Adding upstream version 110.0.1.upstream/110.0.1upstream

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

1 files changed, 758 insertions, 0 deletions

diff --git a/browser/components/newtab/lib/ActivityStream.jsm b/browser/components/newtab/lib/ActivityStream.jsm
new file mode 100644
index 0000000000..bb9960a639
--- /dev/null
+++ b/browser/components/newtab/lib/ActivityStream.jsm
@@ -0,0 +1,758 @@
+/* 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/. */
+"use strict";
+
+const { AppConstants } = ChromeUtils.importESModule(
+  "resource://gre/modules/AppConstants.sys.mjs"
+);
+
+const lazy = {};
+
+ChromeUtils.defineModuleGetter(
+  lazy,
+  "DEFAULT_SITES",
+  "resource://activity-stream/lib/DefaultSites.jsm"
+);
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  Region: "resource://gre/modules/Region.sys.mjs",
+});
+
+// NB: Eagerly load modules that will be loaded/constructed/initialized in the
+// common case to avoid the overhead of wrapping and detecting lazy loading.
+const { actionCreators: ac, actionTypes: at } = ChromeUtils.importESModule(
+  "resource://activity-stream/common/Actions.sys.mjs"
+);
+ChromeUtils.defineModuleGetter(
+  lazy,
+  "AboutPreferences",
+  "resource://activity-stream/lib/AboutPreferences.jsm"
+);
+ChromeUtils.defineModuleGetter(
+  lazy,
+  "DefaultPrefs",
+  "resource://activity-stream/lib/ActivityStreamPrefs.jsm"
+);
+ChromeUtils.defineModuleGetter(
+  lazy,
+  "NewTabInit",
+  "resource://activity-stream/lib/NewTabInit.jsm"
+);
+ChromeUtils.defineModuleGetter(
+  lazy,
+  "SectionsFeed",
+  "resource://activity-stream/lib/SectionsManager.jsm"
+);
+ChromeUtils.defineModuleGetter(
+  lazy,
+  "RecommendationProvider",
+  "resource://activity-stream/lib/RecommendationProvider.jsm"
+);
+ChromeUtils.defineModuleGetter(
+  lazy,
+  "PlacesFeed",
+  "resource://activity-stream/lib/PlacesFeed.jsm"
+);
+ChromeUtils.defineModuleGetter(
+  lazy,
+  "PrefsFeed",
+  "resource://activity-stream/lib/PrefsFeed.jsm"
+);
+ChromeUtils.defineModuleGetter(
+  lazy,
+  "Store",
+  "resource://activity-stream/lib/Store.jsm"
+);
+ChromeUtils.defineModuleGetter(
+  lazy,
+  "SystemTickFeed",
+  "resource://activity-stream/lib/SystemTickFeed.jsm"
+);
+ChromeUtils.defineModuleGetter(
+  lazy,
+  "TelemetryFeed",
+  "resource://activity-stream/lib/TelemetryFeed.jsm"
+);
+ChromeUtils.defineModuleGetter(
+  lazy,
+  "FaviconFeed",
+  "resource://activity-stream/lib/FaviconFeed.jsm"
+);
+ChromeUtils.defineModuleGetter(
+  lazy,
+  "TopSitesFeed",
+  "resource://activity-stream/lib/TopSitesFeed.jsm"
+);
+ChromeUtils.defineModuleGetter(
+  lazy,
+  "TopStoriesFeed",
+  "resource://activity-stream/lib/TopStoriesFeed.jsm"
+);
+ChromeUtils.defineModuleGetter(
+  lazy,
+  "HighlightsFeed",
+  "resource://activity-stream/lib/HighlightsFeed.jsm"
+);
+ChromeUtils.defineModuleGetter(
+  lazy,
+  "DiscoveryStreamFeed",
+  "resource://activity-stream/lib/DiscoveryStreamFeed.jsm"
+);
+
+const REGION_STORIES_CONFIG =
+  "browser.newtabpage.activity-stream.discoverystream.region-stories-config";
+const REGION_STORIES_BLOCK =
+  "browser.newtabpage.activity-stream.discoverystream.region-stories-block";
+const REGION_SPOCS_CONFIG =
+  "browser.newtabpage.activity-stream.discoverystream.region-spocs-config";
+const REGION_BASIC_CONFIG =
+  "browser.newtabpage.activity-stream.discoverystream.region-basic-config";
+const LOCALE_LIST_CONFIG =
+  "browser.newtabpage.activity-stream.discoverystream.locale-list-config";
+
+// Determine if spocs should be shown for a geo/locale
+function showSpocs({ geo }) {
+  const spocsGeoString =
+    Services.prefs.getStringPref(REGION_SPOCS_CONFIG) || "";
+  const spocsGeo = spocsGeoString.split(",").map(s => s.trim());
+  return spocsGeo.includes(geo);
+}
+
+// Configure default Activity Stream prefs with a plain `value` or a `getValue`
+// that computes a value. A `value_local_dev` is used for development defaults.
+const PREFS_CONFIG = new Map([
+  [
+    "default.sites",
+    {
+      title:
+        "Comma-separated list of default top sites to fill in behind visited sites",
+      getValue: ({ geo }) =>
+        lazy.DEFAULT_SITES.get(lazy.DEFAULT_SITES.has(geo) ? geo : ""),
+    },
+  ],
+  [
+    "feeds.section.topstories.options",
+    {
+      title: "Configuration options for top stories feed",
+      // This is a dynamic pref as it depends on the feed being shown or not
+      getValue: args =>
+        JSON.stringify({
+          api_key_pref: "extensions.pocket.oAuthConsumerKey",
+          // Use the opposite value as what default value the feed would have used
+          hidden: !PREFS_CONFIG.get("feeds.system.topstories").getValue(args),
+          provider_icon: "chrome://global/skin/icons/pocket.svg",
+          provider_name: "Pocket",
+          read_more_endpoint:
+            "https://getpocket.com/explore/trending?src=fx_new_tab",
+          stories_endpoint: `https://getpocket.cdn.mozilla.net/v3/firefox/global-recs?version=3&consumer_key=$apiKey&locale_lang=${
+            args.locale
+          }&feed_variant=${
+            showSpocs(args) ? "default_spocs_on" : "default_spocs_off"
+          }`,
+          stories_referrer: "https://getpocket.com/recommendations",
+          topics_endpoint: `https://getpocket.cdn.mozilla.net/v3/firefox/trending-topics?version=2&consumer_key=$apiKey&locale_lang=${args.locale}`,
+          show_spocs: showSpocs(args),
+        }),
+    },
+  ],
+  [
+    "feeds.topsites",
+    {
+      title: "Displays Top Sites on the New Tab Page",
+      value: true,
+    },
+  ],
+  [
+    "hideTopSitesTitle",
+    {
+      title:
+        "Hide the top sites section's title, including the section and collapse icons",
+      value: false,
+    },
+  ],
+  [
+    "showSponsored",
+    {
+      title:
+        "Show sponsored cards in spoc experiment (show_spocs in topstories.options has to be set to true as well)",
+      value: true,
+    },
+  ],
+  [
+    "showSponsoredTopSites",
+    {
+      title: "Show sponsored top sites",
+      value: true,
+    },
+  ],
+  [
+    "pocketCta",
+    {
+      title: "Pocket cta and button for logged out users.",
+      value: JSON.stringify({
+        cta_button: "",
+        cta_text: "",
+        cta_url: "",
+        use_cta: false,
+      }),
+    },
+  ],
+  [
+    "showSearch",
+    {
+      title: "Show the Search bar",
+      value: true,
+    },
+  ],
+  [
+    "feeds.snippets",
+    {
+      title: "Show snippets on activity stream",
+      value: false,
+    },
+  ],
+  [
+    "topSitesRows",
+    {
+      title: "Number of rows of Top Sites to display",
+      value: 1,
+    },
+  ],
+  [
+    "telemetry",
+    {
+      title: "Enable system error and usage data collection",
+      value: true,
+      value_local_dev: false,
+    },
+  ],
+  [
+    "telemetry.ut.events",
+    {
+      title: "Enable Unified Telemetry event data collection",
+      value: AppConstants.EARLY_BETA_OR_EARLIER,
+      value_local_dev: false,
+    },
+  ],
+  [
+    "telemetry.structuredIngestion.endpoint",
+    {
+      title: "Structured Ingestion telemetry server endpoint",
+      value: "https://incoming.telemetry.mozilla.org/submit",
+    },
+  ],
+  [
+    "section.highlights.includeVisited",
+    {
+      title:
+        "Boolean flag that decides whether or not to show visited pages in highlights.",
+      value: true,
+    },
+  ],
+  [
+    "section.highlights.includeBookmarks",
+    {
+      title:
+        "Boolean flag that decides whether or not to show bookmarks in highlights.",
+      value: true,
+    },
+  ],
+  [
+    "section.highlights.includePocket",
+    {
+      title:
+        "Boolean flag that decides whether or not to show saved Pocket stories in highlights.",
+      value: true,
+    },
+  ],
+  [
+    "section.highlights.includeDownloads",
+    {
+      title:
+        "Boolean flag that decides whether or not to show saved recent Downloads in highlights.",
+      value: true,
+    },
+  ],
+  [
+    "section.highlights.rows",
+    {
+      title: "Number of rows of Highlights to display",
+      value: 1,
+    },
+  ],
+  [
+    "section.topstories.rows",
+    {
+      title: "Number of rows of Top Stories to display",
+      value: 1,
+    },
+  ],
+  [
+    "sectionOrder",
+    {
+      title: "The rendering order for the sections",
+      value: "topsites,topstories,highlights",
+    },
+  ],
+  [
+    "improvesearch.noDefaultSearchTile",
+    {
+      title: "Remove tiles that are the same as the default search",
+      value: true,
+    },
+  ],
+  [
+    "improvesearch.topSiteSearchShortcuts.searchEngines",
+    {
+      title:
+        "An ordered, comma-delimited list of search shortcuts that we should try and pin",
+      // This pref is dynamic as the shortcuts vary depending on the region
+      getValue: ({ geo }) => {
+        if (!geo) {
+          return "";
+        }
+        const searchShortcuts = [];
+        if (geo === "CN") {
+          searchShortcuts.push("baidu");
+        } else if (["BY", "KZ", "RU", "TR"].includes(geo)) {
+          searchShortcuts.push("yandex");
+        } else {
+          searchShortcuts.push("google");
+        }
+        if (["DE", "FR", "GB", "IT", "JP", "US"].includes(geo)) {
+          searchShortcuts.push("amazon");
+        }
+        return searchShortcuts.join(",");
+      },
+    },
+  ],
+  [
+    "improvesearch.topSiteSearchShortcuts.havePinned",
+    {
+      title:
+        "A comma-delimited list of search shortcuts that have previously been pinned",
+      value: "",
+    },
+  ],
+  [
+    "asrouter.devtoolsEnabled",
+    {
+      title: "Are the asrouter devtools enabled?",
+      value: false,
+    },
+  ],
+  [
+    "asrouter.providers.onboarding",
+    {
+      title: "Configuration for onboarding provider",
+      value: JSON.stringify({
+        id: "onboarding",
+        type: "local",
+        localProvider: "OnboardingMessageProvider",
+        enabled: true,
+        // Block specific messages from this local provider
+        exclude: [],
+      }),
+    },
+  ],
+  // See browser/app/profile/firefox.js for other ASR preferences. They must be defined there to enable roll-outs.
+  [
+    "discoverystream.flight.blocks",
+    {
+      title: "Track flight blocks",
+      skipBroadcast: true,
+      value: "{}",
+    },
+  ],
+  [
+    "discoverystream.config",
+    {
+      title: "Configuration for the new pocket new tab",
+      getValue: ({ geo, locale }) => {
+        return JSON.stringify({
+          api_key_pref: "extensions.pocket.oAuthConsumerKey",
+          collapsible: true,
+          enabled: true,
+          show_spocs: showSpocs({ geo }),
+          hardcoded_layout: true,
+          // This is currently an exmple layout used for dev purposes.
+          layout_endpoint:
+            "https://getpocket.cdn.mozilla.net/v3/newtab/layout?version=1&consumer_key=$apiKey&layout_variant=basic",
+        });
+      },
+    },
+  ],
+  [
+    "discoverystream.endpoints",
+    {
+      title:
+        "Endpoint prefixes (comma-separated) that are allowed to be requested",
+      value: "https://getpocket.cdn.mozilla.net/,https://spocs.getpocket.com/",
+    },
+  ],
+  [
+    "discoverystream.isCollectionDismissible",
+    {
+      title: "Allows Pocket story collections to be dismissed",
+      value: false,
+    },
+  ],
+  [
+    "discoverystream.region-basic-layout",
+    {
+      title: "Decision to use basic layout based on region.",
+      getValue: ({ geo }) => {
+        const preffedRegionsString =
+          Services.prefs.getStringPref(REGION_BASIC_CONFIG) || "";
+        // If no regions are set to basic,
+        // we don't need to bother checking against the region.
+        // We are also not concerned if geo is not set,
+        // because stories are going to be empty until we have geo.
+        if (!preffedRegionsString) {
+          return false;
+        }
+        const preffedRegions = preffedRegionsString
+          .split(",")
+          .map(s => s.trim());
+
+        return preffedRegions.includes(geo);
+      },
+    },
+  ],
+  [
+    "discoverystream.spoc.impressions",
+    {
+      title: "Track spoc impressions",
+      skipBroadcast: true,
+      value: "{}",
+    },
+  ],
+  [
+    "discoverystream.endpointSpocsClear",
+    {
+      title:
+        "Endpoint for when a user opts-out of sponsored content to delete the user's data from the ad server.",
+      value: "https://spocs.getpocket.com/user",
+    },
+  ],
+  [
+    "discoverystream.rec.impressions",
+    {
+      title: "Track rec impressions",
+      skipBroadcast: true,
+      value: "{}",
+    },
+  ],
+  [
+    "showRecentSaves",
+    {
+      title: "Control whether a user wants recent saves visible on Newtab",
+      value: true,
+    },
+  ],
+]);
+
+// Array of each feed's FEEDS_CONFIG factory and values to add to PREFS_CONFIG
+const FEEDS_DATA = [
+  {
+    name: "aboutpreferences",
+    factory: () => new lazy.AboutPreferences(),
+    title: "about:preferences rendering",
+    value: true,
+  },
+  {
+    name: "newtabinit",
+    factory: () => new lazy.NewTabInit(),
+    title: "Sends a copy of the state to each new tab that is opened",
+    value: true,
+  },
+  {
+    name: "places",
+    factory: () => new lazy.PlacesFeed(),
+    title: "Listens for and relays various Places-related events",
+    value: true,
+  },
+  {
+    name: "prefs",
+    factory: () => new lazy.PrefsFeed(PREFS_CONFIG),
+    title: "Preferences",
+    value: true,
+  },
+  {
+    name: "sections",
+    factory: () => new lazy.SectionsFeed(),
+    title: "Manages sections",
+    value: true,
+  },
+  {
+    name: "section.highlights",
+    factory: () => new lazy.HighlightsFeed(),
+    title: "Fetches content recommendations from places db",
+    value: false,
+  },
+  {
+    name: "system.topstories",
+    factory: () =>
+      new lazy.TopStoriesFeed(PREFS_CONFIG.get("discoverystream.config")),
+    title:
+      "System pref that fetches content recommendations from a configurable content provider",
+    // Dynamically determine if Pocket should be shown for a geo / locale
+    getValue: ({ geo, locale }) => {
+      // If we don't have geo, we don't want to flash the screen with stories while geo loads.
+      // Best to display nothing until geo is ready.
+      if (!geo) {
+        return false;
+      }
+      const preffedRegionsBlockString =
+        Services.prefs.getStringPref(REGION_STORIES_BLOCK) || "";
+      const preffedRegionsString =
+        Services.prefs.getStringPref(REGION_STORIES_CONFIG) || "";
+      const preffedLocaleListString =
+        Services.prefs.getStringPref(LOCALE_LIST_CONFIG) || "";
+      const preffedBlockRegions = preffedRegionsBlockString
+        .split(",")
+        .map(s => s.trim());
+      const preffedRegions = preffedRegionsString.split(",").map(s => s.trim());
+      const preffedLocales = preffedLocaleListString
+        .split(",")
+        .map(s => s.trim());
+      const locales = {
+        US: ["en-CA", "en-GB", "en-US"],
+        CA: ["en-CA", "en-GB", "en-US"],
+        GB: ["en-CA", "en-GB", "en-US"],
+        AU: ["en-CA", "en-GB", "en-US"],
+        NZ: ["en-CA", "en-GB", "en-US"],
+        IN: ["en-CA", "en-GB", "en-US"],
+        IE: ["en-CA", "en-GB", "en-US"],
+        ZA: ["en-CA", "en-GB", "en-US"],
+        CH: ["de"],
+        BE: ["de"],
+        DE: ["de"],
+        AT: ["de"],
+        IT: ["it"],
+        FR: ["fr"],
+        ES: ["es"],
+        PL: ["pl"],
+        JP: ["ja", "ja-JP-mac"],
+      }[geo];
+
+      const regionBlocked = preffedBlockRegions.includes(geo);
+      const localeEnabled = locale && preffedLocales.includes(locale);
+      const regionEnabled =
+        preffedRegions.includes(geo) && !!locales && locales.includes(locale);
+      return !regionBlocked && (localeEnabled || regionEnabled);
+    },
+  },
+  {
+    name: "systemtick",
+    factory: () => new lazy.SystemTickFeed(),
+    title: "Produces system tick events to periodically check for data expiry",
+    value: true,
+  },
+  {
+    name: "telemetry",
+    factory: () => new lazy.TelemetryFeed(),
+    title: "Relays telemetry-related actions to PingCentre",
+    value: true,
+  },
+  {
+    name: "favicon",
+    factory: () => new lazy.FaviconFeed(),
+    title: "Fetches tippy top manifests from remote service",
+    value: true,
+  },
+  {
+    name: "system.topsites",
+    factory: () => new lazy.TopSitesFeed(),
+    title: "Queries places and gets metadata for Top Sites section",
+    value: true,
+  },
+  {
+    name: "recommendationprovider",
+    factory: () => new lazy.RecommendationProvider(),
+    title: "Handles setup and interaction for the personality provider",
+    value: true,
+  },
+  {
+    name: "discoverystreamfeed",
+    factory: () => new lazy.DiscoveryStreamFeed(),
+    title: "Handles new pocket ui for the new tab page",
+    value: true,
+  },
+];
+
+const FEEDS_CONFIG = new Map();
+for (const config of FEEDS_DATA) {
+  const pref = `feeds.${config.name}`;
+  FEEDS_CONFIG.set(pref, config.factory);
+  PREFS_CONFIG.set(pref, config);
+}
+
+class ActivityStream {
+  /**
+   * constructor - Initializes an instance of ActivityStream
+   */
+  constructor() {
+    this.initialized = false;
+    this.store = new lazy.Store();
+    this.feeds = FEEDS_CONFIG;
+    this._defaultPrefs = new lazy.DefaultPrefs(PREFS_CONFIG);
+  }
+
+  init() {
+    try {
+      this._updateDynamicPrefs();
+      this._defaultPrefs.init();
+      Services.obs.addObserver(this, "intl:app-locales-changed");
+
+      // Look for outdated user pref values that might have been accidentally
+      // persisted when restoring the original pref value at the end of an
+      // experiment across versions with a different default value.
+      const DS_CONFIG =
+        "browser.newtabpage.activity-stream.discoverystream.config";
+      if (
+        Services.prefs.prefHasUserValue(DS_CONFIG) &&
+        [
+          // Firefox 66
+          `{"api_key_pref":"extensions.pocket.oAuthConsumerKey","enabled":false,"show_spocs":true,"layout_endpoint":"https://getpocket.com/v3/newtab/layout?version=1&consumer_key=$apiKey&layout_variant=basic"}`,
+          // Firefox 67
+          `{"api_key_pref":"extensions.pocket.oAuthConsumerKey","enabled":false,"show_spocs":true,"layout_endpoint":"https://getpocket.cdn.mozilla.net/v3/newtab/layout?version=1&consumer_key=$apiKey&layout_variant=basic"}`,
+          // Firefox 68
+          `{"api_key_pref":"extensions.pocket.oAuthConsumerKey","collapsible":true,"enabled":false,"show_spocs":true,"hardcoded_layout":true,"personalized":false,"layout_endpoint":"https://getpocket.cdn.mozilla.net/v3/newtab/layout?version=1&consumer_key=$apiKey&layout_variant=basic"}`,
+        ].includes(Services.prefs.getStringPref(DS_CONFIG))
+      ) {
+        Services.prefs.clearUserPref(DS_CONFIG);
+      }
+
+      // Hook up the store and let all feeds and pages initialize
+      this.store.init(
+        this.feeds,
+        ac.BroadcastToContent({
+          type: at.INIT,
+          data: {
+            locale: this.locale,
+          },
+          meta: {
+            isStartup: true,
+          },
+        }),
+        { type: at.UNINIT }
+      );
+
+      this.initialized = true;
+    } catch (e) {
+      // TelemetryFeed could be unavailable if the telemetry is disabled, or
+      // the telemetry feed is not yet initialized.
+      const telemetryFeed = this.store.feeds.get("feeds.telemetry");
+      if (telemetryFeed) {
+        telemetryFeed.handleUndesiredEvent({
+          data: { event: "ADDON_INIT_FAILED" },
+        });
+      }
+      throw e;
+    }
+  }
+
+  /**
+   * Check if an old pref has a custom value to migrate. Clears the pref so that
+   * it's the default after migrating (to avoid future need to migrate).
+   *
+   * @param oldPrefName {string} Pref to check and migrate
+   * @param cbIfNotDefault {function} Callback that gets the current pref value
+   */
+  _migratePref(oldPrefName, cbIfNotDefault) {
+    // Nothing to do if the user doesn't have a custom value
+    if (!Services.prefs.prefHasUserValue(oldPrefName)) {
+      return;
+    }
+
+    // Figure out what kind of pref getter to use
+    let prefGetter;
+    switch (Services.prefs.getPrefType(oldPrefName)) {
+      case Services.prefs.PREF_BOOL:
+        prefGetter = "getBoolPref";
+        break;
+      case Services.prefs.PREF_INT:
+        prefGetter = "getIntPref";
+        break;
+      case Services.prefs.PREF_STRING:
+        prefGetter = "getStringPref";
+        break;
+    }
+
+    // Give the callback the current value then clear the pref
+    cbIfNotDefault(Services.prefs[prefGetter](oldPrefName));
+    Services.prefs.clearUserPref(oldPrefName);
+  }
+
+  uninit() {
+    if (this.geo === "") {
+      Services.obs.removeObserver(this, lazy.Region.REGION_TOPIC);
+    }
+
+    Services.obs.removeObserver(this, "intl:app-locales-changed");
+
+    this.store.uninit();
+    this.initialized = false;
+  }
+
+  _updateDynamicPrefs() {
+    // Save the geo pref if we have it
+    if (lazy.Region.home) {
+      this.geo = lazy.Region.home;
+    } else if (this.geo !== "") {
+      // Watch for geo changes and use a dummy value for now
+      Services.obs.addObserver(this, lazy.Region.REGION_TOPIC);
+      this.geo = "";
+    }
+
+    this.locale = Services.locale.appLocaleAsBCP47;
+
+    // Update the pref config of those with dynamic values
+    for (const pref of PREFS_CONFIG.keys()) {
+      // Only need to process dynamic prefs
+      const prefConfig = PREFS_CONFIG.get(pref);
+      if (!prefConfig.getValue) {
+        continue;
+      }
+
+      // Have the dynamic pref just reuse using existing default, e.g., those
+      // set via Autoconfig or policy
+      try {
+        const existingDefault = this._defaultPrefs.get(pref);
+        if (existingDefault !== undefined && prefConfig.value === undefined) {
+          prefConfig.getValue = () => existingDefault;
+        }
+      } catch (ex) {
+        // We get NS_ERROR_UNEXPECTED for prefs that have a user value (causing
+        // default branch to believe there's a type) but no actual default value
+      }
+
+      // Compute the dynamic value (potentially generic based on dummy geo)
+      const newValue = prefConfig.getValue({
+        geo: this.geo,
+        locale: this.locale,
+      });
+
+      // If there's an existing value and it has changed, that means we need to
+      // overwrite the default with the new value.
+      if (prefConfig.value !== undefined && prefConfig.value !== newValue) {
+        this._defaultPrefs.set(pref, newValue);
+      }
+
+      prefConfig.value = newValue;
+    }
+  }
+
+  observe(subject, topic, data) {
+    switch (topic) {
+      case "intl:app-locales-changed":
+      case lazy.Region.REGION_TOPIC:
+        this._updateDynamicPrefs();
+        break;
+    }
+  }
+}
+
+const EXPORTED_SYMBOLS = ["ActivityStream", "PREFS_CONFIG"];