checkbox.getAttribute("preference")] !== checkbox.checked) {
+      checkbox.click();
+    }
+  });
+
+  syncChooseDialog.acceptDialog();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  Assert.ok(callbackCalled, "Accept callback was called");
+});
+
+add_task(async function testDialogCancel() {
+  const cancelSyncPrefs = {
+    "services.sync.engine.addons": true,
+    "services.sync.engine.bookmarks": false,
+    "services.sync.engine.history": true,
+    "services.sync.engine.tabs": true,
+    "services.sync.engine.prefs": false,
+    "services.sync.engine.passwords": true,
+    "services.sync.engine.addresses": true,
+    "services.sync.engine.creditcards": false,
+  };
+
+  await SpecialPowers.pushPrefEnv({
+    set: [["identity.fxaccounts.enabled", true]],
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+
+  // This will check if the callback was actually called during the test
+  let callbackCalled = false;
+
+  // Enabling all the sync UI is painful in tests, so we just open the dialog manually
+  let syncWindow = await openAndLoadSubDialog(
+    "chrome://browser/content/preferences/dialogs/syncChooseWhatToSync.xhtml",
+    null,
+    {},
+    () => {
+      // We want to test against our previously accepted values in the last test
+      for (const [prefKey, prefValue] of Object.entries(syncPrefs)) {
+        Assert.equal(
+          Services.prefs.getBoolPref(prefKey),
+          prefValue,
+          `${prefValue} is expected value`
+        );
+      }
+      callbackCalled = true;
+    }
+  );
+
+  ok(syncWindow, "Choose what to sync window opened");
+  let syncChooseDialog =
+    syncWindow.document.getElementById("syncChooseOptions");
+  let syncCheckboxes = syncChooseDialog.querySelectorAll(
+    "checkbox[preference]"
+  );
+
+  // This time we're adjusting to the cancel list
+  [...syncCheckboxes].forEach(checkbox => {
+    if (
+      cancelSyncPrefs[checkbox.getAttribute("preference")] !== checkbox.checked
+    ) {
+      checkbox.click();
+    }
+  });
+
+  syncChooseDialog.cancelDialog();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  Assert.ok(callbackCalled, "Cancel callback was called");
+});
+
+/**
+ * Tests that this subdialog can be opened via
+ * about:preferences?action=choose-what-to-sync#sync
+ */
+add_task(async function testDialogLaunchFromURI() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["identity.fxaccounts.enabled", true]],
+  });
+
+  let dialogEventPromise = BrowserTestUtils.waitForEvent(
+    window,
+    "dialogopen",
+    true
+  );
+  await BrowserTestUtils.withNewTab(
+    "about:preferences?action=choose-what-to-sync#sync",
+    async browser => {
+      let dialogEvent = await dialogEventPromise;
+      Assert.equal(
+        dialogEvent.detail.dialog._frame.contentWindow.location,
+        "chrome://browser/content/preferences/dialogs/syncChooseWhatToSync.xhtml"
+      );
+    }
+  );
+});
diff --git a/browser/components/preferences/tests/browser_sync_disabled.js b/browser/components/preferences/tests/browser_sync_disabled.js
new file mode 100644
index 0000000000..1f8518a1e4
--- /dev/null
+++ b/browser/components/preferences/tests/browser_sync_disabled.js
@@ -0,0 +1,26 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Test that we don't show sync pane when it's disabled.
+ * See https://bugzilla.mozilla.org/show_bug.cgi?id=1536752.
+ */
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["identity.fxaccounts.enabled", false]],
+  });
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  ok(
+    gBrowser.contentDocument.getElementById("category-sync").hidden,
+    "sync category hidden"
+  );
+
+  // Check that we don't get any results in sync when searching:
+  await evaluateSearchResults("sync", "no-results-message");
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/browser_sync_pairing.js b/browser/components/preferences/tests/browser_sync_pairing.js
new file mode 100644
index 0000000000..6491007a38
--- /dev/null
+++ b/browser/components/preferences/tests/browser_sync_pairing.js
@@ -0,0 +1,149 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { UIState } = ChromeUtils.importESModule(
+  "resource://services-sync/UIState.sys.mjs"
+);
+const { FxAccountsPairingFlow } = ChromeUtils.importESModule(
+  "resource://gre/modules/FxAccountsPairing.sys.mjs"
+);
+
+// Use sinon for mocking.
+const { sinon } = ChromeUtils.importESModule(
+  "resource://testing-common/Sinon.sys.mjs"
+);
+
+let flowCounter = 0;
+
+add_setup(async function () {
+  Services.prefs.setBoolPref("identity.fxaccounts.pairing.enabled", true);
+  // Sync start-up might interfere with our tests, don't let UIState send UI updates.
+  const origNotifyStateUpdated = UIState._internal.notifyStateUpdated;
+  UIState._internal.notifyStateUpdated = () => {};
+
+  const origGet = UIState.get;
+  UIState.get = () => {
+    return { status: UIState.STATUS_SIGNED_IN, email: "foo@bar.com" };
+  };
+
+  const origStart = FxAccountsPairingFlow.start;
+  FxAccountsPairingFlow.start = ({ emitter: e }) => {
+    return `https://foo.bar/${flowCounter++}`;
+  };
+
+  registerCleanupFunction(() => {
+    UIState._internal.notifyStateUpdated = origNotifyStateUpdated;
+    UIState.get = origGet;
+    FxAccountsPairingFlow.start = origStart;
+  });
+});
+
+add_task(async function testShowsQRCode() {
+  await runWithPairingDialog(async win => {
+    let doc = win.document;
+    let qrContainer = doc.getElementById("qrContainer");
+    let qrWrapper = doc.getElementById("qrWrapper");
+
+    await TestUtils.waitForCondition(
+      () => qrWrapper.getAttribute("pairing-status") == "ready"
+    );
+
+    // Verify that a QRcode is being shown.
+    Assert.ok(
+      qrContainer.style.backgroundImage.startsWith(
+        `url("data:image/gif;base64,R0lGODdhOgA6AIAAAAAAAP///ywAAAAAOgA6AAAC/4yPqcvtD6OctNqLs968+w+G4gKU5nkiJYO2JuW6KsDGKEw3a7AbPZ+r4Ry7nzFIQkKKN6Avlzowo78`
+      )
+    );
+
+    // Close the dialog.
+    let promiseUnloaded = BrowserTestUtils.waitForEvent(win, "unload");
+    gBrowser.contentDocument.querySelector(".dialogClose").click();
+
+    info("waiting for dialog to unload");
+    await promiseUnloaded;
+  });
+});
+
+add_task(async function testCantShowQrCode() {
+  const origStart = FxAccountsPairingFlow.start;
+  FxAccountsPairingFlow.start = async () => {
+    throw new Error("boom");
+  };
+  await runWithPairingDialog(async win => {
+    let doc = win.document;
+    let qrWrapper = doc.getElementById("qrWrapper");
+
+    await TestUtils.waitForCondition(
+      () => qrWrapper.getAttribute("pairing-status") == "error"
+    );
+
+    // Close the dialog.
+    let promiseUnloaded = BrowserTestUtils.waitForEvent(win, "unload");
+    gBrowser.contentDocument.querySelector(".dialogClose").click();
+
+    info("waiting for dialog to unload");
+    await promiseUnloaded;
+  });
+  FxAccountsPairingFlow.start = origStart;
+});
+
+add_task(async function testSwitchToWebContent() {
+  await runWithPairingDialog(async win => {
+    let doc = win.document;
+    let qrWrapper = doc.getElementById("qrWrapper");
+
+    await TestUtils.waitForCondition(
+      () => qrWrapper.getAttribute("pairing-status") == "ready"
+    );
+
+    const spySwitchURL = sinon.spy(win.gFxaPairDeviceDialog, "_switchToUrl");
+    const emitter = win.gFxaPairDeviceDialog._emitter;
+    emitter.emit("view:SwitchToWebContent", "about:robots");
+
+    Assert.equal(spySwitchURL.callCount, 1);
+  });
+});
+
+add_task(async function testError() {
+  await runWithPairingDialog(async win => {
+    let doc = win.document;
+    let qrWrapper = doc.getElementById("qrWrapper");
+
+    await TestUtils.waitForCondition(
+      () => qrWrapper.getAttribute("pairing-status") == "ready"
+    );
+
+    const emitter = win.gFxaPairDeviceDialog._emitter;
+    emitter.emit("view:Error");
+
+    await TestUtils.waitForCondition(
+      () => qrWrapper.getAttribute("pairing-status") == "error"
+    );
+
+    // Close the dialog.
+    let promiseUnloaded = BrowserTestUtils.waitForEvent(win, "unload");
+    gBrowser.contentDocument.querySelector(".dialogClose").click();
+
+    info("waiting for dialog to unload");
+    await promiseUnloaded;
+  });
+});
+
+async function runWithPairingDialog(test) {
+  await openPreferencesViaOpenPreferencesAPI("paneSync", { leaveOpen: true });
+
+  let promiseSubDialogLoaded = promiseLoadSubDialog(
+    "chrome://browser/content/preferences/fxaPairDevice.xhtml"
+  );
+  gBrowser.contentWindow.gSyncPane.pairAnotherDevice();
+
+  let win = await promiseSubDialogLoaded;
+
+  await test(win);
+
+  sinon.restore();
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+}
diff --git a/browser/components/preferences/tests/browser_trendingsuggestions.js b/browser/components/preferences/tests/browser_trendingsuggestions.js
new file mode 100644
index 0000000000..1cfae387cf
--- /dev/null
+++ b/browser/components/preferences/tests/browser_trendingsuggestions.js
@@ -0,0 +1,80 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const { SearchTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/SearchTestUtils.sys.mjs"
+);
+
+const MAIN_PREF = "browser.search.suggest.enabled";
+const URLBAR_PREF = "browser.urlbar.suggest.searches";
+const TRENDING_PREF = "browser.urlbar.trending.featureGate";
+
+const TRENDING_CHECKBOX_ID = "showTrendingSuggestions";
+const SUGGESTIONED_CHECKBOX_ID = "suggestionsInSearchFieldsCheckbox";
+
+SearchTestUtils.init(this);
+
+add_setup(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [MAIN_PREF, true],
+      [URLBAR_PREF, true],
+      [TRENDING_PREF, true],
+    ],
+  });
+
+  await SearchTestUtils.installSearchExtension({
+    name: "engine1",
+    search_url: "https://example.com/engine1",
+    search_url_get_params: "search={searchTerms}",
+  });
+  const defaultEngine = await Services.search.getDefault();
+
+  registerCleanupFunction(async () => {
+    await Services.search.setDefault(
+      defaultEngine,
+      Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+    );
+  });
+});
+
+add_task(async function testSuggestionsDisabled() {
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let trendingCheckbox = doc.getElementById(TRENDING_CHECKBOX_ID);
+  let suggestionsCheckbox = doc.getElementById(SUGGESTIONED_CHECKBOX_ID);
+
+  Assert.ok(trendingCheckbox.checked, "Checkbox should be visible and checked");
+  Assert.ok(!trendingCheckbox.disabled, "Checkbox should not be disabled");
+
+  // Disable search suggestions.
+  suggestionsCheckbox.checked = false;
+  suggestionsCheckbox.doCommand();
+
+  await BrowserTestUtils.waitForCondition(
+    () => trendingCheckbox.disabled,
+    "Trending checkbox should be disabled when search suggestions are disabled"
+  );
+
+  // Clean up.
+  Services.prefs.clearUserPref(MAIN_PREF);
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function testNonTrendingEngine() {
+  // Set engine that does not support trending suggestions as default.
+  const engine1 = Services.search.getEngineByName("engine1");
+  Services.search.setDefault(
+    engine1,
+    Ci.nsISearchService.CHANGE_REASON_UNKNOWN
+  );
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let trendingCheckbox = doc.getElementById(TRENDING_CHECKBOX_ID);
+
+  Assert.ok(
+    trendingCheckbox.disabled,
+    "Checkbox should be disabled when an engine that doesnt support trending suggestions is default"
+  );
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/components/preferences/tests/browser_warning_permanent_private_browsing.js b/browser/components/preferences/tests/browser_warning_permanent_private_browsing.js
new file mode 100644
index 0000000000..8d1fa3c80b
--- /dev/null
+++ b/browser/components/preferences/tests/browser_warning_permanent_private_browsing.js
@@ -0,0 +1,57 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+function checkForPrompt(prefVal) {
+  return async function () {
+    await SpecialPowers.pushPrefEnv({
+      set: [
+        ["privacy.history.custom", true],
+        ["browser.privatebrowsing.autostart", !prefVal],
+      ],
+    });
+
+    await openPreferencesViaOpenPreferencesAPI("panePrivacy", {
+      leaveOpen: true,
+    });
+    let doc = gBrowser.contentDocument;
+    is(
+      doc.getElementById("historyMode").value,
+      "custom",
+      "Expect custom history mode"
+    );
+
+    // Stub out the prompt method as an easy way to check it was shown. We throw away
+    // the tab straight after so don't need to bother restoring it.
+    let promptFired = false;
+    doc.defaultView.confirmRestartPrompt = () => {
+      promptFired = true;
+      return doc.defaultView.CONFIRM_RESTART_PROMPT_RESTART_NOW;
+    };
+    // Tick the checkbox and pretend the user did it:
+    let checkbox = doc.getElementById("privateBrowsingAutoStart");
+    checkbox.checked = prefVal;
+    checkbox.doCommand();
+
+    // Now the prompt should have shown.
+    ok(
+      promptFired,
+      `Expect a prompt when turning permanent private browsing ${
+        prefVal ? "on" : "off"
+      }!`
+    );
+    BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  };
+}
+
+/**
+ * Check we show the prompt if the permanent private browsing pref is false
+ * and we flip the checkbox to true.
+ */
+add_task(checkForPrompt(true));
+
+/**
+ * Check it works in the other direction:
+ */
+add_task(checkForPrompt(false));
diff --git a/browser/components/preferences/tests/browser_windows_launch_on_login.js b/browser/components/preferences/tests/browser_windows_launch_on_login.js
new file mode 100644
index 0000000000..72a9e65ba9
--- /dev/null
+++ b/browser/components/preferences/tests/browser_windows_launch_on_login.js
@@ -0,0 +1,145 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+ChromeUtils.defineESModuleGetters(this, {
+  BackgroundUpdate: "resource://gre/modules/BackgroundUpdate.sys.mjs",
+  MigrationUtils: "resource:///modules/MigrationUtils.sys.mjs",
+  PermissionTestUtils: "resource://testing-common/PermissionTestUtils.sys.mjs",
+  WindowsLaunchOnLogin: "resource://gre/modules/WindowsLaunchOnLogin.sys.mjs",
+});
+
+const { ExperimentAPI } = ChromeUtils.importESModule(
+  "resource://nimbus/ExperimentAPI.sys.mjs"
+);
+
+const { ExperimentFakes } = ChromeUtils.importESModule(
+  "resource://testing-common/NimbusTestUtils.sys.mjs"
+);
+
+add_task(async function test_check_checkbox() {
+  await ExperimentAPI.ready();
+  let doCleanup = await ExperimentFakes.enrollWithFeatureConfig({
+    featureId: "windowsLaunchOnLogin",
+    value: { enabled: true },
+  });
+  await WindowsLaunchOnLogin.withLaunchOnLoginRegistryKey(async wrk => {
+    // Open preferences to general pane
+    await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+      leaveOpen: true,
+    });
+    let doc = gBrowser.contentDocument;
+
+    let launchOnLoginCheckbox = doc.getElementById("windowsLaunchOnLogin");
+    launchOnLoginCheckbox.click();
+    ok(launchOnLoginCheckbox.checked, "Autostart checkbox checked");
+
+    ok(
+      wrk.hasValue(WindowsLaunchOnLogin.getLaunchOnLoginRegistryName()),
+      "Key exists"
+    );
+
+    gBrowser.removeCurrentTab();
+  });
+  await doCleanup();
+});
+
+add_task(async function test_uncheck_checkbox() {
+  await ExperimentAPI.ready();
+  let doCleanup = await ExperimentFakes.enrollWithFeatureConfig({
+    featureId: "windowsLaunchOnLogin",
+    value: { enabled: true },
+  });
+  await WindowsLaunchOnLogin.withLaunchOnLoginRegistryKey(async wrk => {
+    // Open preferences to general pane
+    await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+      leaveOpen: true,
+    });
+    let doc = gBrowser.contentDocument;
+
+    let launchOnLoginCheckbox = doc.getElementById("windowsLaunchOnLogin");
+    launchOnLoginCheckbox.click();
+    ok(!launchOnLoginCheckbox.checked, "Autostart checkbox unchecked");
+
+    ok(
+      !wrk.hasValue(WindowsLaunchOnLogin.getLaunchOnLoginRegistryName()),
+      "Autostart registry key does not exist"
+    );
+
+    gBrowser.removeCurrentTab();
+  });
+  await doCleanup();
+});
+
+add_task(async function create_external_regkey() {
+  await ExperimentAPI.ready();
+  let doCleanup = await ExperimentFakes.enrollWithFeatureConfig({
+    featureId: "windowsLaunchOnLogin",
+    value: { enabled: true },
+  });
+  await WindowsLaunchOnLogin.withLaunchOnLoginRegistryKey(async wrk => {
+    // Create registry key without using settings pane to check if
+    // this is reflected in the settings
+    let autostartPath =
+      WindowsLaunchOnLogin.quoteString(
+        Services.dirsvc.get("XREExeF", Ci.nsIFile).path
+      ) + " -os-autostart";
+    wrk.writeStringValue(
+      WindowsLaunchOnLogin.getLaunchOnLoginRegistryName(),
+      autostartPath
+    );
+
+    // Open preferences to general pane
+    await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+      leaveOpen: true,
+    });
+    let doc = gBrowser.contentDocument;
+
+    let launchOnLoginCheckbox = doc.getElementById("windowsLaunchOnLogin");
+    ok(
+      launchOnLoginCheckbox.checked,
+      "Autostart checkbox automatically checked"
+    );
+
+    gBrowser.removeCurrentTab();
+  });
+  await doCleanup();
+});
+
+add_task(async function delete_external_regkey() {
+  await ExperimentAPI.ready();
+  let doCleanup = await ExperimentFakes.enrollWithFeatureConfig({
+    featureId: "windowsLaunchOnLogin",
+    value: { enabled: true },
+  });
+  await WindowsLaunchOnLogin.withLaunchOnLoginRegistryKey(async wrk => {
+    // Delete registry key without using settings pane to check if
+    // this is reflected in the settings
+    wrk.removeValue(WindowsLaunchOnLogin.getLaunchOnLoginRegistryName());
+
+    // Open preferences to general pane
+    await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+      leaveOpen: true,
+    });
+    let doc = gBrowser.contentDocument;
+
+    let launchOnLoginCheckbox = doc.getElementById("windowsLaunchOnLogin");
+    ok(
+      !launchOnLoginCheckbox.checked,
+      "Launch on login checkbox automatically unchecked"
+    );
+
+    gBrowser.removeCurrentTab();
+  });
+  await doCleanup();
+});
+
+registerCleanupFunction(async function () {
+  await WindowsLaunchOnLogin.withLaunchOnLoginRegistryKey(async wrk => {
+    let registryName = WindowsLaunchOnLogin.getLaunchOnLoginRegistryName();
+    if (wrk.hasValue(registryName)) {
+      wrk.removeValue(registryName);
+    }
+  });
+});
diff --git a/browser/components/preferences/tests/empty_pdf_file.pdf b/browser/components/preferences/tests/empty_pdf_file.pdf
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/browser/components/preferences/tests/empty_pdf_file.pdf
diff --git a/browser/components/preferences/tests/engine1/manifest.json b/browser/components/preferences/tests/engine1/manifest.json
new file mode 100644
index 0000000000..5fa44ea692
--- /dev/null
+++ b/browser/components/preferences/tests/engine1/manifest.json
@@ -0,0 +1,27 @@
+{
+  "name": "engine1",
+  "manifest_version": 2,
+  "version": "1.0",
+  "browser_specific_settings": {
+    "gecko": {
+      "id": "engine1@search.mozilla.org"
+    }
+  },
+  "hidden": true,
+  "description": "A small test engine",
+  "icons": {
+    "16": "favicon.ico"
+  },
+  "chrome_settings_overrides": {
+    "search_provider": {
+      "name": "engine1",
+      "search_url": "https://1.example.com/search",
+      "params": [
+        {
+          "name": "q",
+          "value": "{searchTerms}"
+        }
+      ]
+    }
+  }
+}
diff --git a/browser/components/preferences/tests/engine2/manifest.json b/browser/components/preferences/tests/engine2/manifest.json
new file mode 100644
index 0000000000..7ab094198b
--- /dev/null
+++ b/browser/components/preferences/tests/engine2/manifest.json
@@ -0,0 +1,27 @@
+{
+  "name": "engine2",
+  "manifest_version": 2,
+  "version": "1.0",
+  "browser_specific_settings": {
+    "gecko": {
+      "id": "engine2@search.mozilla.org"
+    }
+  },
+  "hidden": true,
+  "description": "A small test engine",
+  "icons": {
+    "16": "favicon.ico"
+  },
+  "chrome_settings_overrides": {
+    "search_provider": {
+      "name": "engine2",
+      "search_url": "https://2.example.com/search",
+      "params": [
+        {
+          "name": "q",
+          "value": "{searchTerms}"
+        }
+      ]
+    }
+  }
+}
diff --git a/browser/components/preferences/tests/head.js b/browser/components/preferences/tests/head.js
new file mode 100644
index 0000000000..1861c040e5
--- /dev/null
+++ b/browser/components/preferences/tests/head.js
@@ -0,0 +1,334 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const { PermissionTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/PermissionTestUtils.sys.mjs"
+);
+
+const kDefaultWait = 2000;
+
+function is_element_visible(aElement, aMsg) {
+  isnot(aElement, null, "Element should not be null, when checking visibility");
+  ok(!BrowserTestUtils.isHidden(aElement), aMsg);
+}
+
+function is_element_hidden(aElement, aMsg) {
+  isnot(aElement, null, "Element should not be null, when checking visibility");
+  ok(BrowserTestUtils.isHidden(aElement), aMsg);
+}
+
+function open_preferences(aCallback) {
+  gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser, "about:preferences");
+  let newTabBrowser = gBrowser.getBrowserForTab(gBrowser.selectedTab);
+  newTabBrowser.addEventListener(
+    "Initialized",
+    function () {
+      aCallback(gBrowser.contentWindow);
+    },
+    { capture: true, once: true }
+  );
+}
+
+function openAndLoadSubDialog(
+  aURL,
+  aFeatures = null,
+  aParams = null,
+  aClosingCallback = null
+) {
+  let promise = promiseLoadSubDialog(aURL);
+  content.gSubDialog.open(
+    aURL,
+    { features: aFeatures, closingCallback: aClosingCallback },
+    aParams
+  );
+  return promise;
+}
+
+function promiseLoadSubDialog(aURL) {
+  return new Promise((resolve, reject) => {
+    content.gSubDialog._dialogStack.addEventListener(
+      "dialogopen",
+      function dialogopen(aEvent) {
+        if (
+          aEvent.detail.dialog._frame.contentWindow.location == "about:blank"
+        ) {
+          return;
+        }
+        content.gSubDialog._dialogStack.removeEventListener(
+          "dialogopen",
+          dialogopen
+        );
+
+        is(
+          aEvent.detail.dialog._frame.contentWindow.location.toString(),
+          aURL,
+          "Check the proper URL is loaded"
+        );
+
+        // Check visibility
+        is_element_visible(aEvent.detail.dialog._overlay, "Overlay is visible");
+
+        // Check that stylesheets were injected
+        let expectedStyleSheetURLs =
+          aEvent.detail.dialog._injectedStyleSheets.slice(0);
+        for (let styleSheet of aEvent.detail.dialog._frame.contentDocument
+          .styleSheets) {
+          let i = expectedStyleSheetURLs.indexOf(styleSheet.href);
+          if (i >= 0) {
+            info("found " + styleSheet.href);
+            expectedStyleSheetURLs.splice(i, 1);
+          }
+        }
+        is(
+          expectedStyleSheetURLs.length,
+          0,
+          "All expectedStyleSheetURLs should have been found"
+        );
+
+        // Wait for the next event tick to make sure the remaining part of the
+        // testcase runs after the dialog gets ready for input.
+        executeSoon(() => resolve(aEvent.detail.dialog._frame.contentWindow));
+      }
+    );
+  });
+}
+
+async function openPreferencesViaOpenPreferencesAPI(aPane, aOptions) {
+  let finalPaneEvent = Services.prefs.getBoolPref("identity.fxaccounts.enabled")
+    ? "sync-pane-loaded"
+    : "privacy-pane-loaded";
+  let finalPrefPaneLoaded = TestUtils.topicObserved(finalPaneEvent, () => true);
+  gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser, "about:blank");
+  openPreferences(aPane, aOptions);
+  let newTabBrowser = gBrowser.selectedBrowser;
+
+  if (!newTabBrowser.contentWindow) {
+    await BrowserTestUtils.waitForEvent(newTabBrowser, "Initialized", true);
+    await BrowserTestUtils.waitForEvent(newTabBrowser.contentWindow, "load");
+    await finalPrefPaneLoaded;
+  }
+
+  let win = gBrowser.contentWindow;
+  let selectedPane = win.history.state;
+  if (!aOptions || !aOptions.leaveOpen) {
+    gBrowser.removeCurrentTab();
+  }
+  return { selectedPane };
+}
+
+async function runSearchInput(input) {
+  let searchInput = gBrowser.contentDocument.getElementById("searchInput");
+  searchInput.focus();
+  let searchCompletedPromise = BrowserTestUtils.waitForEvent(
+    gBrowser.contentWindow,
+    "PreferencesSearchCompleted",
+    evt => evt.detail == input
+  );
+  EventUtils.sendString(input);
+  await searchCompletedPromise;
+}
+
+async function evaluateSearchResults(
+  keyword,
+  searchResults,
+  includeExperiments = false
+) {
+  searchResults = Array.isArray(searchResults)
+    ? searchResults
+    : [searchResults];
+  searchResults.push("header-searchResults");
+
+  await runSearchInput(keyword);
+
+  let mainPrefTag = gBrowser.contentDocument.getElementById("mainPrefPane");
+  for (let i = 0; i < mainPrefTag.childElementCount; i++) {
+    let child = mainPrefTag.children[i];
+    if (!includeExperiments && child.id?.startsWith("pane-experimental")) {
+      continue;
+    }
+    if (searchResults.includes(child.id)) {
+      is_element_visible(child, `${child.id} should be in search results`);
+    } else if (child.id) {
+      is_element_hidden(child, `${child.id} should not be in search results`);
+    }
+  }
+}
+
+function waitForMutation(target, opts, cb) {
+  return new Promise(resolve => {
+    let observer = new MutationObserver(() => {
+      if (!cb || cb(target)) {
+        observer.disconnect();
+        resolve();
+      }
+    });
+    observer.observe(target, opts);
+  });
+}
+
+// Used to add sample experimental features for testing. To use, create
+// a DefinitionServer, then call addDefinition as needed.
+class DefinitionServer {
+  constructor(definitionOverrides = []) {
+    let { HttpServer } = ChromeUtils.importESModule(
+      "resource://testing-common/httpd.sys.mjs"
+    );
+
+    this.server = new HttpServer();
+    this.server.registerPathHandler("/definitions.json", this);
+    this.definitions = {};
+
+    for (const override of definitionOverrides) {
+      this.addDefinition(override);
+    }
+
+    this.server.start();
+    registerCleanupFunction(
+      () => new Promise(resolve => this.server.stop(resolve))
+    );
+  }
+
+  // for nsIHttpRequestHandler
+  handle(request, response) {
+    response.write(JSON.stringify(this.definitions));
+  }
+
+  get definitionsUrl() {
+    const { primaryScheme, primaryHost, primaryPort } = this.server.identity;
+    return `${primaryScheme}://${primaryHost}:${primaryPort}/definitions.json`;
+  }
+
+  addDefinition(overrides = {}) {
+    const definition = {
+      id: "test-feature",
+      // These l10n IDs are just random so we have some text to display
+      title: "experimental-features-media-jxl",
+      description: "pane-experimental-description2",
+      restartRequired: false,
+      type: "boolean",
+      preference: "test.feature",
+      defaultValue: false,
+      isPublic: false,
+      ...overrides,
+    };
+    // convert targeted values, used by fromId
+    definition.isPublic = { default: definition.isPublic };
+    definition.defaultValue = { default: definition.defaultValue };
+    this.definitions[definition.id] = definition;
+    return definition;
+  }
+}
+
+/**
+ * Creates observer that waits for and then compares all perm-changes with the observances in order.
+ * @param {Array} observances permission changes to observe (order is important)
+ * @returns {Promise} Promise object that resolves once all permission changes have been observed
+ */
+function createObserveAllPromise(observances) {
+  // Create new promise that resolves once all items
+  // in observances array have been observed.
+  return new Promise(resolve => {
+    let permObserver = {
+      observe(aSubject, aTopic, aData) {
+        if (aTopic != "perm-changed") {
+          return;
+        }
+
+        if (!observances.length) {
+          // See bug 1063410
+          return;
+        }
+
+        let permission = aSubject.QueryInterface(Ci.nsIPermission);
+        let expected = observances.shift();
+
+        info(
+          `observed perm-changed for ${permission.principal.origin} (remaining ${observances.length})`
+        );
+
+        is(aData, expected.data, "type of message should be the same");
+        for (let prop of ["type", "capability", "expireType"]) {
+          if (expected[prop]) {
+            is(
+              permission[prop],
+              expected[prop],
+              `property: "${prop}" should be equal (${permission.principal.origin})`
+            );
+          }
+        }
+
+        if (expected.origin) {
+          is(
+            permission.principal.origin,
+            expected.origin,
+            `property: "origin" should be equal (${permission.principal.origin})`
+          );
+        }
+
+        if (!observances.length) {
+          Services.obs.removeObserver(permObserver, "perm-changed");
+          executeSoon(resolve);
+        }
+      },
+    };
+    Services.obs.addObserver(permObserver, "perm-changed");
+  });
+}
+
+/**
+ * Waits for preference to be set and asserts the value.
+ * @param {string} pref - Preference key.
+ * @param {*} expectedValue - Expected value of the preference.
+ * @param {string} message - Assertion message.
+ */
+async function waitForAndAssertPrefState(pref, expectedValue, message) {
+  await TestUtils.waitForPrefChange(pref, value => {
+    if (value != expectedValue) {
+      return false;
+    }
+    is(value, expectedValue, message);
+    return true;
+  });
+}
+
+/**
+ * The Relay promo is not shown for distributions with a custom FxA instance,
+ * since Relay requires an account on our own server. These prefs are set to a
+ * dummy address by the test harness, filling the prefs with a "user value."
+ * This temporarily sets the default value equal to the dummy value, so that
+ * Firefox thinks we've configured the correct FxA server.
+ * @returns {Promise<MockFxAUtilityFunctions>} { mock, unmock }
+ */
+async function mockDefaultFxAInstance() {
+  /**
+   * @typedef {Object} MockFxAUtilityFunctions
+   * @property {function():void} mock - Makes the dummy values default, creating
+   *                             the illusion of a production FxA instance.
+   * @property {function():void} unmock - Restores the true defaults, creating
+   *                             the illusion of a custom FxA instance.
+   */
+
+  const defaultPrefs = Services.prefs.getDefaultBranch("");
+  const userPrefs = Services.prefs.getBranch("");
+  const realAuth = defaultPrefs.getCharPref("identity.fxaccounts.auth.uri");
+  const realRoot = defaultPrefs.getCharPref("identity.fxaccounts.remote.root");
+  const mockAuth = userPrefs.getCharPref("identity.fxaccounts.auth.uri");
+  const mockRoot = userPrefs.getCharPref("identity.fxaccounts.remote.root");
+  const mock = () => {
+    defaultPrefs.setCharPref("identity.fxaccounts.auth.uri", mockAuth);
+    defaultPrefs.setCharPref("identity.fxaccounts.remote.root", mockRoot);
+    userPrefs.clearUserPref("identity.fxaccounts.auth.uri");
+    userPrefs.clearUserPref("identity.fxaccounts.remote.root");
+  };
+  const unmock = () => {
+    defaultPrefs.setCharPref("identity.fxaccounts.auth.uri", realAuth);
+    defaultPrefs.setCharPref("identity.fxaccounts.remote.root", realRoot);
+    userPrefs.setCharPref("identity.fxaccounts.auth.uri", mockAuth);
+    userPrefs.setCharPref("identity.fxaccounts.remote.root", mockRoot);
+  };
+
+  mock();
+  registerCleanupFunction(unmock);
+
+  return { mock, unmock };
+}
diff --git a/browser/components/preferences/tests/privacypane_tests_perwindow.js b/browser/components/preferences/tests/privacypane_tests_perwindow.js
new file mode 100644
index 0000000000..8c376d1705
--- /dev/null
+++ b/browser/components/preferences/tests/privacypane_tests_perwindow.js
@@ -0,0 +1,388 @@
+// This file gets imported into the same scope as head.js.
+/* import-globals-from head.js */
+
+async function runTestOnPrivacyPrefPane(testFunc) {
+  info("runTestOnPrivacyPrefPane entered");
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:preferences",
+    true,
+    true
+  );
+  let browser = tab.linkedBrowser;
+  info("loaded about:preferences");
+  await browser.contentWindow.gotoPref("panePrivacy");
+  info("viewing privacy pane, executing testFunc");
+  await testFunc(browser.contentWindow);
+  BrowserTestUtils.removeTab(tab);
+}
+
+function controlChanged(element) {
+  element.doCommand();
+}
+
+// We can only test the panes that don't trigger a preference update
+function test_pane_visibility(win) {
+  let modes = {
+    remember: "historyRememberPane",
+    custom: "historyCustomPane",
+  };
+
+  let historymode = win.document.getElementById("historyMode");
+  ok(historymode, "history mode menulist should exist");
+  let historypane = win.document.getElementById("historyPane");
+  ok(historypane, "history mode pane should exist");
+
+  for (let mode in modes) {
+    historymode.value = mode;
+    controlChanged(historymode);
+    is(
+      historypane.selectedPanel,
+      win.document.getElementById(modes[mode]),
+      "The correct pane should be selected for the " + mode + " mode"
+    );
+    is_element_visible(
+      historypane.selectedPanel,
+      "Correct pane should be visible for the " + mode + " mode"
+    );
+  }
+}
+
+function test_dependent_elements(win) {
+  let historymode = win.document.getElementById("historyMode");
+  ok(historymode, "history mode menulist should exist");
+  let pbautostart = win.document.getElementById("privateBrowsingAutoStart");
+  ok(pbautostart, "the private browsing auto-start checkbox should exist");
+  let controls = [
+    win.document.getElementById("rememberHistory"),
+    win.document.getElementById("rememberForms"),
+    win.document.getElementById("deleteOnClose"),
+    win.document.getElementById("alwaysClear"),
+  ];
+  controls.forEach(function (control) {
+    ok(control, "the dependent controls should exist");
+  });
+  let independents = [
+    win.document.getElementById("contentBlockingBlockCookiesCheckbox"),
+  ];
+  independents.forEach(function (control) {
+    ok(control, "the independent controls should exist");
+  });
+  let cookieexceptions = win.document.getElementById("cookieExceptions");
+  ok(cookieexceptions, "the cookie exceptions button should exist");
+  let deleteOnCloseCheckbox = win.document.getElementById("deleteOnClose");
+  ok(deleteOnCloseCheckbox, "the delete on close checkbox should exist");
+  let alwaysclear = win.document.getElementById("alwaysClear");
+  ok(alwaysclear, "the clear data on close checkbox should exist");
+  let rememberhistory = win.document.getElementById("rememberHistory");
+  ok(rememberhistory, "the remember history checkbox should exist");
+  let rememberforms = win.document.getElementById("rememberForms");
+  ok(rememberforms, "the remember forms checkbox should exist");
+  let alwaysclearsettings = win.document.getElementById("clearDataSettings");
+  ok(alwaysclearsettings, "the clear data settings button should exist");
+
+  function expect_disabled(disabled) {
+    controls.forEach(function (control) {
+      is(
+        control.disabled,
+        disabled,
+        control.getAttribute("id") +
+          " should " +
+          (disabled ? "" : "not ") +
+          "be disabled"
+      );
+    });
+    if (disabled) {
+      ok(
+        !alwaysclear.checked,
+        "the clear data on close checkbox value should be as expected"
+      );
+      ok(
+        !rememberhistory.checked,
+        "the remember history checkbox value should be as expected"
+      );
+      ok(
+        !rememberforms.checked,
+        "the remember forms checkbox value should be as expected"
+      );
+    }
+  }
+  function check_independents(expected) {
+    independents.forEach(function (control) {
+      is(
+        control.disabled,
+        expected,
+        control.getAttribute("id") +
+          " should " +
+          (expected ? "" : "not ") +
+          "be disabled"
+      );
+    });
+
+    ok(
+      !cookieexceptions.disabled,
+      "the cookie exceptions button should never be disabled"
+    );
+    ok(
+      alwaysclearsettings.disabled,
+      "the clear data settings button should always be disabled"
+    );
+  }
+
+  // controls should only change in custom mode
+  historymode.value = "remember";
+  controlChanged(historymode);
+  expect_disabled(false);
+  check_independents(false);
+
+  // setting the mode to custom shouldn't change anything
+  historymode.value = "custom";
+  controlChanged(historymode);
+  expect_disabled(false);
+  check_independents(false);
+}
+
+function test_dependent_cookie_elements(win) {
+  let deleteOnCloseCheckbox = win.document.getElementById("deleteOnClose");
+  let deleteOnCloseNote = win.document.getElementById("deleteOnCloseNote");
+  let blockCookiesMenu = win.document.getElementById("blockCookiesMenu");
+
+  let controls = [blockCookiesMenu, deleteOnCloseCheckbox];
+  controls.forEach(function (control) {
+    ok(control, "the dependent cookie controls should exist");
+  });
+  let blockCookiesCheckbox = win.document.getElementById(
+    "contentBlockingBlockCookiesCheckbox"
+  );
+  ok(blockCookiesCheckbox, "the block cookies checkbox should exist");
+
+  function expect_disabled(disabled, c = controls) {
+    c.forEach(function (control) {
+      is(
+        control.disabled,
+        disabled,
+        control.getAttribute("id") +
+          " should " +
+          (disabled ? "" : "not ") +
+          "be disabled"
+      );
+    });
+  }
+
+  blockCookiesCheckbox.checked = true;
+  controlChanged(blockCookiesCheckbox);
+  expect_disabled(false);
+
+  blockCookiesCheckbox.checked = false;
+  controlChanged(blockCookiesCheckbox);
+  expect_disabled(true, [blockCookiesMenu]);
+  expect_disabled(false, [deleteOnCloseCheckbox]);
+  is_element_hidden(
+    deleteOnCloseNote,
+    "The notice for delete on close in permanent private browsing mode should be hidden."
+  );
+
+  blockCookiesMenu.value = "always";
+  controlChanged(blockCookiesMenu);
+  expect_disabled(true, [deleteOnCloseCheckbox]);
+  expect_disabled(false, [blockCookiesMenu]);
+  is_element_hidden(
+    deleteOnCloseNote,
+    "The notice for delete on close in permanent private browsing mode should be hidden."
+  );
+
+  if (win.contentBlockingCookiesAndSiteDataRejectTrackersEnabled) {
+    blockCookiesMenu.value = "trackers";
+  } else {
+    blockCookiesMenu.value = "unvisited";
+  }
+  controlChanged(blockCookiesMenu);
+  expect_disabled(false);
+
+  let historymode = win.document.getElementById("historyMode");
+
+  // The History mode setting for "never remember history" should still
+  // disable the "keep cookies until..." menu.
+  historymode.value = "dontremember";
+  controlChanged(historymode);
+  expect_disabled(true, [deleteOnCloseCheckbox]);
+  is_element_visible(
+    deleteOnCloseNote,
+    "The notice for delete on close in permanent private browsing mode should be visible."
+  );
+  expect_disabled(false, [blockCookiesMenu]);
+
+  historymode.value = "remember";
+  controlChanged(historymode);
+  expect_disabled(false);
+  is_element_hidden(
+    deleteOnCloseNote,
+    "The notice for delete on close in permanent private browsing mode should be hidden."
+  );
+}
+
+function test_dependent_clearonclose_elements(win) {
+  let historymode = win.document.getElementById("historyMode");
+  ok(historymode, "history mode menulist should exist");
+  let pbautostart = win.document.getElementById("privateBrowsingAutoStart");
+  ok(pbautostart, "the private browsing auto-start checkbox should exist");
+  let alwaysclear = win.document.getElementById("alwaysClear");
+  ok(alwaysclear, "the clear data on close checkbox should exist");
+  let alwaysclearsettings = win.document.getElementById("clearDataSettings");
+  ok(alwaysclearsettings, "the clear data settings button should exist");
+
+  function expect_disabled(disabled) {
+    is(
+      alwaysclearsettings.disabled,
+      disabled,
+      "the clear data settings should " +
+        (disabled ? "" : "not ") +
+        "be disabled"
+    );
+  }
+
+  historymode.value = "custom";
+  controlChanged(historymode);
+  pbautostart.checked = false;
+  controlChanged(pbautostart);
+  alwaysclear.checked = false;
+  controlChanged(alwaysclear);
+  expect_disabled(true);
+
+  alwaysclear.checked = true;
+  controlChanged(alwaysclear);
+  expect_disabled(false);
+
+  alwaysclear.checked = false;
+  controlChanged(alwaysclear);
+  expect_disabled(true);
+}
+
+async function test_dependent_prefs(win) {
+  let historymode = win.document.getElementById("historyMode");
+  ok(historymode, "history mode menulist should exist");
+  let controls = [
+    win.document.getElementById("rememberHistory"),
+    win.document.getElementById("rememberForms"),
+  ];
+  controls.forEach(function (control) {
+    ok(control, "the micro-management controls should exist");
+  });
+
+  function expect_checked(checked) {
+    controls.forEach(function (control) {
+      is(
+        control.checked,
+        checked,
+        control.getAttribute("id") +
+          " should " +
+          (checked ? "" : "not ") +
+          "be checked"
+      );
+    });
+  }
+
+  // controls should be checked in remember mode
+  historymode.value = "remember";
+  controlChanged(historymode);
+  // Initial updates from prefs are not sync, so wait:
+  await TestUtils.waitForCondition(
+    () => controls[0].getAttribute("checked") == "true"
+  );
+  expect_checked(true);
+
+  // even if they're unchecked in custom mode
+  historymode.value = "custom";
+  controlChanged(historymode);
+  controls.forEach(function (control) {
+    control.checked = false;
+    controlChanged(control);
+  });
+  expect_checked(false);
+  historymode.value = "remember";
+  controlChanged(historymode);
+  expect_checked(true);
+}
+
+function test_historymode_retention(mode, expect) {
+  return function test_historymode_retention_fn(win) {
+    let historymode = win.document.getElementById("historyMode");
+    ok(historymode, "history mode menulist should exist");
+
+    if (
+      (historymode.value == "remember" && mode == "dontremember") ||
+      (historymode.value == "dontremember" && mode == "remember") ||
+      (historymode.value == "custom" && mode == "dontremember")
+    ) {
+      return;
+    }
+
+    if (expect !== undefined) {
+      is(
+        historymode.value,
+        expect,
+        "history mode is expected to remain " + expect
+      );
+    }
+
+    historymode.value = mode;
+    controlChanged(historymode);
+  };
+}
+
+function test_custom_retention(controlToChange, expect, valueIncrement) {
+  return function test_custom_retention_fn(win) {
+    let historymode = win.document.getElementById("historyMode");
+    ok(historymode, "history mode menulist should exist");
+
+    if (expect !== undefined) {
+      is(
+        historymode.value,
+        expect,
+        "history mode is expected to remain " + expect
+      );
+    }
+
+    historymode.value = "custom";
+    controlChanged(historymode);
+
+    controlToChange = win.document.getElementById(controlToChange);
+    ok(controlToChange, "the control to change should exist");
+    switch (controlToChange.localName) {
+      case "checkbox":
+        controlToChange.checked = !controlToChange.checked;
+        break;
+      case "menulist":
+        controlToChange.value = valueIncrement;
+        break;
+    }
+    controlChanged(controlToChange);
+  };
+}
+
+const gPrefCache = new Map();
+
+function cache_preferences(win) {
+  let prefs = win.Preferences.getAll();
+  for (let pref of prefs) {
+    gPrefCache.set(pref.id, pref.value);
+  }
+}
+
+function reset_preferences(win) {
+  let prefs = win.Preferences.getAll();
+  // Avoid assigning undefined, which means clearing a "user"/test pref value
+  for (let pref of prefs) {
+    if (gPrefCache.has(pref.id)) {
+      pref.value = gPrefCache.get(pref.id);
+    }
+  }
+}
+
+function run_test_subset(subset) {
+  info("subset: " + Array.from(subset, x => x.name).join(",") + "\n");
+  let tests = [cache_preferences, ...subset, reset_preferences];
+  for (let test of tests) {
+    add_task(runTestOnPrivacyPrefPane.bind(undefined, test));
+  }
+}
diff --git a/browser/components/preferences/tests/siteData/browser.toml b/browser/components/preferences/tests/siteData/browser.toml
new file mode 100644
index 0000000000..9f4f8306e1
--- /dev/null
+++ b/browser/components/preferences/tests/siteData/browser.toml
@@ -0,0 +1,24 @@
+[DEFAULT]
+support-files = [
+  "head.js",
+  "site_data_test.html",
+  "service_worker_test.html",
+  "service_worker_test.js",
+  "offline/offline.html",
+  "offline/manifest.appcache",
+]
+
+["browser_clearSiteData.js"]
+
+["browser_siteData.js"]
+
+["browser_siteData2.js"]
+skip-if = [
+  "win11_2009 && (!debug && !asan)", # Bug 1797751
+  "apple_catalina && debug", # Bug 1775910
+]
+
+["browser_siteData3.js"]
+
+["browser_siteData_multi_select.js"]
+skip-if = ["tsan"] # Bug 1683730
diff --git a/browser/components/preferences/tests/siteData/browser_clearSiteData.js b/browser/components/preferences/tests/siteData/browser_clearSiteData.js
new file mode 100644
index 0000000000..ad1d27bfe2
--- /dev/null
+++ b/browser/components/preferences/tests/siteData/browser_clearSiteData.js
@@ -0,0 +1,243 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { PermissionTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/PermissionTestUtils.sys.mjs"
+);
+
+let useOldClearHistoryDialog = Services.prefs.getBoolPref(
+  "privacy.sanitize.useOldClearHistoryDialog"
+);
+
+async function testClearData(clearSiteData, clearCache) {
+  PermissionTestUtils.add(
+    TEST_QUOTA_USAGE_ORIGIN,
+    "persistent-storage",
+    Services.perms.ALLOW_ACTION
+  );
+
+  // Open a test site which saves into appcache.
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_OFFLINE_URL);
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  // Fill indexedDB with test data.
+  // Don't wait for the page to load, to register the content event handler as quickly as possible.
+  // If this test goes intermittent, we might have to tell the page to wait longer before
+  // firing the event.
+  BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_QUOTA_USAGE_URL, false);
+  await BrowserTestUtils.waitForContentEvent(
+    gBrowser.selectedBrowser,
+    "test-indexedDB-done",
+    false,
+    null,
+    true
+  );
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  // Register some service workers.
+  await loadServiceWorkerTestPage(TEST_SERVICE_WORKER_URL);
+  await promiseServiceWorkerRegisteredFor(TEST_SERVICE_WORKER_URL);
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+
+  // Test the initial states.
+  let cacheUsage = await SiteDataManager.getCacheSize();
+  let quotaUsage = await SiteDataTestUtils.getQuotaUsage(
+    TEST_QUOTA_USAGE_ORIGIN
+  );
+  let totalUsage = await SiteDataManager.getTotalUsage();
+  Assert.greater(cacheUsage, 0, "The cache usage should not be 0");
+  Assert.greater(quotaUsage, 0, "The quota usage should not be 0");
+  Assert.greater(totalUsage, 0, "The total usage should not be 0");
+
+  let initialSizeLabelValue = await SpecialPowers.spawn(
+    gBrowser.selectedBrowser,
+    [],
+    async function () {
+      let sizeLabel = content.document.getElementById("totalSiteDataSize");
+      return sizeLabel.textContent;
+    }
+  );
+
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let clearSiteDataButton = doc.getElementById("clearSiteDataButton");
+
+  let url = useOldClearHistoryDialog
+    ? "chrome://browser/content/preferences/dialogs/clearSiteData.xhtml"
+    : "chrome://browser/content/sanitize_v2.xhtml";
+  let dialogOpened = promiseLoadSubDialog(url);
+  clearSiteDataButton.doCommand();
+  let dialogWin = await dialogOpened;
+
+  // Convert the usage numbers in the same way the UI does it to assert
+  // that they're displayed in the dialog.
+  let [convertedTotalUsage] = DownloadUtils.convertByteUnits(totalUsage);
+  // For cache we just assert that the right unit (KB, probably) is displayed,
+  // since we've had cache intermittently changing under our feet.
+  let [, convertedCacheUnit] = DownloadUtils.convertByteUnits(cacheUsage);
+
+  let cookiesCheckboxId = useOldClearHistoryDialog
+    ? "clearSiteData"
+    : "cookiesAndStorage";
+  let cacheCheckboxId = useOldClearHistoryDialog ? "clearCache" : "cache";
+  let clearSiteDataCheckbox =
+    dialogWin.document.getElementById(cookiesCheckboxId);
+  let clearCacheCheckbox = dialogWin.document.getElementById(cacheCheckboxId);
+  // The usage details are filled asynchronously, so we assert that they're present by
+  // waiting for them to be filled in.
+  await Promise.all([
+    TestUtils.waitForCondition(
+      () =>
+        clearSiteDataCheckbox.label &&
+        clearSiteDataCheckbox.label.includes(convertedTotalUsage),
+      "Should show the quota usage"
+    ),
+    TestUtils.waitForCondition(
+      () =>
+        clearCacheCheckbox.label &&
+        clearCacheCheckbox.label.includes(convertedCacheUnit),
+      "Should show the cache usage"
+    ),
+  ]);
+
+  // Check the boxes according to our test input.
+  clearSiteDataCheckbox.checked = clearSiteData;
+  clearCacheCheckbox.checked = clearCache;
+
+  if (!useOldClearHistoryDialog) {
+    // The new clear history dialog has a seperate checkbox for site settings
+    let siteSettingsCheckbox =
+      dialogWin.document.getElementById("siteSettings");
+    siteSettingsCheckbox.checked = clearSiteData;
+    // select clear everything to match the old dialog boxes behaviour for this test
+    let timespanSelection = dialogWin.document.getElementById(
+      "sanitizeDurationChoice"
+    );
+    timespanSelection.value = 0;
+  }
+  // Some additional promises/assertions to wait for
+  // when deleting site data.
+  let acceptPromise;
+  let updatePromise;
+  let cookiesClearedPromise;
+  if (clearSiteData) {
+    // the new clear history dialog does not have a extra prompt
+    // to clear site data after clicking clear
+    if (useOldClearHistoryDialog) {
+      acceptPromise = BrowserTestUtils.promiseAlertDialogOpen("accept");
+    }
+    updatePromise = promiseSiteDataManagerSitesUpdated();
+    cookiesClearedPromise = promiseCookiesCleared();
+  }
+
+  let dialogClosed = BrowserTestUtils.waitForEvent(dialogWin, "unload");
+
+  let clearButton = dialogWin.document
+    .querySelector("dialog")
+    .getButton("accept");
+  if (!clearSiteData && !clearCache) {
+    // Simulate user input on one of the checkboxes to trigger the event listener for
+    // disabling the clearButton.
+    clearCacheCheckbox.doCommand();
+    // Check that the clearButton gets disabled by unchecking both options.
+    await TestUtils.waitForCondition(
+      () => clearButton.disabled,
+      "Clear button should be disabled"
+    );
+    let cancelButton = dialogWin.document
+      .querySelector("dialog")
+      .getButton("cancel");
+    // Cancel, since we can't delete anything.
+    cancelButton.click();
+  } else {
+    // Delete stuff!
+    clearButton.click();
+  }
+
+  // For site data we display an extra warning dialog, make sure
+  // to accept it.
+  if (clearSiteData && useOldClearHistoryDialog) {
+    await acceptPromise;
+  }
+
+  await dialogClosed;
+
+  if (clearCache) {
+    TestUtils.waitForCondition(async function () {
+      let usage = await SiteDataManager.getCacheSize();
+      return usage == 0;
+    }, "The cache usage should be removed");
+  } else {
+    Assert.greater(
+      await SiteDataManager.getCacheSize(),
+      0,
+      "The cache usage should not be 0"
+    );
+  }
+
+  if (clearSiteData) {
+    await updatePromise;
+    await cookiesClearedPromise;
+    await promiseServiceWorkersCleared();
+
+    TestUtils.waitForCondition(async function () {
+      let usage = await SiteDataManager.getTotalUsage();
+      return usage == 0;
+    }, "The total usage should be removed");
+  } else {
+    quotaUsage = await SiteDataTestUtils.getQuotaUsage(TEST_QUOTA_USAGE_ORIGIN);
+    totalUsage = await SiteDataManager.getTotalUsage();
+    Assert.greater(quotaUsage, 0, "The quota usage should not be 0");
+    Assert.greater(totalUsage, 0, "The total usage should not be 0");
+  }
+
+  if (clearCache || clearSiteData) {
+    // Check that the size label in about:preferences updates after we cleared data.
+    await SpecialPowers.spawn(
+      gBrowser.selectedBrowser,
+      [{ initialSizeLabelValue }],
+      async function (opts) {
+        let sizeLabel = content.document.getElementById("totalSiteDataSize");
+        await ContentTaskUtils.waitForCondition(
+          () => sizeLabel.textContent != opts.initialSizeLabelValue,
+          "Site data size label should have updated."
+        );
+      }
+    );
+  }
+
+  let permission = PermissionTestUtils.getPermissionObject(
+    TEST_QUOTA_USAGE_ORIGIN,
+    "persistent-storage"
+  );
+  is(
+    clearSiteData ? permission : permission.capability,
+    clearSiteData ? null : Services.perms.ALLOW_ACTION,
+    "Should have the correct permission state."
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  await SiteDataManager.removeAll();
+}
+
+// Test opening the "Clear All Data" dialog and cancelling.
+add_task(async function () {
+  await testClearData(false, false);
+});
+
+// Test opening the "Clear All Data" dialog and removing all site data.
+add_task(async function () {
+  await testClearData(true, false);
+});
+
+// Test opening the "Clear All Data" dialog and removing all cache.
+add_task(async function () {
+  await testClearData(false, true);
+});
+
+// Test opening the "Clear All Data" dialog and removing everything.
+add_task(async function () {
+  await testClearData(true, true);
+});
diff --git a/browser/components/preferences/tests/siteData/browser_siteData.js b/browser/components/preferences/tests/siteData/browser_siteData.js
new file mode 100644
index 0000000000..9c421ed295
--- /dev/null
+++ b/browser/components/preferences/tests/siteData/browser_siteData.js
@@ -0,0 +1,395 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+function getPersistentStoragePermStatus(origin) {
+  let uri = Services.io.newURI(origin);
+  let principal = Services.scriptSecurityManager.createContentPrincipal(
+    uri,
+    {}
+  );
+  return Services.perms.testExactPermissionFromPrincipal(
+    principal,
+    "persistent-storage"
+  );
+}
+
+// Test listing site using quota usage or site using appcache
+// This is currently disabled because of bug 1414751.
+add_task(async function () {
+  // Open a test site which would save into appcache
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_OFFLINE_URL);
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  // Open a test site which would save into quota manager
+  BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_QUOTA_USAGE_URL);
+  await BrowserTestUtils.waitForContentEvent(
+    gBrowser.selectedBrowser,
+    "test-indexedDB-done",
+    false,
+    null,
+    true
+  );
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  let updatedPromise = promiseSiteDataManagerSitesUpdated();
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  await updatedPromise;
+  await openSiteDataSettingsDialog();
+  let dialog = content.gSubDialog._topDialog;
+  let dialogFrame = dialog._frame;
+  let frameDoc = dialogFrame.contentDocument;
+
+  let siteItems = frameDoc.getElementsByTagName("richlistitem");
+  is(siteItems.length, 2, "Should list sites using quota usage or appcache");
+
+  let appcacheSite = frameDoc.querySelector(
+    `richlistitem[host="${TEST_OFFLINE_HOST}"]`
+  );
+  ok(appcacheSite, "Should list site using appcache");
+
+  let qoutaUsageSite = frameDoc.querySelector(
+    `richlistitem[host="${TEST_QUOTA_USAGE_HOST}"]`
+  );
+  ok(qoutaUsageSite, "Should list site using quota usage");
+
+  // Always remember to clean up
+  await new Promise(resolve => {
+    let principal =
+      Services.scriptSecurityManager.createContentPrincipalFromOrigin(
+        TEST_QUOTA_USAGE_ORIGIN
+      );
+    let request = Services.qms.clearStoragesForOriginPrefix(principal);
+    request.callback = resolve;
+  });
+
+  await SiteDataManager.removeAll();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+}).skip(); // Bug 1414751
+
+// Test buttons are disabled and loading message shown while updating sites
+add_task(async function () {
+  let updatedPromise = promiseSiteDataManagerSitesUpdated();
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  await updatedPromise;
+  let cacheSize = await SiteDataManager.getCacheSize();
+
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let clearBtn = doc.getElementById("clearSiteDataButton");
+  let settingsButton = doc.getElementById("siteDataSettings");
+  let totalSiteDataSizeLabel = doc.getElementById("totalSiteDataSize");
+  is(
+    clearBtn.disabled,
+    false,
+    "Should enable clear button after sites updated"
+  );
+  is(
+    settingsButton.disabled,
+    false,
+    "Should enable settings button after sites updated"
+  );
+  await SiteDataManager.getTotalUsage().then(usage => {
+    let [value, unit] = DownloadUtils.convertByteUnits(usage + cacheSize);
+    Assert.deepEqual(
+      doc.l10n.getAttributes(totalSiteDataSizeLabel),
+      {
+        id: "sitedata-total-size",
+        args: { value, unit },
+      },
+      "Should show the right total site data size"
+    );
+  });
+
+  Services.obs.notifyObservers(null, "sitedatamanager:updating-sites");
+  is(
+    clearBtn.disabled,
+    true,
+    "Should disable clear button while updating sites"
+  );
+  is(
+    settingsButton.disabled,
+    true,
+    "Should disable settings button while updating sites"
+  );
+  Assert.deepEqual(
+    doc.l10n.getAttributes(totalSiteDataSizeLabel),
+    {
+      id: "sitedata-total-size-calculating",
+      args: null,
+    },
+    "Should show the loading message while updating"
+  );
+
+  Services.obs.notifyObservers(null, "sitedatamanager:sites-updated");
+  is(
+    clearBtn.disabled,
+    false,
+    "Should enable clear button after sites updated"
+  );
+  is(
+    settingsButton.disabled,
+    false,
+    "Should enable settings button after sites updated"
+  );
+  cacheSize = await SiteDataManager.getCacheSize();
+  await SiteDataManager.getTotalUsage().then(usage => {
+    let [value, unit] = DownloadUtils.convertByteUnits(usage + cacheSize);
+    Assert.deepEqual(
+      doc.l10n.getAttributes(totalSiteDataSizeLabel),
+      {
+        id: "sitedata-total-size",
+        args: { value, unit },
+      },
+      "Should show the right total site data size"
+    );
+  });
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+// Test clearing service worker through the settings panel
+add_task(async function () {
+  // Register a test service worker
+  await loadServiceWorkerTestPage(TEST_SERVICE_WORKER_URL);
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  // Test the initial states
+  await promiseServiceWorkerRegisteredFor(TEST_SERVICE_WORKER_URL);
+  // Open the Site Data Settings panel and remove the site
+  await openSiteDataSettingsDialog();
+  let acceptRemovePromise = BrowserTestUtils.promiseAlertDialogOpen("accept");
+  let updatePromise = promiseSiteDataManagerSitesUpdated();
+  SpecialPowers.spawn(
+    gBrowser.selectedBrowser,
+    [{ TEST_OFFLINE_HOST }],
+    args => {
+      let host = args.TEST_OFFLINE_HOST;
+      let frameDoc = content.gSubDialog._topDialog._frame.contentDocument;
+      let sitesList = frameDoc.getElementById("sitesList");
+      let site = sitesList.querySelector(`richlistitem[host="${host}"]`);
+      if (site) {
+        let removeBtn = frameDoc.getElementById("removeSelected");
+        let saveBtn = frameDoc.querySelector("dialog").getButton("accept");
+        site.click();
+        removeBtn.doCommand();
+        saveBtn.doCommand();
+      } else {
+        ok(false, `Should have one site of ${host}`);
+      }
+    }
+  );
+  await acceptRemovePromise;
+  await updatePromise;
+  await promiseServiceWorkersCleared();
+  await SiteDataManager.removeAll();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+// Test showing and removing sites with cookies.
+add_task(async function () {
+  // Add some test cookies.
+  let uri = Services.io.newURI("https://example.com");
+  let uri2 = Services.io.newURI("https://example.org");
+  Services.cookies.add(
+    uri.host,
+    uri.pathQueryRef,
+    "test1",
+    "1",
+    false,
+    false,
+    false,
+    Date.now() + 1000 * 60 * 60,
+    {},
+    Ci.nsICookie.SAMESITE_NONE,
+    Ci.nsICookie.SCHEME_HTTPS
+  );
+  Services.cookies.add(
+    uri.host,
+    uri.pathQueryRef,
+    "test2",
+    "2",
+    false,
+    false,
+    false,
+    Date.now() + 1000 * 60 * 60,
+    {},
+    Ci.nsICookie.SAMESITE_NONE,
+    Ci.nsICookie.SCHEME_HTTPS
+  );
+  Services.cookies.add(
+    uri2.host,
+    uri2.pathQueryRef,
+    "test1",
+    "1",
+    false,
+    false,
+    false,
+    Date.now() + 1000 * 60 * 60,
+    {},
+    Ci.nsICookie.SAMESITE_NONE,
+    Ci.nsICookie.SCHEME_HTTPS
+  );
+
+  // Ensure that private browsing cookies are ignored.
+  Services.cookies.add(
+    uri.host,
+    uri.pathQueryRef,
+    "test3",
+    "3",
+    false,
+    false,
+    false,
+    Date.now() + 1000 * 60 * 60,
+    { privateBrowsingId: 1 },
+    Ci.nsICookie.SAMESITE_NONE,
+    Ci.nsICookie.SCHEME_HTTPS
+  );
+
+  // Get the exact creation date from the cookies (to avoid intermittents
+  // from minimal time differences, since we round up to minutes).
+  let cookies1 = Services.cookies.getCookiesFromHost(uri.host, {});
+  let cookies2 = Services.cookies.getCookiesFromHost(uri2.host, {});
+  // We made two valid cookies for example.com.
+  let cookie1 = cookies1[1];
+  let cookie2 = cookies2[0];
+
+  let fullFormatter = new Services.intl.DateTimeFormat(undefined, {
+    dateStyle: "short",
+    timeStyle: "short",
+  });
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+
+  // Open the site data manager and remove one site.
+  await openSiteDataSettingsDialog();
+  let creationDate1 = new Date(cookie1.lastAccessed / 1000);
+  let creationDate1Formatted = fullFormatter.format(creationDate1);
+  let creationDate2 = new Date(cookie2.lastAccessed / 1000);
+  let creationDate2Formatted = fullFormatter.format(creationDate2);
+  let removeDialogOpenPromise = BrowserTestUtils.promiseAlertDialogOpen(
+    "accept",
+    REMOVE_DIALOG_URL
+  );
+  await SpecialPowers.spawn(
+    gBrowser.selectedBrowser,
+    [
+      {
+        creationDate1Formatted,
+        creationDate2Formatted,
+      },
+    ],
+    function (args) {
+      let frameDoc = content.gSubDialog._topDialog._frame.contentDocument;
+
+      let siteItems = frameDoc.getElementsByTagName("richlistitem");
+      is(siteItems.length, 2, "Should list two sites with cookies");
+      let sitesList = frameDoc.getElementById("sitesList");
+      let site1 = sitesList.querySelector(`richlistitem[host="example.com"]`);
+      let site2 = sitesList.querySelector(`richlistitem[host="example.org"]`);
+
+      let columns = site1.querySelectorAll(".item-box > label");
+      let boxes = site1.querySelectorAll(".item-box");
+      is(columns[0].value, "example.com", "Should show the correct host.");
+      is(columns[1].value, "2", "Should show the correct number of cookies.");
+      is(columns[2].value, "", "Should show no site data.");
+      is(
+        /(now|second)/.test(columns[3].value),
+        true,
+        "Should show the relative date."
+      );
+      is(
+        boxes[3].getAttribute("tooltiptext"),
+        args.creationDate1Formatted,
+        "Should show the correct date."
+      );
+
+      columns = site2.querySelectorAll(".item-box > label");
+      boxes = site2.querySelectorAll(".item-box");
+      is(columns[0].value, "example.org", "Should show the correct host.");
+      is(columns[1].value, "1", "Should show the correct number of cookies.");
+      is(columns[2].value, "", "Should show no site data.");
+      is(
+        /(now|second)/.test(columns[3].value),
+        true,
+        "Should show the relative date."
+      );
+      is(
+        boxes[3].getAttribute("tooltiptext"),
+        args.creationDate2Formatted,
+        "Should show the correct date."
+      );
+
+      let removeBtn = frameDoc.getElementById("removeSelected");
+      let saveBtn = frameDoc.querySelector("dialog").getButton("accept");
+      site2.click();
+      removeBtn.doCommand();
+      saveBtn.doCommand();
+    }
+  );
+  await removeDialogOpenPromise;
+
+  await TestUtils.waitForCondition(
+    () => Services.cookies.countCookiesFromHost(uri2.host) == 0,
+    "Cookies from the first host should be cleared"
+  );
+  is(
+    Services.cookies.countCookiesFromHost(uri.host),
+    2,
+    "Cookies from the second host should not be cleared"
+  );
+
+  // Open the site data manager and remove another site.
+  await openSiteDataSettingsDialog();
+  let acceptRemovePromise = BrowserTestUtils.promiseAlertDialogOpen("accept");
+  await SpecialPowers.spawn(
+    gBrowser.selectedBrowser,
+    [{ creationDate1Formatted }],
+    function (args) {
+      let frameDoc = content.gSubDialog._topDialog._frame.contentDocument;
+
+      let siteItems = frameDoc.getElementsByTagName("richlistitem");
+      is(siteItems.length, 1, "Should list one site with cookies");
+      let sitesList = frameDoc.getElementById("sitesList");
+      let site1 = sitesList.querySelector(`richlistitem[host="example.com"]`);
+
+      let columns = site1.querySelectorAll(".item-box > label");
+      let boxes = site1.querySelectorAll(".item-box");
+      is(columns[0].value, "example.com", "Should show the correct host.");
+      is(columns[1].value, "2", "Should show the correct number of cookies.");
+      is(columns[2].value, "", "Should show no site data.");
+      is(
+        /(now|second)/.test(columns[3].value),
+        true,
+        "Should show the relative date."
+      );
+      is(
+        boxes[3].getAttribute("tooltiptext"),
+        args.creationDate1Formatted,
+        "Should show the correct date."
+      );
+
+      let removeBtn = frameDoc.getElementById("removeSelected");
+      let saveBtn = frameDoc.querySelector("dialog").getButton("accept");
+      site1.click();
+      removeBtn.doCommand();
+      saveBtn.doCommand();
+    }
+  );
+  await acceptRemovePromise;
+
+  await TestUtils.waitForCondition(
+    () => Services.cookies.countCookiesFromHost(uri.host) == 0,
+    "Cookies from the second host should be cleared"
+  );
+
+  await openSiteDataSettingsDialog();
+
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], function () {
+    let frameDoc = content.gSubDialog._topDialog._frame.contentDocument;
+
+    let siteItems = frameDoc.getElementsByTagName("richlistitem");
+    is(siteItems.length, 0, "Should list no sites with cookies");
+  });
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/siteData/browser_siteData2.js b/browser/components/preferences/tests/siteData/browser_siteData2.js
new file mode 100644
index 0000000000..863a8dcefe
--- /dev/null
+++ b/browser/components/preferences/tests/siteData/browser_siteData2.js
@@ -0,0 +1,475 @@
+"use strict";
+
+function assertAllSitesNotListed(win) {
+  let frameDoc = win.gSubDialog._topDialog._frame.contentDocument;
+  let removeBtn = frameDoc.getElementById("removeSelected");
+  let removeAllBtn = frameDoc.getElementById("removeAll");
+  let sitesList = frameDoc.getElementById("sitesList");
+  let sites = sitesList.getElementsByTagName("richlistitem");
+  is(sites.length, 0, "Should not list all sites");
+  is(removeBtn.disabled, true, "Should disable the removeSelected button");
+  is(removeAllBtn.disabled, true, "Should disable the removeAllBtn button");
+}
+
+// Test selecting and removing all sites one by one
+add_task(async function test_selectRemove() {
+  let hosts = await addTestData([
+    {
+      usage: 1024,
+      origin: "https://account.xyz.com",
+      persisted: true,
+    },
+    {
+      usage: 1024,
+      origin: "https://shopping.xyz.com",
+    },
+    {
+      usage: 1024,
+      origin: "http://cinema.bar.com",
+      persisted: true,
+    },
+    {
+      usage: 1024,
+      origin: "http://email.bar.com",
+    },
+  ]);
+
+  let updatePromise = promiseSiteDataManagerSitesUpdated();
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  await updatePromise;
+  await openSiteDataSettingsDialog();
+
+  let win = gBrowser.selectedBrowser.contentWindow;
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let frameDoc = null;
+  let saveBtn = null;
+  let cancelBtn = null;
+  let settingsDialogClosePromise = null;
+
+  // Test the initial state
+  assertSitesListed(doc, hosts);
+
+  // Test the "Cancel" button
+  settingsDialogClosePromise = promiseSettingsDialogClose();
+  frameDoc = win.gSubDialog._topDialog._frame.contentDocument;
+  cancelBtn = frameDoc.querySelector("dialog").getButton("cancel");
+  removeAllSitesOneByOne();
+  assertAllSitesNotListed(win);
+  cancelBtn.doCommand();
+  await settingsDialogClosePromise;
+  await openSiteDataSettingsDialog();
+  assertSitesListed(doc, hosts);
+
+  // Test the "Save Changes" button but cancelling save
+  let cancelPromise = BrowserTestUtils.promiseAlertDialogOpen("cancel");
+  settingsDialogClosePromise = promiseSettingsDialogClose();
+  frameDoc = win.gSubDialog._topDialog._frame.contentDocument;
+  saveBtn = frameDoc.querySelector("dialog").getButton("accept");
+  cancelBtn = frameDoc.querySelector("dialog").getButton("cancel");
+  removeAllSitesOneByOne();
+  assertAllSitesNotListed(win);
+  saveBtn.doCommand();
+  await cancelPromise;
+  cancelBtn.doCommand();
+  await settingsDialogClosePromise;
+  await openSiteDataSettingsDialog();
+  assertSitesListed(doc, hosts);
+
+  // Test the "Save Changes" button and accepting save
+  let acceptPromise = BrowserTestUtils.promiseAlertDialogOpen("accept");
+  settingsDialogClosePromise = promiseSettingsDialogClose();
+  updatePromise = promiseSiteDataManagerSitesUpdated();
+  frameDoc = win.gSubDialog._topDialog._frame.contentDocument;
+  saveBtn = frameDoc.querySelector("dialog").getButton("accept");
+  removeAllSitesOneByOne();
+  assertAllSitesNotListed(win);
+  saveBtn.doCommand();
+  await acceptPromise;
+  await settingsDialogClosePromise;
+  await updatePromise;
+  await openSiteDataSettingsDialog();
+  assertAllSitesNotListed(win);
+
+  await SiteDataTestUtils.clear();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  function removeAllSitesOneByOne() {
+    frameDoc = win.gSubDialog._topDialog._frame.contentDocument;
+    let removeBtn = frameDoc.getElementById("removeSelected");
+    let sitesList = frameDoc.getElementById("sitesList");
+    let sites = sitesList.getElementsByTagName("richlistitem");
+    for (let i = sites.length - 1; i >= 0; --i) {
+      sites[i].click();
+      removeBtn.doCommand();
+    }
+  }
+});
+
+// Test selecting and removing partial sites
+add_task(async function test_removePartialSites() {
+  let hosts = await addTestData([
+    {
+      usage: 1024,
+      origin: "https://account.xyz.com",
+      persisted: true,
+    },
+    {
+      usage: 1024,
+      origin: "https://shopping.xyz.com",
+      persisted: false,
+    },
+    {
+      usage: 1024,
+      origin: "http://cinema.bar.com",
+      persisted: true,
+    },
+    {
+      usage: 1024,
+      origin: "http://email.bar.com",
+      persisted: false,
+    },
+    {
+      usage: 1024,
+      origin: "https://s3-us-west-2.amazonaws.com",
+      persisted: true,
+    },
+    {
+      usage: 1024,
+      origin: "https://127.0.0.1",
+      persisted: false,
+    },
+  ]);
+
+  let updatePromise = promiseSiteDataManagerSitesUpdated();
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  await updatePromise;
+  await openSiteDataSettingsDialog();
+
+  let win = gBrowser.selectedBrowser.contentWindow;
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let frameDoc = null;
+  let saveBtn = null;
+  let cancelBtn = null;
+  let removeDialogOpenPromise = null;
+  let settingsDialogClosePromise = null;
+
+  // Test the initial state
+  assertSitesListed(doc, hosts);
+
+  // Test the "Cancel" button
+  settingsDialogClosePromise = promiseSettingsDialogClose();
+  frameDoc = win.gSubDialog._topDialog._frame.contentDocument;
+  cancelBtn = frameDoc.querySelector("dialog").getButton("cancel");
+  await removeSelectedSite(hosts.slice(0, 2));
+  assertSitesListed(doc, hosts.slice(2));
+  cancelBtn.doCommand();
+  await settingsDialogClosePromise;
+  await openSiteDataSettingsDialog();
+  assertSitesListed(doc, hosts);
+
+  // Test the "Save Changes" button but canceling save
+  removeDialogOpenPromise = BrowserTestUtils.promiseAlertDialogOpen(
+    "cancel",
+    REMOVE_DIALOG_URL
+  );
+  settingsDialogClosePromise = promiseSettingsDialogClose();
+  frameDoc = win.gSubDialog._topDialog._frame.contentDocument;
+  saveBtn = frameDoc.querySelector("dialog").getButton("accept");
+  cancelBtn = frameDoc.querySelector("dialog").getButton("cancel");
+  await removeSelectedSite(hosts.slice(0, 2));
+  assertSitesListed(doc, hosts.slice(2));
+  saveBtn.doCommand();
+  await removeDialogOpenPromise;
+  cancelBtn.doCommand();
+  await settingsDialogClosePromise;
+  await openSiteDataSettingsDialog();
+  assertSitesListed(doc, hosts);
+
+  // Test the "Save Changes" button and accepting save
+  removeDialogOpenPromise = BrowserTestUtils.promiseAlertDialogOpen(
+    "accept",
+    REMOVE_DIALOG_URL
+  );
+  settingsDialogClosePromise = promiseSettingsDialogClose();
+  frameDoc = win.gSubDialog._topDialog._frame.contentDocument;
+  saveBtn = frameDoc.querySelector("dialog").getButton("accept");
+  await removeSelectedSite(hosts.slice(0, 2));
+  assertSitesListed(doc, hosts.slice(2));
+  saveBtn.doCommand();
+  await removeDialogOpenPromise;
+  await settingsDialogClosePromise;
+  await openSiteDataSettingsDialog();
+  assertSitesListed(doc, hosts.slice(2));
+
+  await SiteDataTestUtils.clear();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  function removeSelectedSite(removeHosts) {
+    frameDoc = win.gSubDialog._topDialog._frame.contentDocument;
+    let removeBtn = frameDoc.getElementById("removeSelected");
+    is(
+      removeBtn.disabled,
+      true,
+      "Should start with disabled removeSelected button"
+    );
+    let sitesList = frameDoc.getElementById("sitesList");
+    removeHosts.forEach(host => {
+      let site = sitesList.querySelector(`richlistitem[host="${host}"]`);
+      if (site) {
+        site.click();
+        let currentSelectedIndex = sitesList.selectedIndex;
+        is(
+          removeBtn.disabled,
+          false,
+          "Should enable the removeSelected button"
+        );
+        removeBtn.doCommand();
+        let newSelectedIndex = sitesList.selectedIndex;
+        if (currentSelectedIndex >= sitesList.itemCount) {
+          is(newSelectedIndex, currentSelectedIndex - 1);
+        } else {
+          is(newSelectedIndex, currentSelectedIndex);
+        }
+      } else {
+        ok(false, `Should not select and remove inexistent site of ${host}`);
+      }
+    });
+  }
+});
+
+// Test searching and then removing only visible sites
+add_task(async function () {
+  let hosts = await addTestData([
+    {
+      usage: 1024,
+      origin: "https://account.xyz.com",
+      persisted: true,
+    },
+    {
+      usage: 1024,
+      origin: "https://shopping.xyz.com",
+      persisted: false,
+    },
+    {
+      usage: 1024,
+      origin: "http://cinema.bar.com",
+      persisted: true,
+    },
+    {
+      usage: 1024,
+      origin: "http://email.bar.com",
+      persisted: false,
+    },
+  ]);
+
+  let updatePromise = promiseSiteDataManagerSitesUpdated();
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  await updatePromise;
+  await openSiteDataSettingsDialog();
+
+  // Search "foo" to only list foo.com sites
+  let win = gBrowser.selectedBrowser.contentWindow;
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let frameDoc = win.gSubDialog._topDialog._frame.contentDocument;
+  let searchBox = frameDoc.getElementById("searchBox");
+  searchBox.value = "xyz";
+  searchBox.doCommand();
+  assertSitesListed(
+    doc,
+    hosts.filter(host => host.includes("xyz"))
+  );
+
+  // Test only removing all visible sites listed
+  updatePromise = promiseSiteDataManagerSitesUpdated();
+  let acceptRemovePromise = BrowserTestUtils.promiseAlertDialogOpen(
+    "accept",
+    REMOVE_DIALOG_URL
+  );
+  let settingsDialogClosePromise = promiseSettingsDialogClose();
+  let removeAllBtn = frameDoc.getElementById("removeAll");
+  let saveBtn = frameDoc.querySelector("dialog").getButton("accept");
+  removeAllBtn.doCommand();
+  saveBtn.doCommand();
+  await acceptRemovePromise;
+  await settingsDialogClosePromise;
+  await updatePromise;
+  await openSiteDataSettingsDialog();
+  assertSitesListed(
+    doc,
+    hosts.filter(host => !host.includes("xyz"))
+  );
+
+  await SiteDataTestUtils.clear();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+// Test dynamically clearing all site data
+add_task(async function () {
+  let hosts = await addTestData([
+    {
+      usage: 1024,
+      origin: "https://account.xyz.com",
+      persisted: true,
+    },
+    {
+      usage: 1024,
+      origin: "https://shopping.xyz.com",
+      persisted: false,
+    },
+  ]);
+
+  let updatePromise = promiseSiteDataManagerSitesUpdated();
+
+  // Test the initial state
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  await updatePromise;
+  await openSiteDataSettingsDialog();
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  assertSitesListed(doc, hosts);
+
+  await addTestData([
+    {
+      usage: 1024,
+      origin: "http://cinema.bar.com",
+      persisted: true,
+    },
+    {
+      usage: 1024,
+      origin: "http://email.bar.com",
+      persisted: false,
+    },
+  ]);
+
+  // Test clearing all site data dynamically
+  let win = gBrowser.selectedBrowser.contentWindow;
+  let frameDoc = win.gSubDialog._topDialog._frame.contentDocument;
+  updatePromise = promiseSiteDataManagerSitesUpdated();
+  let acceptRemovePromise = BrowserTestUtils.promiseAlertDialogOpen("accept");
+  let settingsDialogClosePromise = promiseSettingsDialogClose();
+  let removeAllBtn = frameDoc.getElementById("removeAll");
+  let saveBtn = frameDoc.querySelector("dialog").getButton("accept");
+  removeAllBtn.doCommand();
+  saveBtn.doCommand();
+  await acceptRemovePromise;
+  await settingsDialogClosePromise;
+  await updatePromise;
+  await openSiteDataSettingsDialog();
+  assertAllSitesNotListed(win);
+
+  await SiteDataTestUtils.clear();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+// Tests clearing search box content via backspace does not delete site data
+add_task(async function () {
+  let hosts = await addTestData([
+    {
+      usage: 1024,
+      origin: "https://account.xyz.com",
+      persisted: true,
+    },
+    {
+      usage: 1024,
+      origin: "https://shopping.xyz.com",
+      persisted: false,
+    },
+    {
+      usage: 1024,
+      origin: "http://cinema.bar.com",
+      persisted: true,
+    },
+    {
+      usage: 1024,
+      origin: "http://email.bar.com",
+      persisted: false,
+    },
+  ]);
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  await openSiteDataSettingsDialog();
+
+  let win = gBrowser.selectedBrowser.contentWindow;
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let frameDoc = win.gSubDialog._topDialog._frame.contentDocument;
+  let searchBox = frameDoc.getElementById("searchBox");
+  searchBox.value = "xyz";
+  searchBox.doCommand();
+  assertSitesListed(
+    doc,
+    hosts.filter(host => host.includes("xyz"))
+  );
+
+  // Make sure the focus is on the search box
+  searchBox.focus();
+  if (AppConstants.platform == "macosx") {
+    EventUtils.synthesizeKey("VK_BACK_SPACE", {}, win);
+  } else {
+    EventUtils.synthesizeKey("VK_DELETE", {}, win);
+  }
+  assertSitesListed(
+    doc,
+    hosts.filter(host => host.includes("xyz"))
+  );
+
+  await SiteDataTestUtils.clear();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+// Tests remove site data via backspace
+add_task(async function () {
+  let hosts = await addTestData([
+    {
+      usage: 1024,
+      origin: "https://account.xyz.com",
+      persisted: true,
+    },
+    {
+      usage: 1024,
+      origin: "https://shopping.xyz.com",
+      persisted: false,
+    },
+    {
+      usage: 1024,
+      origin: "http://cinema.bar.com",
+      persisted: true,
+    },
+    {
+      usage: 1024,
+      origin: "http://email.bar.com",
+      persisted: false,
+    },
+  ]);
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  await openSiteDataSettingsDialog();
+
+  let win = gBrowser.selectedBrowser.contentWindow;
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let frameDoc = win.gSubDialog._topDialog._frame.contentDocument;
+  // Test initial state
+  assertSitesListed(doc, hosts);
+
+  let sitesList = frameDoc.getElementById("sitesList");
+  let site = sitesList.querySelector(`richlistitem[host="xyz.com"]`);
+  if (site) {
+    // Move the focus from the search box to the list and select an item
+    sitesList.focus();
+    site.click();
+    if (AppConstants.platform == "macosx") {
+      EventUtils.synthesizeKey("VK_BACK_SPACE", {}, win);
+    } else {
+      EventUtils.synthesizeKey("VK_DELETE", {}, win);
+    }
+  }
+
+  assertSitesListed(
+    doc,
+    hosts.filter(host => !host.includes("xyz"))
+  );
+
+  await SiteDataTestUtils.clear();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/siteData/browser_siteData3.js b/browser/components/preferences/tests/siteData/browser_siteData3.js
new file mode 100644
index 0000000000..9a4aa4cd0a
--- /dev/null
+++ b/browser/components/preferences/tests/siteData/browser_siteData3.js
@@ -0,0 +1,328 @@
+"use strict";
+
+// Test not displaying sites which store 0 byte and don't have persistent storage.
+add_task(async function test_exclusions() {
+  let hosts = await addTestData([
+    {
+      usage: 0,
+      origin: "https://account.xyz.com",
+      persisted: true,
+    },
+    {
+      usage: 0,
+      origin: "https://shopping.xyz.com",
+      persisted: false,
+    },
+    {
+      usage: 1024,
+      origin: "http://cinema.bar.com",
+      persisted: true,
+    },
+    {
+      usage: 1024,
+      origin: "http://email.bar.com",
+      persisted: false,
+    },
+    {
+      usage: 0,
+      origin: "http://cookies.bar.com",
+      cookies: 5,
+      persisted: false,
+    },
+  ]);
+
+  let updatePromise = promiseSiteDataManagerSitesUpdated();
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  await updatePromise;
+  await openSiteDataSettingsDialog();
+  assertSitesListed(
+    doc,
+    hosts.filter(host => host != "shopping.xyz.com")
+  );
+
+  await SiteDataTestUtils.clear();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+// Test grouping and listing sites across scheme, port and origin attributes by base domain.
+add_task(async function test_grouping() {
+  let quotaUsage = 7000000;
+  let testData = [
+    {
+      usage: quotaUsage,
+      origin: "https://account.xyz.com^userContextId=1",
+      cookies: 2,
+      persisted: true,
+    },
+    {
+      usage: quotaUsage,
+      origin: "https://account.xyz.com",
+      cookies: 1,
+      persisted: false,
+    },
+    {
+      usage: quotaUsage,
+      origin: "https://account.xyz.com:123",
+      cookies: 1,
+      persisted: false,
+    },
+    {
+      usage: quotaUsage,
+      origin: "http://account.xyz.com",
+      cookies: 1,
+      persisted: false,
+    },
+    {
+      usage: quotaUsage,
+      origin: "http://search.xyz.com",
+      cookies: 3,
+      persisted: false,
+    },
+    {
+      usage: quotaUsage,
+      origin: "http://advanced.search.xyz.com",
+      cookies: 3,
+      persisted: true,
+    },
+    {
+      usage: quotaUsage,
+      origin: "http://xyz.com",
+      cookies: 1,
+      persisted: false,
+    },
+  ];
+  await addTestData(testData);
+
+  let updatedPromise = promiseSiteDataManagerSitesUpdated();
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  await updatedPromise;
+  await openSiteDataSettingsDialog();
+  let win = gBrowser.selectedBrowser.contentWindow;
+  let dialogFrame = win.gSubDialog._topDialog._frame;
+  let frameDoc = dialogFrame.contentDocument;
+
+  let siteItems = frameDoc.getElementsByTagName("richlistitem");
+  is(
+    siteItems.length,
+    1,
+    "Should group sites across scheme, port and origin attributes"
+  );
+
+  let columns = siteItems[0].querySelectorAll(".item-box > label");
+
+  let expected = "xyz.com";
+  is(columns[0].value, expected, "Should group and list sites by host");
+
+  let cookieCount = testData.reduce((count, { cookies }) => count + cookies, 0);
+  is(
+    columns[1].value,
+    cookieCount.toString(),
+    "Should group cookies across scheme, port and origin attributes"
+  );
+
+  let [value, unit] = DownloadUtils.convertByteUnits(quotaUsage * 4);
+  let l10nAttributes = frameDoc.l10n.getAttributes(columns[2]);
+  is(
+    l10nAttributes.id,
+    "site-storage-persistent",
+    "Should show the site as persistent if one origin is persistent."
+  );
+  // The shown quota can be slightly larger than the raw data we put in (though it should
+  // never be smaller), but that doesn't really matter to us since we only want to test that
+  // the site data dialog accumulates this into a single column.
+  Assert.greaterOrEqual(
+    parseFloat(l10nAttributes.args.value),
+    parseFloat(value),
+    "Should show the correct accumulated quota size."
+  );
+  is(
+    l10nAttributes.args.unit,
+    unit,
+    "Should show the correct quota size unit."
+  );
+
+  await SiteDataTestUtils.clear();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+// Test sorting
+add_task(async function test_sorting() {
+  let testData = [
+    {
+      usage: 1024,
+      origin: "https://account.xyz.com",
+      cookies: 6,
+      persisted: true,
+    },
+    {
+      usage: 1024 * 2,
+      origin: "https://books.foo.com",
+      cookies: 0,
+      persisted: false,
+    },
+    {
+      usage: 1024 * 3,
+      origin: "http://cinema.bar.com",
+      cookies: 3,
+      persisted: true,
+    },
+    {
+      usage: 1024 * 3,
+      origin: "http://vod.bar.com",
+      cookies: 2,
+      persisted: false,
+    },
+  ];
+
+  await addTestData(testData);
+
+  let updatePromise = promiseSiteDataManagerSitesUpdated();
+
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  await updatePromise;
+  await openSiteDataSettingsDialog();
+
+  let dialog = content.gSubDialog._topDialog;
+  let dialogFrame = dialog._frame;
+  let frameDoc = dialogFrame.contentDocument;
+  let hostCol = frameDoc.getElementById("hostCol");
+  let usageCol = frameDoc.getElementById("usageCol");
+  let cookiesCol = frameDoc.getElementById("cookiesCol");
+  let sitesList = frameDoc.getElementById("sitesList");
+
+  function getHostOrder() {
+    let siteItems = sitesList.getElementsByTagName("richlistitem");
+    return Array.from(siteItems).map(item => item.getAttribute("host"));
+  }
+
+  // Test default sorting by usage, descending.
+  Assert.deepEqual(
+    getHostOrder(),
+    ["bar.com", "foo.com", "xyz.com"],
+    "Has sorted descending by usage"
+  );
+
+  // Test sorting on the usage column
+  usageCol.click();
+  Assert.deepEqual(
+    getHostOrder(),
+    ["xyz.com", "foo.com", "bar.com"],
+    "Has sorted ascending by usage"
+  );
+  usageCol.click();
+  Assert.deepEqual(
+    getHostOrder(),
+    ["bar.com", "foo.com", "xyz.com"],
+    "Has sorted descending by usage"
+  );
+
+  // Test sorting on the host column
+  hostCol.click();
+  Assert.deepEqual(
+    getHostOrder(),
+    ["bar.com", "foo.com", "xyz.com"],
+    "Has sorted ascending by base domain"
+  );
+  hostCol.click();
+  Assert.deepEqual(
+    getHostOrder(),
+    ["xyz.com", "foo.com", "bar.com"],
+    "Has sorted descending by base domain"
+  );
+
+  // Test sorting on the cookies column
+  cookiesCol.click();
+  Assert.deepEqual(
+    getHostOrder(),
+    ["foo.com", "bar.com", "xyz.com"],
+    "Has sorted ascending by cookies"
+  );
+  cookiesCol.click();
+  Assert.deepEqual(
+    getHostOrder(),
+    ["xyz.com", "bar.com", "foo.com"],
+    "Has sorted descending by cookies"
+  );
+
+  await SiteDataTestUtils.clear();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+// Test single entry removal
+add_task(async function test_single_entry_removal() {
+  let testData = await addTestData([
+    {
+      usage: 1024,
+      origin: "https://xyz.com",
+      cookies: 6,
+      persisted: true,
+    },
+    {
+      usage: 1024 * 3,
+      origin: "http://bar.com",
+      cookies: 2,
+      persisted: false,
+    },
+  ]);
+
+  let updatePromise = promiseSiteDataManagerSitesUpdated();
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  await updatePromise;
+  await openSiteDataSettingsDialog();
+
+  let dialog = content.gSubDialog._topDialog;
+  let dialogFrame = dialog._frame;
+  let frameDoc = dialogFrame.contentDocument;
+
+  let sitesList = frameDoc.getElementById("sitesList");
+  let host = testData[0];
+  let site = sitesList.querySelector(`richlistitem[host="${host}"]`);
+  sitesList.addItemToSelection(site);
+  frameDoc.getElementById("removeSelected").doCommand();
+  let saveChangesButton = frameDoc.querySelector("dialog").getButton("accept");
+  let dialogOpened = BrowserTestUtils.promiseAlertDialogOpen(
+    null,
+    REMOVE_DIALOG_URL
+  );
+  setTimeout(() => saveChangesButton.doCommand(), 0);
+  let dialogWin = await dialogOpened;
+  let rootElement = dialogWin.document.getElementById(
+    "SiteDataRemoveSelectedDialog"
+  );
+  is(rootElement.classList.length, 1, "There should only be one class set");
+  is(
+    rootElement.classList[0],
+    "single-entry",
+    "The only class set should be single-entry (to hide the list)"
+  );
+  let description = dialogWin.document.getElementById("removing-description");
+  is(
+    description.getAttribute("data-l10n-id"),
+    "site-data-removing-single-desc",
+    "The description for single site should be selected"
+  );
+
+  let removalList = dialogWin.document.getElementById("removalList");
+  is(
+    BrowserTestUtils.isVisible(removalList),
+    false,
+    "The removal list should be invisible"
+  );
+  let removeButton = dialogWin.document
+    .querySelector("dialog")
+    .getButton("accept");
+  let dialogClosed = BrowserTestUtils.waitForEvent(dialogWin, "unload");
+  updatePromise = promiseSiteDataManagerSitesUpdated();
+  removeButton.doCommand();
+  await dialogClosed;
+  await updatePromise;
+  await openSiteDataSettingsDialog();
+
+  dialog = content.gSubDialog._topDialog;
+  dialogFrame = dialog._frame;
+  frameDoc = dialogFrame.contentDocument;
+  assertSitesListed(frameDoc, testData.slice(1));
+  await SiteDataTestUtils.clear();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/siteData/browser_siteData_multi_select.js b/browser/components/preferences/tests/siteData/browser_siteData_multi_select.js
new file mode 100644
index 0000000000..5ce9d7e1e1
--- /dev/null
+++ b/browser/components/preferences/tests/siteData/browser_siteData_multi_select.js
@@ -0,0 +1,119 @@
+"use strict";
+
+// Test selecting and removing partial sites
+add_task(async function () {
+  await SiteDataTestUtils.clear();
+
+  let hosts = await addTestData([
+    {
+      usage: 1024,
+      origin: "https://127.0.0.1",
+      persisted: false,
+    },
+    {
+      usage: 1024 * 4,
+      origin: "http://cinema.bar.com",
+      persisted: true,
+    },
+    {
+      usage: 1024 * 3,
+      origin: "http://email.bar.com",
+      persisted: false,
+    },
+    {
+      usage: 1024 * 2,
+      origin: "https://s3-us-west-2.amazonaws.com",
+      persisted: true,
+    },
+    {
+      usage: 1024 * 6,
+      origin: "https://account.xyz.com",
+      persisted: true,
+    },
+    {
+      usage: 1024 * 5,
+      origin: "https://shopping.xyz.com",
+      persisted: false,
+    },
+    {
+      usage: 1024 * 5,
+      origin: "https://example.com",
+      persisted: false,
+    },
+    {
+      usage: 1024 * 5,
+      origin: "https://example.net",
+      persisted: false,
+    },
+  ]);
+
+  // Align the order of test hosts with the order of the site data table.
+  hosts.sort();
+
+  let updatePromise = promiseSiteDataManagerSitesUpdated();
+  await openPreferencesViaOpenPreferencesAPI("privacy", { leaveOpen: true });
+  await updatePromise;
+  await openSiteDataSettingsDialog();
+
+  let doc = gBrowser.selectedBrowser.contentDocument;
+
+  // Test the initial state
+  assertSitesListed(doc, hosts);
+  let win = gBrowser.selectedBrowser.contentWindow;
+  let frameDoc = win.gSubDialog._topDialog._frame.contentDocument;
+  let removeBtn = frameDoc.getElementById("removeSelected");
+  is(
+    removeBtn.disabled,
+    true,
+    "Should start with disabled removeSelected button"
+  );
+
+  let hostCol = frameDoc.getElementById("hostCol");
+  hostCol.click();
+
+  let removeDialogOpenPromise = BrowserTestUtils.promiseAlertDialogOpen(
+    "accept",
+    REMOVE_DIALOG_URL
+  );
+  let settingsDialogClosePromise = promiseSettingsDialogClose();
+
+  // Select some sites to remove.
+  let sitesList = frameDoc.getElementById("sitesList");
+  hosts.slice(0, 2).forEach(host => {
+    let site = sitesList.querySelector(`richlistitem[host="${host}"]`);
+    sitesList.addItemToSelection(site);
+  });
+
+  is(removeBtn.disabled, false, "Should enable the removeSelected button");
+  removeBtn.doCommand();
+  is(sitesList.selectedIndex, 0, "Should select next item");
+  assertSitesListed(doc, hosts.slice(2));
+
+  // Select some other sites to remove with Delete.
+  hosts.slice(2, 4).forEach(host => {
+    let site = sitesList.querySelector(`richlistitem[host="${host}"]`);
+    sitesList.addItemToSelection(site);
+  });
+
+  is(removeBtn.disabled, false, "Should enable the removeSelected button");
+  // Move the focus from the search box to the list
+  sitesList.focus();
+  EventUtils.synthesizeKey("VK_DELETE");
+  is(sitesList.selectedIndex, 0, "Should select next item");
+  assertSitesListed(doc, hosts.slice(4));
+
+  updatePromise = promiseSiteDataManagerSitesUpdated();
+  let saveBtn = frameDoc.querySelector("dialog").getButton("accept");
+  saveBtn.doCommand();
+
+  await removeDialogOpenPromise;
+  await settingsDialogClosePromise;
+
+  await updatePromise;
+  await openSiteDataSettingsDialog();
+
+  assertSitesListed(doc, hosts.slice(4));
+
+  await SiteDataTestUtils.clear();
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/components/preferences/tests/siteData/head.js b/browser/components/preferences/tests/siteData/head.js
new file mode 100644
index 0000000000..2b8a9984a6
--- /dev/null
+++ b/browser/components/preferences/tests/siteData/head.js
@@ -0,0 +1,283 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const TEST_QUOTA_USAGE_HOST = "example.com";
+const TEST_QUOTA_USAGE_ORIGIN = "https://" + TEST_QUOTA_USAGE_HOST;
+const TEST_QUOTA_USAGE_URL =
+  getRootDirectory(gTestPath).replace(
+    "chrome://mochitests/content",
+    TEST_QUOTA_USAGE_ORIGIN
+  ) + "/site_data_test.html";
+const TEST_OFFLINE_HOST = "example.org";
+const TEST_OFFLINE_ORIGIN = "https://" + TEST_OFFLINE_HOST;
+const TEST_OFFLINE_URL =
+  getRootDirectory(gTestPath).replace(
+    "chrome://mochitests/content",
+    TEST_OFFLINE_ORIGIN
+  ) + "/offline/offline.html";
+const TEST_SERVICE_WORKER_URL =
+  getRootDirectory(gTestPath).replace(
+    "chrome://mochitests/content",
+    TEST_OFFLINE_ORIGIN
+  ) + "/service_worker_test.html";
+
+const REMOVE_DIALOG_URL =
+  "chrome://browser/content/preferences/dialogs/siteDataRemoveSelected.xhtml";
+
+ChromeUtils.defineESModuleGetters(this, {
+  SiteDataTestUtils: "resource://testing-common/SiteDataTestUtils.sys.mjs",
+});
+
+XPCOMUtils.defineLazyServiceGetter(
+  this,
+  "serviceWorkerManager",
+  "@mozilla.org/serviceworkers/manager;1",
+  "nsIServiceWorkerManager"
+);
+
+function promiseSiteDataManagerSitesUpdated() {
+  return TestUtils.topicObserved("sitedatamanager:sites-updated", () => true);
+}
+
+function is_element_visible(aElement, aMsg) {
+  isnot(aElement, null, "Element should not be null, when checking visibility");
+  ok(!BrowserTestUtils.isHidden(aElement), aMsg);
+}
+
+function is_element_hidden(aElement, aMsg) {
+  isnot(aElement, null, "Element should not be null, when checking visibility");
+  ok(BrowserTestUtils.isHidden(aElement), aMsg);
+}
+
+function promiseLoadSubDialog(aURL) {
+  return new Promise((resolve, reject) => {
+    content.gSubDialog._dialogStack.addEventListener(
+      "dialogopen",
+      function dialogopen(aEvent) {
+        if (
+          aEvent.detail.dialog._frame.contentWindow.location == "about:blank"
+        ) {
+          return;
+        }
+        content.gSubDialog._dialogStack.removeEventListener(
+          "dialogopen",
+          dialogopen
+        );
+
+        is(
+          aEvent.detail.dialog._frame.contentWindow.location.toString(),
+          aURL,
+          "Check the proper URL is loaded"
+        );
+
+        // Check visibility
+        is_element_visible(aEvent.detail.dialog._overlay, "Overlay is visible");
+
+        // Check that stylesheets were injected
+        let expectedStyleSheetURLs =
+          aEvent.detail.dialog._injectedStyleSheets.slice(0);
+        for (let styleSheet of aEvent.detail.dialog._frame.contentDocument
+          .styleSheets) {
+          let i = expectedStyleSheetURLs.indexOf(styleSheet.href);
+          if (i >= 0) {
+            info("found " + styleSheet.href);
+            expectedStyleSheetURLs.splice(i, 1);
+          }
+        }
+        is(
+          expectedStyleSheetURLs.length,
+          0,
+          "All expectedStyleSheetURLs should have been found"
+        );
+
+        // Wait for the next event tick to make sure the remaining part of the
+        // testcase runs after the dialog gets ready for input.
+        executeSoon(() => resolve(aEvent.detail.dialog._frame.contentWindow));
+      }
+    );
+  });
+}
+
+function openPreferencesViaOpenPreferencesAPI(aPane, aOptions) {
+  return new Promise(resolve => {
+    let finalPrefPaneLoaded = TestUtils.topicObserved(
+      "sync-pane-loaded",
+      () => true
+    );
+    gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser, "about:blank");
+    openPreferences(aPane);
+    let newTabBrowser = gBrowser.selectedBrowser;
+
+    newTabBrowser.addEventListener(
+      "Initialized",
+      function () {
+        newTabBrowser.contentWindow.addEventListener(
+          "load",
+          async function () {
+            let win = gBrowser.contentWindow;
+            let selectedPane = win.history.state;
+            await finalPrefPaneLoaded;
+            if (!aOptions || !aOptions.leaveOpen) {
+              gBrowser.removeCurrentTab();
+            }
+            resolve({ selectedPane });
+          },
+          { once: true }
+        );
+      },
+      { capture: true, once: true }
+    );
+  });
+}
+
+function openSiteDataSettingsDialog() {
+  let doc = gBrowser.selectedBrowser.contentDocument;
+  let settingsBtn = doc.getElementById("siteDataSettings");
+  let dialogOverlay = content.gSubDialog._preloadDialog._overlay;
+  let dialogLoadPromise = promiseLoadSubDialog(
+    "chrome://browser/content/preferences/dialogs/siteDataSettings.xhtml"
+  );
+  let dialogInitPromise = TestUtils.topicObserved(
+    "sitedata-settings-init",
+    () => true
+  );
+  let fullyLoadPromise = Promise.all([
+    dialogLoadPromise,
+    dialogInitPromise,
+  ]).then(() => {
+    is_element_visible(dialogOverlay, "The Settings dialog should be visible");
+  });
+  settingsBtn.doCommand();
+  return fullyLoadPromise;
+}
+
+function promiseSettingsDialogClose() {
+  return new Promise(resolve => {
+    let win = gBrowser.selectedBrowser.contentWindow;
+    let dialogOverlay = win.gSubDialog._topDialog._overlay;
+    let dialogWin = win.gSubDialog._topDialog._frame.contentWindow;
+    dialogWin.addEventListener(
+      "unload",
+      function unload() {
+        if (
+          dialogWin.document.documentURI ===
+          "chrome://browser/content/preferences/dialogs/siteDataSettings.xhtml"
+        ) {
+          is_element_hidden(
+            dialogOverlay,
+            "The Settings dialog should be hidden"
+          );
+          resolve();
+        }
+      },
+      { once: true }
+    );
+  });
+}
+
+function assertSitesListed(doc, hosts) {
+  let frameDoc = content.gSubDialog._topDialog._frame.contentDocument;
+  let removeAllBtn = frameDoc.getElementById("removeAll");
+  let sitesList = frameDoc.getElementById("sitesList");
+  let totalSitesNumber = sitesList.getElementsByTagName("richlistitem").length;
+  is(totalSitesNumber, hosts.length, "Should list the right sites number");
+  hosts.forEach(host => {
+    let site = sitesList.querySelector(`richlistitem[host="${host}"]`);
+    ok(site, `Should list the site of ${host}`);
+  });
+  is(removeAllBtn.disabled, false, "Should enable the removeAllBtn button");
+}
+
+// Counter used by addTestData to generate unique cookie names across function
+// calls.
+let cookieID = 0;
+
+async function addTestData(data) {
+  let hosts = new Set();
+
+  for (let site of data) {
+    is(
+      typeof site.origin,
+      "string",
+      "Passed an origin string into addTestData."
+    );
+    if (site.persisted) {
+      await SiteDataTestUtils.persist(site.origin);
+    }
+
+    if (site.usage) {
+      await SiteDataTestUtils.addToIndexedDB(site.origin, site.usage);
+    }
+
+    for (let i = 0; i < (site.cookies || 0); i++) {
+      SiteDataTestUtils.addToCookies({
+        origin: site.origin,
+        name: `cookie${cookieID++}`,
+      });
+    }
+
+    let principal =
+      Services.scriptSecurityManager.createContentPrincipalFromOrigin(
+        site.origin
+      );
+
+    hosts.add(principal.baseDomain || principal.host);
+  }
+
+  return Array.from(hosts);
+}
+
+function promiseCookiesCleared() {
+  return TestUtils.topicObserved("cookie-changed", subj => {
+    return (
+      subj.QueryInterface(Ci.nsICookieNotification).action ==
+      Ci.nsICookieNotification.ALL_COOKIES_CLEARED
+    );
+  });
+}
+
+async function loadServiceWorkerTestPage(url) {
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await TestUtils.waitForCondition(() => {
+    return SpecialPowers.spawn(
+      tab.linkedBrowser,
+      [],
+      () =>
+        content.document.body.getAttribute(
+          "data-test-service-worker-registered"
+        ) === "true"
+    );
+  }, `Fail to load service worker test ${url}`);
+  BrowserTestUtils.removeTab(tab);
+}
+
+function promiseServiceWorkersCleared() {
+  return TestUtils.waitForCondition(() => {
+    let serviceWorkers = serviceWorkerManager.getAllRegistrations();
+    if (!serviceWorkers.length) {
+      ok(true, "Cleared all service workers");
+      return true;
+    }
+    return false;
+  }, "Should clear all service workers");
+}
+
+function promiseServiceWorkerRegisteredFor(url) {
+  return TestUtils.waitForCondition(() => {
+    try {
+      let principal =
+        Services.scriptSecurityManager.createContentPrincipalFromOrigin(url);
+      let sw = serviceWorkerManager.getRegistrationByPrincipal(
+        principal,
+        principal.spec
+      );
+      if (sw) {
+        ok(true, `Found the service worker registered for ${url}`);
+        return true;
+      }
+    } catch (e) {}
+    return false;
+  }, `Should register service worker for ${url}`);
+}
diff --git a/browser/components/preferences/tests/siteData/offline/manifest.appcache b/browser/components/preferences/tests/siteData/offline/manifest.appcache
new file mode 100644
index 0000000000..a9287c64e6
--- /dev/null
+++ b/browser/components/preferences/tests/siteData/offline/manifest.appcache
@@ -0,0 +1,3 @@
+CACHE MANIFEST
+# V1
+offline.html
diff --git a/browser/components/preferences/tests/siteData/offline/offline.html b/browser/components/preferences/tests/siteData/offline/offline.html
new file mode 100644
index 0000000000..f76b8a2bce
--- /dev/null
+++ b/browser/components/preferences/tests/siteData/offline/offline.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html manifest="manifest.appcache">>
+  <head>
+    <meta charset="utf-8">
+    <meta http-equiv="Cache-Control" content="public" />
+    <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1, maximum-scale=1">
+
+  </head>
+
+  <body>
+    <h1>Set up offline appcache Test</h1>
+  </body>
+</html>
diff --git a/browser/components/preferences/tests/siteData/service_worker_test.html b/browser/components/preferences/tests/siteData/service_worker_test.html
new file mode 100644
index 0000000000..56f5173481
--- /dev/null
+++ b/browser/components/preferences/tests/siteData/service_worker_test.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <meta http-equiv="Cache-Control" content="public" />
+    <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1, maximum-scale=1">
+
+    <title>Service Worker Test</title>
+
+  </head>
+
+  <body>
+    <h1>Service Worker Test</h1>
+    <script type="text/javascript">
+      navigator.serviceWorker.register("service_worker_test.js")
+               .then(regis => document.body.setAttribute("data-test-service-worker-registered", "true"));
+    </script>
+  </body>
+</html>
diff --git a/browser/components/preferences/tests/siteData/service_worker_test.js b/browser/components/preferences/tests/siteData/service_worker_test.js
new file mode 100644
index 0000000000..2aba167d18
--- /dev/null
+++ b/browser/components/preferences/tests/siteData/service_worker_test.js
@@ -0,0 +1 @@
+// empty worker, always succeed!
diff --git a/browser/components/preferences/tests/siteData/site_data_test.html b/browser/components/preferences/tests/siteData/site_data_test.html
new file mode 100644
index 0000000000..758106b0a5
--- /dev/null
+++ b/browser/components/preferences/tests/siteData/site_data_test.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <meta http-equiv="Cache-Control" content="public" />
+    <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1, maximum-scale=1">
+
+    <title>Site Data Test</title>
+
+  </head>
+
+  <body>
+    <h1>Site Data Test</h1>
+    <script type="text/javascript">
+      let request = indexedDB.open("TestDatabase", 1);
+      request.onupgradeneeded = function(e) {
+        let db = e.target.result;
+        db.createObjectStore("TestStore", { keyPath: "id" });
+      };
+      request.onsuccess = function(e) {
+        let db = e.target.result;
+        let tx = db.transaction("TestStore", "readwrite");
+        let store = tx.objectStore("TestStore");
+        tx.oncomplete = () => document.dispatchEvent(new CustomEvent("test-indexedDB-done", {bubbles: true, cancelable: false}));
+        store.put({ id: "test_id", description: "Site Data Test"});
+      };
+    </script>
+  </body>
+</html>
diff --git a/browser/components/preferences/tests/subdialog.xhtml b/browser/components/preferences/tests/subdialog.xhtml
new file mode 100644
index 0000000000..3d5402b4e5
--- /dev/null
+++ b/browser/components/preferences/tests/subdialog.xhtml
@@ -0,0 +1,31 @@
+<?xml version="1.0"?>
+
+<!-- Any copyright is dedicated to the Public Domain.
+   - http://creativecommons.org/publicdomain/zero/1.0/ -->
+
+<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        xmlns:html="http://www.w3.org/1999/xhtml"
+        title="Sample sub-dialog" style="width: 32em; height: 5em;"
+        onload="document.getElementById('textbox').focus();">
+<dialog id="subDialog">
+  <script>
+    document.addEventListener("dialogaccept", acceptSubdialog);
+    function acceptSubdialog() {
+      window.arguments[0].acceptCount++;
+    }
+  </script>
+
+  <linkset>
+    <html:link rel="stylesheet" href="chrome://global/skin/global.css" />
+  </linkset>
+
+  <description id="desc">A sample sub-dialog for testing</description>
+
+  <html:input id="textbox" value="Default text" />
+
+  <separator class="thin"/>
+
+  <button oncommand="window.close();" label="Close" />
+
+</dialog>
+</window>
diff --git a/browser/components/preferences/tests/subdialog2.xhtml b/browser/components/preferences/tests/subdialog2.xhtml
new file mode 100644
index 0000000000..9ae04d5675
--- /dev/null
+++ b/browser/components/preferences/tests/subdialog2.xhtml
@@ -0,0 +1,29 @@
+<?xml version="1.0"?>
+
+<!-- Any copyright is dedicated to the Public Domain.
+   - http://creativecommons.org/publicdomain/zero/1.0/ -->
+
+<?xml-stylesheet href="chrome://global/skin/global.css" type="text/css"?>
+
+<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        xmlns:html="http://www.w3.org/1999/xhtml"
+        title="Sample sub-dialog #2" style="width: 32em; height: 5em;"
+        onload="document.getElementById('textbox').focus();">
+<dialog id="subDialog">
+  <script>
+    document.addEventListener("dialogaccept", acceptSubdialog);
+    function acceptSubdialog() {
+      window.arguments[0].acceptCount++;
+    }
+  </script>
+
+  <description id="desc">A sample sub-dialog for testing</description>
+
+  <html:input id="textbox" value="Default text" />
+
+  <separator class="thin"/>
+
+  <button oncommand="window.close();" label="Close" />
+
+</dialog>
+</window>