Add Basilisk

12 files changed, 1484 insertions, 0 deletions

diff --git a/application/basilisk/components/newtab/NewTabComponents.manifest b/application/basilisk/components/newtab/NewTabComponents.manifest
new file mode 100644
index 000000000..42db65acd
--- /dev/null
+++ b/application/basilisk/components/newtab/NewTabComponents.manifest
@@ -0,0 +1,2 @@
+component {dfcd2adc-7867-4d3a-ba70-17501f208142} aboutNewTabService.js
+contract @mozilla.org/browser/aboutnewtab-service;1 {dfcd2adc-7867-4d3a-ba70-17501f208142}
diff --git a/application/basilisk/components/newtab/NewTabMessages.jsm b/application/basilisk/components/newtab/NewTabMessages.jsm
new file mode 100644
index 000000000..0816ed65a
--- /dev/null
+++ b/application/basilisk/components/newtab/NewTabMessages.jsm
@@ -0,0 +1,242 @@
+/* global
+  NewTabWebChannel,
+  NewTabPrefsProvider,
+  PlacesProvider,
+  PreviewProvider,
+  NewTabSearchProvider,
+  Preferences,
+  XPCOMUtils,
+  Task
+*/
+
+/* exported NewTabMessages */
+
+"use strict";
+
+const {utils: Cu} = Components;
+Cu.import("resource://gre/modules/Preferences.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Task.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "PlacesProvider",
+                                  "resource:///modules/PlacesProvider.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "PreviewProvider",
+                                  "resource:///modules/PreviewProvider.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "NewTabPrefsProvider",
+                                  "resource:///modules/NewTabPrefsProvider.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "NewTabSearchProvider",
+                                  "resource:///modules/NewTabSearchProvider.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "NewTabWebChannel",
+                                  "resource:///modules/NewTabWebChannel.jsm");
+
+this.EXPORTED_SYMBOLS = ["NewTabMessages"];
+
+const PREF_ENABLED = "browser.newtabpage.remote";
+const CURRENT_ENGINE = "browser-search-engine-modified";
+
+// Action names are from the content's perspective. in from chrome == out from content
+// Maybe replace the ACTION objects by a bi-directional Map a bit later?
+const ACTIONS = {
+  inboundActions: [
+    "REQUEST_PREFS",
+    "REQUEST_THUMB",
+    "REQUEST_FRECENT",
+    "REQUEST_UISTRINGS",
+    "REQUEST_SEARCH_SUGGESTIONS",
+    "REQUEST_MANAGE_ENGINES",
+    "REQUEST_SEARCH_STATE",
+    "REQUEST_REMOVE_FORM_HISTORY",
+    "REQUEST_PERFORM_SEARCH",
+    "REQUEST_CYCLE_ENGINE",
+  ],
+  prefs: {
+    inPrefs: "REQUEST_PREFS",
+    outPrefs: "RECEIVE_PREFS",
+  },
+  preview: {
+    inThumb: "REQUEST_THUMB",
+    outThumb: "RECEIVE_THUMB",
+  },
+  links: {
+    inFrecent: "REQUEST_FRECENT",
+    outFrecent: "RECEIVE_FRECENT",
+    outPlacesChange: "RECEIVE_PLACES_CHANGE",
+  },
+  search: {
+    inSearch: {
+        UIStrings: "REQUEST_UISTRINGS",
+        suggestions: "REQUEST_SEARCH_SUGGESTIONS",
+        manageEngines: "REQUEST_MANAGE_ENGINES",
+        state: "REQUEST_SEARCH_STATE",
+        removeFormHistory: "REQUEST_REMOVE_FORM_HISTORY",
+        performSearch: "REQUEST_PERFORM_SEARCH",
+        cycleEngine: "REQUEST_CYCLE_ENGINE"
+    },
+    outSearch: {
+      UIStrings: "RECEIVE_UISTRINGS",
+      suggestions: "RECEIVE_SEARCH_SUGGESTIONS",
+      state: "RECEIVE_SEARCH_STATE",
+      currentEngine: "RECEIVE_CURRENT_ENGINE"
+    },
+  }
+};
+
+let NewTabMessages = {
+
+  _prefs: {},
+
+  /** NEWTAB EVENT HANDLERS **/
+
+  handleContentRequest(actionName, {data, target}) {
+    switch (actionName) {
+      case ACTIONS.prefs.inPrefs:
+        // Return to the originator all newtabpage prefs
+        let results = NewTabPrefsProvider.prefs.newtabPagePrefs;
+        NewTabWebChannel.send(ACTIONS.prefs.outPrefs, results, target);
+        break;
+      case ACTIONS.preview.inThumb:
+        // Return to the originator a preview URL
+        PreviewProvider.getThumbnail(data).then(imgData => {
+          NewTabWebChannel.send(ACTIONS.preview.outThumb, {url: data, imgData}, target);
+        });
+        break;
+      case ACTIONS.links.inFrecent:
+        // Return to the originator the top frecent links
+        PlacesProvider.links.getLinks().then(links => {
+          NewTabWebChannel.send(ACTIONS.links.outFrecent, links, target);
+        });
+        break;
+      case ACTIONS.search.inSearch.UIStrings:
+        // Return to the originator all search strings to display
+        let strings = NewTabSearchProvider.search.searchSuggestionUIStrings;
+        NewTabWebChannel.send(ACTIONS.search.outSearch.UIStrings, strings, target);
+        break;
+      case ACTIONS.search.inSearch.suggestions:
+        // Return to the originator all search suggestions
+        Task.spawn(function*() {
+          try {
+            let {engineName, searchString} = data;
+            let suggestions = yield NewTabSearchProvider.search.asyncGetSuggestions(engineName, searchString, target);
+            NewTabWebChannel.send(ACTIONS.search.outSearch.suggestions, suggestions, target);
+          } catch (e) {
+            Cu.reportError(e);
+          }
+        });
+        break;
+      case ACTIONS.search.inSearch.manageEngines:
+        // Open about:preferences to manage search state
+        NewTabSearchProvider.search.manageEngines(target.browser);
+        break;
+      case ACTIONS.search.inSearch.state:
+        // Return the state of the search component (i.e current engine and visible engine details)
+        Task.spawn(function*() {
+          try {
+            let state = yield NewTabSearchProvider.search.asyncGetState();
+            NewTabWebChannel.broadcast(ACTIONS.search.outSearch.state, state);
+          } catch (e) {
+            Cu.reportError(e);
+          }
+        });
+        break;
+      case ACTIONS.search.inSearch.removeFormHistory:
+        // Remove a form history entry from the search component
+        let suggestion = data;
+        NewTabSearchProvider.search.removeFormHistory(target, suggestion);
+        break;
+      case ACTIONS.search.inSearch.performSearch:
+        // Perform a search
+        NewTabSearchProvider.search.asyncPerformSearch(target, data).catch(Cu.reportError);
+        break;
+      case ACTIONS.search.inSearch.cycleEngine:
+        // Set the new current engine
+        NewTabSearchProvider.search.asyncCycleEngine(data).catch(Cu.reportError);
+        break;
+    }
+  },
+
+  /*
+   * Broadcast places change to all open newtab pages
+   */
+  handlePlacesChange(type, data) {
+    NewTabWebChannel.broadcast(ACTIONS.links.outPlacesChange, {type, data});
+  },
+
+  /*
+   * Broadcast current engine has changed to all open newtab pages
+   */
+  _handleCurrentEngineChange(name, value) { // jshint unused: false
+    let engine = value;
+    NewTabWebChannel.broadcast(ACTIONS.search.outSearch.currentEngine, engine);
+  },
+
+  /*
+   * Broadcast preference changes to all open newtab pages
+   */
+  handlePrefChange(actionName, value) {
+    let prefChange = {};
+    prefChange[actionName] = value;
+    NewTabWebChannel.broadcast(ACTIONS.prefs.outPrefs, prefChange);
+  },
+
+  _handleEnabledChange(prefName, value) {
+    if (prefName === PREF_ENABLED) {
+      if (this._prefs.enabled && !value) {
+        this.uninit();
+      } else if (!this._prefs.enabled && value) {
+        this.init();
+      }
+    }
+  },
+
+  init() {
+    this.handleContentRequest = this.handleContentRequest.bind(this);
+    this._handleEnabledChange = this._handleEnabledChange.bind(this);
+    this._handleCurrentEngineChange = this._handleCurrentEngineChange.bind(this);
+
+    PlacesProvider.links.init();
+    NewTabPrefsProvider.prefs.init();
+    NewTabSearchProvider.search.init();
+    NewTabWebChannel.init();
+
+    this._prefs.enabled = Preferences.get(PREF_ENABLED, false);
+
+    if (this._prefs.enabled) {
+      for (let action of ACTIONS.inboundActions) {
+        NewTabWebChannel.on(action, this.handleContentRequest);
+      }
+
+      NewTabPrefsProvider.prefs.on(PREF_ENABLED, this._handleEnabledChange);
+      NewTabSearchProvider.search.on(CURRENT_ENGINE, this._handleCurrentEngineChange);
+
+      for (let pref of NewTabPrefsProvider.newtabPagePrefSet) {
+        NewTabPrefsProvider.prefs.on(pref, this.handlePrefChange);
+      }
+
+      PlacesProvider.links.on("deleteURI", this.handlePlacesChange);
+      PlacesProvider.links.on("clearHistory", this.handlePlacesChange);
+      PlacesProvider.links.on("linkChanged", this.handlePlacesChange);
+      PlacesProvider.links.on("manyLinksChanged", this.handlePlacesChange);
+    }
+  },
+
+  uninit() {
+    this._prefs.enabled = Preferences.get(PREF_ENABLED, false);
+
+    if (this._prefs.enabled) {
+      NewTabPrefsProvider.prefs.off(PREF_ENABLED, this._handleEnabledChange);
+      NewTabSearchProvider.search.off(CURRENT_ENGINE, this._handleCurrentEngineChange);
+
+      for (let action of ACTIONS.inboundActions) {
+        NewTabWebChannel.off(action, this.handleContentRequest);
+      }
+
+      for (let pref of NewTabPrefsProvider.newtabPagePrefSet) {
+        NewTabPrefsProvider.prefs.off(pref, this.handlePrefChange);
+      }
+    }
+
+    NewTabPrefsProvider.prefs.uninit();
+    NewTabSearchProvider.search.uninit();
+    NewTabWebChannel.uninit();
+  }
+};
diff --git a/application/basilisk/components/newtab/NewTabPrefsProvider.jsm b/application/basilisk/components/newtab/NewTabPrefsProvider.jsm
new file mode 100644
index 000000000..9fad222c1
--- /dev/null
+++ b/application/basilisk/components/newtab/NewTabPrefsProvider.jsm
@@ -0,0 +1,114 @@
+/* global Services, Preferences, EventEmitter, XPCOMUtils */
+/* exported NewTabPrefsProvider */
+
+"use strict";
+
+this.EXPORTED_SYMBOLS = ["NewTabPrefsProvider"];
+
+const {interfaces: Ci, utils: Cu} = Components;
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/Preferences.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+XPCOMUtils.defineLazyGetter(this, "EventEmitter", function() {
+  const {EventEmitter} = Cu.import("resource://devtools/shared/event-emitter.js", {});
+  return EventEmitter;
+});
+
+// Supported prefs and data type
+const gPrefsMap = new Map([
+  ["browser.newtabpage.remote", "bool"],
+  ["browser.newtabpage.remote.mode", "str"],
+  ["browser.newtabpage.remote.version", "str"],
+  ["browser.newtabpage.enabled", "bool"],
+  ["browser.newtabpage.enhanced", "bool"],
+  ["browser.newtabpage.introShown", "bool"],
+  ["browser.newtabpage.updateIntroShown", "bool"],
+  ["browser.newtabpage.pinned", "str"],
+  ["browser.newtabpage.blocked", "str"],
+  ["intl.locale.matchOS", "bool"],
+  ["general.useragent.locale", "localized"],
+  ["browser.search.hiddenOneOffs", "str"],
+]);
+
+// prefs that are important for the newtab page
+const gNewtabPagePrefs = new Set([
+  "browser.newtabpage.enabled",
+  "browser.newtabpage.enhanced",
+  "browser.newtabpage.pinned",
+  "browser.newtabpage.blocked",
+  "browser.newtabpage.introShown",
+  "browser.newtabpage.updateIntroShown",
+  "browser.search.hiddenOneOffs",
+]);
+
+let PrefsProvider = function PrefsProvider() {
+  EventEmitter.decorate(this);
+};
+
+PrefsProvider.prototype = {
+
+  observe(subject, topic, data) { // jshint ignore:line
+    if (topic === "nsPref:changed") {
+      if (gPrefsMap.has(data)) {
+        switch (gPrefsMap.get(data)) {
+          case "bool":
+            this.emit(data, Preferences.get(data, false));
+            break;
+          case "str":
+            this.emit(data, Preferences.get(data, ""));
+            break;
+          case "localized":
+            try {
+              this.emit(data, Preferences.get(data, "", Ci.nsIPrefLocalizedString));
+            } catch (e) {
+              this.emit(data, Preferences.get(data, ""));
+            }
+            break;
+          default:
+            this.emit(data);
+            break;
+        }
+      }
+    } else {
+      Cu.reportError(new Error("NewTabPrefsProvider observing unknown topic"));
+    }
+  },
+
+  /*
+   * Return the preferences that are important to the newtab page
+   */
+  get newtabPagePrefs() {
+    let results = {};
+    for (let pref of gNewtabPagePrefs) {
+      results[pref] = Preferences.get(pref, null);
+    }
+    return results;
+  },
+
+  get prefsMap() {
+    return gPrefsMap;
+  },
+
+  init() {
+    for (let pref of gPrefsMap.keys()) {
+      Services.prefs.addObserver(pref, this, false);
+    }
+  },
+
+  uninit() {
+    for (let pref of gPrefsMap.keys()) {
+      Services.prefs.removeObserver(pref, this);
+    }
+  }
+};
+
+/**
+ * Singleton that serves as the default new tab pref provider for the grid.
+ */
+const gPrefs = new PrefsProvider();
+
+let NewTabPrefsProvider = {
+  prefs: gPrefs,
+  newtabPagePrefSet: gNewtabPagePrefs,
+};
diff --git a/application/basilisk/components/newtab/NewTabRemoteResources.jsm b/application/basilisk/components/newtab/NewTabRemoteResources.jsm
new file mode 100644
index 000000000..57351b15c
--- /dev/null
+++ b/application/basilisk/components/newtab/NewTabRemoteResources.jsm
@@ -0,0 +1,15 @@
+/* exported NewTabRemoteResources */
+
+"use strict";
+
+this.EXPORTED_SYMBOLS = ["NewTabRemoteResources"];
+
+const NewTabRemoteResources = {
+  MODE_CHANNEL_MAP: {
+    production: {origin: "https://content.cdn.mozilla.net"},
+    staging: {origin: "https://s3_proxy_tiles.stage.mozaws.net"},
+    test: {origin: "https://example.com"},
+    test2: {origin: "http://mochi.test:8888"},
+    dev: {origin: "http://localhost:8888"}
+  }
+};
diff --git a/application/basilisk/components/newtab/NewTabSearchProvider.jsm b/application/basilisk/components/newtab/NewTabSearchProvider.jsm
new file mode 100644
index 000000000..8e034878d
--- /dev/null
+++ b/application/basilisk/components/newtab/NewTabSearchProvider.jsm
@@ -0,0 +1,103 @@
+/* global XPCOMUtils, ContentSearch, Task, Services, EventEmitter */
+/* exported NewTabSearchProvider */
+
+"use strict";
+
+this.EXPORTED_SYMBOLS = ["NewTabSearchProvider"];
+
+const {utils: Cu, interfaces: Ci} = Components;
+const CURRENT_ENGINE = "browser-search-engine-modified";
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Task.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "ContentSearch",
+                                  "resource:///modules/ContentSearch.jsm");
+
+XPCOMUtils.defineLazyGetter(this, "EventEmitter", function() {
+  const {EventEmitter} = Cu.import("resource://devtools/shared/event-emitter.js", {});
+  return EventEmitter;
+});
+
+function SearchProvider() {
+  EventEmitter.decorate(this);
+}
+
+SearchProvider.prototype = {
+
+  observe(subject, topic, data) { // jshint unused:false
+    // all other topics are not relevant to content searches and can be
+    // ignored by NewTabSearchProvider
+    if (data === "engine-current" && topic === CURRENT_ENGINE) {
+      Task.spawn(function* () {
+        try {
+          let state = yield ContentSearch.currentStateObj(true);
+          let engine = state.currentEngine;
+          this.emit(CURRENT_ENGINE, engine);
+        } catch (e) {
+          Cu.reportError(e);
+        }
+      }.bind(this));
+    }
+  },
+
+  init() {
+    try {
+      Services.obs.addObserver(this, CURRENT_ENGINE, true);
+    } catch (e) {
+      Cu.reportError(e);
+    }
+  },
+
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver,
+    Ci.nsISupportsWeakReference
+  ]),
+
+  uninit() {
+    try {
+      Services.obs.removeObserver(this, CURRENT_ENGINE);
+    } catch (e) {
+      Cu.reportError(e);
+    }
+  },
+
+  get searchSuggestionUIStrings() {
+    return ContentSearch.searchSuggestionUIStrings;
+  },
+
+  removeFormHistory({browser}, suggestion) {
+    ContentSearch.removeFormHistoryEntry({target: browser}, suggestion);
+  },
+
+  manageEngines(browser) {
+    const browserWin = browser.ownerGlobal;
+    browserWin.openPreferences("paneSearch");
+  },
+
+  asyncGetState: Task.async(function*() {
+    let state = yield ContentSearch.currentStateObj(true);
+    return state;
+  }),
+
+  asyncPerformSearch: Task.async(function*({browser}, searchData) {
+    ContentSearch.performSearch({target: browser}, searchData);
+    yield ContentSearch.addFormHistoryEntry({target: browser}, searchData.searchString);
+  }),
+
+  asyncCycleEngine: Task.async(function*(engineName) {
+    Services.search.currentEngine = Services.search.getEngineByName(engineName);
+    let state = yield ContentSearch.currentStateObj(true);
+    let newEngine = state.currentEngine;
+    this.emit(CURRENT_ENGINE, newEngine);
+  }),
+
+  asyncGetSuggestions: Task.async(function*(engineName, searchString, target) {
+    let suggestions = ContentSearch.getSuggestions(engineName, searchString, target.browser);
+    return suggestions;
+  }),
+};
+
+const NewTabSearchProvider = {
+  search: new SearchProvider(),
+};
diff --git a/application/basilisk/components/newtab/NewTabURL.jsm b/application/basilisk/components/newtab/NewTabURL.jsm
new file mode 100644
index 000000000..9c8b78dd5
--- /dev/null
+++ b/application/basilisk/components/newtab/NewTabURL.jsm
@@ -0,0 +1,36 @@
+/* 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/. */
+
+/* globals XPCOMUtils, aboutNewTabService*/
+/* exported NewTabURL */
+
+"use strict";
+
+const {utils: Cu} = Components;
+
+this.EXPORTED_SYMBOLS = ["NewTabURL"];
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+XPCOMUtils.defineLazyServiceGetter(this, "aboutNewTabService",
+                                   "@mozilla.org/browser/aboutnewtab-service;1",
+                                   "nsIAboutNewTabService");
+
+this.NewTabURL = {
+
+  get() {
+    return aboutNewTabService.newTabURL;
+  },
+
+  get overridden() {
+    return aboutNewTabService.overridden;
+  },
+
+  override(newURL) {
+    aboutNewTabService.newTabURL = newURL;
+  },
+
+  reset() {
+    aboutNewTabService.resetNewTabURL();
+  }
+};
diff --git a/application/basilisk/components/newtab/NewTabWebChannel.jsm b/application/basilisk/components/newtab/NewTabWebChannel.jsm
new file mode 100644
index 000000000..068515dbc
--- /dev/null
+++ b/application/basilisk/components/newtab/NewTabWebChannel.jsm
@@ -0,0 +1,299 @@
+/* global
+   NewTabPrefsProvider,
+   Services,
+   EventEmitter,
+   Preferences,
+   XPCOMUtils,
+   WebChannel,
+   NewTabRemoteResources
+*/
+/* exported NewTabWebChannel */
+
+"use strict";
+
+this.EXPORTED_SYMBOLS = ["NewTabWebChannel"];
+
+const {utils: Cu} = Components;
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/Preferences.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "NewTabPrefsProvider",
+                                  "resource:///modules/NewTabPrefsProvider.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "NewTabRemoteResources",
+                                  "resource:///modules/NewTabRemoteResources.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "WebChannel",
+                                  "resource://gre/modules/WebChannel.jsm");
+XPCOMUtils.defineLazyGetter(this, "EventEmitter", function() {
+  const {EventEmitter} = Cu.import("resource://devtools/shared/event-emitter.js", {});
+  return EventEmitter;
+});
+
+const CHAN_ID = "newtab";
+const PREF_ENABLED = "browser.newtabpage.remote";
+const PREF_MODE = "browser.newtabpage.remote.mode";
+
+/**
+ * NewTabWebChannel is the conduit for all communication with unprivileged newtab instances.
+ *
+ * It allows for the ability to broadcast to all newtab browsers.
+ * If the browser.newtab.remote pref is false, the object will be in an uninitialized state.
+ *
+ * Mode choices:
+ * 'production': pages from our production CDN
+ * 'staging': pages from our staging CDN
+ * 'test': intended for tests
+ * 'test2': intended for tests
+ * 'dev': intended for development
+ *
+ *  An unknown mode will result in 'production' mode, which is the default
+ *
+ *  Incoming messages are expected to be JSON-serialized and in the format:
+ *
+ *  {
+ *    type: "REQUEST_SCREENSHOT",
+ *    data: {
+ *      url: "https://example.com"
+ *    }
+ *  }
+ *
+ *  Or:
+ *
+ *  {
+ *    type: "REQUEST_SCREENSHOT",
+ *  }
+ *
+ *  Outgoing messages are expected to be objects serializable by structured cloning, in a similar format:
+ *  {
+ *    type: "RECEIVE_SCREENSHOT",
+ *    data: {
+ *      "url": "https://example.com",
+ *      "image": "dataURi:....."
+ *    }
+ *  }
+ */
+let NewTabWebChannelImpl = function NewTabWebChannelImpl() {
+  EventEmitter.decorate(this);
+  this._handlePrefChange = this._handlePrefChange.bind(this);
+  this._incomingMessage = this._incomingMessage.bind(this);
+};
+
+NewTabWebChannelImpl.prototype = {
+  _prefs: {},
+  _channel: null,
+
+  // a WeakMap containing browsers as keys and a weak ref to their principal
+  // as value
+  _principals: null,
+
+  // a Set containing weak refs to browsers
+  _browsers: null,
+
+  /*
+   * Returns current channel's ID
+   */
+  get chanId() {
+    return CHAN_ID;
+  },
+
+  /*
+   * Returns the number of browsers currently tracking
+   */
+  get numBrowsers() {
+    return this._getBrowserRefs().length;
+  },
+
+  /*
+   * Returns current channel's origin
+   */
+  get origin() {
+    if (!(this._prefs.mode in NewTabRemoteResources.MODE_CHANNEL_MAP)) {
+      this._prefs.mode = "production";
+    }
+    return NewTabRemoteResources.MODE_CHANNEL_MAP[this._prefs.mode].origin;
+  },
+
+  /*
+   * Unloads all browsers and principals
+   */
+  _unloadAll() {
+    if (this._principals != null) {
+      this._principals = new WeakMap();
+    }
+    this._browsers = new Set();
+    this.emit("targetUnloadAll");
+  },
+
+  /*
+   * Checks if a browser is known
+   *
+   * This will cause an iteration through all known browsers.
+   * That's ok, we don't expect a lot of browsers
+   */
+  _isBrowserKnown(browser) {
+    for (let bRef of this._getBrowserRefs()) {
+      let b = bRef.get();
+      if (b && b.permanentKey === browser.permanentKey) {
+        return true;
+      }
+    }
+
+    return false;
+  },
+
+  /*
+   * Obtains all known browser refs
+   */
+  _getBrowserRefs() {
+    // Some code may try to emit messages after teardown.
+    if (!this._browsers) {
+      return [];
+    }
+    let refs = [];
+    for (let bRef of this._browsers) {
+      /*
+       * even though we hold a weak ref to browser, it seems that browser
+       * objects aren't gc'd immediately after a tab closes. They stick around
+       * in memory, but thankfully they don't have a documentURI in that case
+       */
+      let browser = bRef.get();
+      if (browser && browser.documentURI) {
+        refs.push(bRef);
+      } else {
+        // need to clean up principals because the browser object is not gc'ed
+        // immediately
+        this._principals.delete(browser);
+        this._browsers.delete(bRef);
+        this.emit("targetUnload");
+      }
+    }
+    return refs;
+  },
+
+  /*
+   * Receives a message from content.
+   *
+   * Keeps track of browsers for broadcast, relays messages to listeners.
+   */
+  _incomingMessage(id, message, target) {
+    if (this.chanId !== id) {
+      Cu.reportError(new Error("NewTabWebChannel unexpected message destination"));
+    }
+
+    /*
+     * need to differentiate by browser, because event targets are created each
+     * time a message is sent.
+     */
+    if (!this._isBrowserKnown(target.browser)) {
+      this._browsers.add(Cu.getWeakReference(target.browser));
+      this._principals.set(target.browser, Cu.getWeakReference(target.principal));
+      this.emit("targetAdd");
+    }
+
+    try {
+      let msg = JSON.parse(message);
+      this.emit(msg.type, {data: msg.data, target});
+    } catch (err) {
+      Cu.reportError(err);
+    }
+  },
+
+  /*
+   * Sends a message to all known browsers
+   */
+  broadcast(actionType, message) {
+    for (let bRef of this._getBrowserRefs()) {
+      let browser = bRef.get();
+      try {
+        let principal = this._principals.get(browser).get();
+        if (principal && browser && browser.documentURI) {
+          this._channel.send({type: actionType, data: message}, {browser, principal});
+        }
+      } catch (e) {
+        Cu.reportError(new Error("NewTabWebChannel WeakRef is dead"));
+        this._principals.delete(browser);
+      }
+    }
+  },
+
+  /*
+   * Sends a message to a specific target
+   */
+  send(actionType, message, target) {
+    try {
+      this._channel.send({type: actionType, data: message}, target);
+    } catch (e) {
+      // Web Channel might be dead
+      Cu.reportError(e);
+    }
+  },
+
+  /*
+   * Pref change observer callback
+   */
+  _handlePrefChange(prefName, newState, forceState) { // eslint-disable-line no-unused-vars
+    switch (prefName) {
+      case PREF_ENABLED:
+        if (!this._prefs.enabled && newState) {
+          // changing state from disabled to enabled
+          this.setupState();
+        } else if (this._prefs.enabled && !newState) {
+          // changing state from enabled to disabled
+          this.tearDownState();
+        }
+        break;
+      case PREF_MODE:
+        if (this._prefs.mode !== newState) {
+          // changing modes
+          this.tearDownState();
+          this.setupState();
+        }
+        break;
+    }
+  },
+
+  /*
+   * Sets up the internal state
+   */
+  setupState() {
+    this._prefs.enabled = Preferences.get(PREF_ENABLED, false);
+
+    let mode = Preferences.get(PREF_MODE, "production");
+    if (!(mode in NewTabRemoteResources.MODE_CHANNEL_MAP)) {
+      mode = "production";
+    }
+    this._prefs.mode = mode;
+    this._principals = new WeakMap();
+    this._browsers = new Set();
+
+    if (this._prefs.enabled) {
+      this._channel = new WebChannel(this.chanId, Services.io.newURI(this.origin));
+      this._channel.listen(this._incomingMessage);
+    }
+  },
+
+  tearDownState() {
+    if (this._channel) {
+      this._channel.stopListening();
+    }
+    this._prefs = {};
+    this._unloadAll();
+    this._channel = null;
+    this._principals = null;
+    this._browsers = null;
+  },
+
+  init() {
+    this.setupState();
+    NewTabPrefsProvider.prefs.on(PREF_ENABLED, this._handlePrefChange);
+    NewTabPrefsProvider.prefs.on(PREF_MODE, this._handlePrefChange);
+  },
+
+  uninit() {
+    this.tearDownState();
+    NewTabPrefsProvider.prefs.off(PREF_ENABLED, this._handlePrefChange);
+    NewTabPrefsProvider.prefs.off(PREF_MODE, this._handlePrefChange);
+  }
+};
+
+let NewTabWebChannel = new NewTabWebChannelImpl();
diff --git a/application/basilisk/components/newtab/PlacesProvider.jsm b/application/basilisk/components/newtab/PlacesProvider.jsm
new file mode 100644
index 000000000..1a0e99141
--- /dev/null
+++ b/application/basilisk/components/newtab/PlacesProvider.jsm
@@ -0,0 +1,245 @@
+/* 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/. */
+
+/* global XPCOMUtils, Services, PlacesUtils, EventEmitter */
+/* global gLinks */
+/* exported PlacesProvider */
+
+"use strict";
+
+this.EXPORTED_SYMBOLS = ["PlacesProvider"];
+
+const {interfaces: Ci, utils: Cu} = Components;
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "PlacesUtils",
+  "resource://gre/modules/PlacesUtils.jsm");
+
+XPCOMUtils.defineLazyGetter(this, "EventEmitter", function() {
+  const {EventEmitter} = Cu.import("resource://devtools/shared/event-emitter.js", {});
+  return EventEmitter;
+});
+
+XPCOMUtils.defineLazyModuleGetter(this, "Task",
+                                  "resource://gre/modules/Task.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "NewTabUtils",
+                                  "resource://gre/modules/NewTabUtils.jsm");
+
+// The maximum number of results PlacesProvider retrieves from history.
+const HISTORY_RESULTS_LIMIT = 100;
+
+/* Queries history to retrieve the most visited sites. Emits events when the
+ * history changes.
+ * Implements the EventEmitter interface.
+ */
+let Links = function Links() {
+  EventEmitter.decorate(this);
+};
+
+Links.prototype = {
+  /**
+   * Set this to change the maximum number of links the provider will provide.
+   */
+  get maxNumLinks() {
+    // getter, so it can't be replaced dynamically
+    return HISTORY_RESULTS_LIMIT;
+  },
+
+  /**
+   * A set of functions called by @mozilla.org/browser/nav-historyservice
+   * All history events are emitted from this object.
+   */
+  historyObserver: {
+    _batchProcessingDepth: 0,
+    _batchCalledFrecencyChanged: false,
+
+    /**
+     * Called by the history service.
+     */
+    onBeginUpdateBatch() {
+      this._batchProcessingDepth += 1;
+    },
+
+    onEndUpdateBatch() {
+      this._batchProcessingDepth -= 1;
+      if (this._batchProcessingDepth == 0 && this._batchCalledFrecencyChanged) {
+        this.onManyFrecenciesChanged();
+        this._batchCalledFrecencyChanged = false;
+      }
+    },
+
+    onDeleteURI: function historyObserver_onDeleteURI(aURI) {
+      // let observers remove sensetive data associated with deleted visit
+      gLinks.emit("deleteURI", {
+        url: aURI.spec,
+      });
+    },
+
+    onClearHistory: function historyObserver_onClearHistory() {
+      gLinks.emit("clearHistory");
+    },
+
+    onFrecencyChanged: function historyObserver_onFrecencyChanged(aURI,
+                           aNewFrecency, aGUID, aHidden, aLastVisitDate) { // jshint ignore:line
+
+      // If something is doing a batch update of history entries we don't want
+      // to do lots of work for each record. So we just track the fact we need
+      // to call onManyFrecenciesChanged() once the batch is complete.
+      if (this._batchProcessingDepth > 0) {
+        this._batchCalledFrecencyChanged = true;
+        return;
+      }
+
+      // The implementation of the query in getLinks excludes hidden and
+      // unvisited pages, so it's important to exclude them here, too.
+      if (!aHidden && aLastVisitDate &&
+          NewTabUtils.linkChecker.checkLoadURI(aURI.spec)) {
+        gLinks.emit("linkChanged", {
+          url: aURI.spec,
+          frecency: aNewFrecency,
+          lastVisitDate: aLastVisitDate,
+          type: "history",
+        });
+      }
+    },
+
+    onManyFrecenciesChanged: function historyObserver_onManyFrecenciesChanged() {
+      // Called when frecencies are invalidated and also when clearHistory is called
+      // See toolkit/components/places/tests/unit/test_frecency_observers.js
+      gLinks.emit("manyLinksChanged");
+    },
+
+    onVisit(aURI, aVisitId, aTime, aSessionId, aReferrerVisitId, aTransitionType,
+            aGuid, aHidden, aVisitCount, aTyped, aLastKnownTitle) {
+      // For new visits, if we're not batch processing, notify for a title update
+      if (!this._batchProcessingDepth && aVisitCount == 1 && aLastKnownTitle) {
+        this.onTitleChanged(aURI, aLastKnownTitle, aGuid);
+      }
+    },
+
+    onTitleChanged: function historyObserver_onTitleChanged(aURI, aNewTitle) {
+      if (NewTabUtils.linkChecker.checkLoadURI(aURI.spec)) {
+        gLinks.emit("linkChanged", {
+          url: aURI.spec,
+          title: aNewTitle
+        });
+      }
+    },
+
+    QueryInterface: XPCOMUtils.generateQI([Ci.nsINavHistoryObserver,
+                                           Ci.nsISupportsWeakReference])
+  },
+
+  /**
+   * Must be called before the provider is used.
+   * Makes it easy to disable under pref
+   */
+  init: function PlacesProvider_init() {
+    try {
+      PlacesUtils.history.addObserver(this.historyObserver, true);
+    } catch (e) {
+      Cu.reportError(e);
+    }
+  },
+
+  /**
+   * Gets the current set of links delivered by this provider.
+   *
+   * @returns {Promise} Returns a promise with the array of links as payload.
+   */
+  getLinks: Task.async(function*() {
+    // Select a single page per host with highest frecency, highest recency.
+    // Choose N top such pages. Note +rev_host, to turn off optimizer per :mak
+    // suggestion.
+    let sqlQuery = `SELECT url, title, frecency,
+                          last_visit_date as lastVisitDate,
+                          "history" as type
+                   FROM moz_places
+                   WHERE frecency in (
+                     SELECT MAX(frecency) as frecency
+                     FROM moz_places
+                     WHERE hidden = 0 AND last_visit_date NOTNULL
+                     GROUP BY +rev_host
+                     ORDER BY frecency DESC
+                     LIMIT :limit
+                   )
+                   GROUP BY rev_host HAVING MAX(lastVisitDate)
+                   ORDER BY frecency DESC, lastVisitDate DESC, url`;
+
+    let links = yield this.executePlacesQuery(sqlQuery, {
+                  columns: ["url", "title", "lastVisitDate", "frecency", "type"],
+                  params: {limit: this.maxNumLinks}
+                });
+
+    return links.filter(link => NewTabUtils.linkChecker.checkLoadURI(link.url));
+  }),
+
+  /**
+   * Executes arbitrary query against places database
+   *
+   * @param {String} aSql
+   *        SQL query to execute
+   * @param {Object} [optional] aOptions
+   *        aOptions.columns - an array of column names. if supplied the returned
+   *        items will consist of objects keyed on column names. Otherwise
+   *        an array of raw values is returned in the select order
+   *        aOptions.param - an object of SQL binding parameters
+   *        aOptions.callback - a callback to handle query rows
+   *
+   * @returns {Promise} Returns a promise with the array of retrieved items
+   */
+  executePlacesQuery: Task.async(function*(aSql, aOptions = {}) {
+    let {columns, params, callback} = aOptions;
+    let items = [];
+    let queryError = null;
+    let conn = yield PlacesUtils.promiseDBConnection();
+    yield conn.executeCached(aSql, params, aRow => {
+      try {
+        // check if caller wants to handle query raws
+        if (callback) {
+          callback(aRow);
+        } else {
+          // otherwise fill in the item and add items array
+          let item = null;
+          // if columns array is given construct an object
+          if (columns && Array.isArray(columns)) {
+            item = {};
+            columns.forEach(column => {
+              item[column] = aRow.getResultByName(column);
+            });
+          } else {
+            // if no columns - make an array of raw values
+            item = [];
+            for (let i = 0; i < aRow.numEntries; i++) {
+              item.push(aRow.getResultByIndex(i));
+            }
+          }
+          items.push(item);
+        }
+      } catch (e) {
+        queryError = e;
+        throw StopIteration;
+      }
+    });
+    if (queryError) {
+      throw new Error(queryError);
+    }
+    return items;
+  }),
+};
+
+/**
+ * Singleton that serves as the default link provider for the grid.
+ */
+const gLinks = new Links(); // jshint ignore:line
+
+let PlacesProvider = {
+  links: gLinks,
+};
+
+// Kept only for backwards-compatibility
+XPCOMUtils.defineLazyGetter(PlacesProvider, "LinkChecker",
+  () => NewTabUtils.linkChecker);
+
diff --git a/application/basilisk/components/newtab/PreviewProvider.jsm b/application/basilisk/components/newtab/PreviewProvider.jsm
new file mode 100644
index 000000000..7e6d06e3d
--- /dev/null
+++ b/application/basilisk/components/newtab/PreviewProvider.jsm
@@ -0,0 +1,49 @@
+/* global XPCOMUtils, BackgroundPageThumbs, FileUtils, PageThumbsStorage, Task, MIMEService */
+/* exported PreviewProvider */
+
+"use strict";
+
+this.EXPORTED_SYMBOLS = ["PreviewProvider"];
+
+const {utils: Cu} = Components;
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Task.jsm");
+Cu.import("resource://gre/modules/PageThumbs.jsm");
+Cu.import("resource://gre/modules/FileUtils.jsm");
+const {OS} = Cu.import("resource://gre/modules/osfile.jsm", {});
+
+XPCOMUtils.defineLazyModuleGetter(this, "BackgroundPageThumbs",
+  "resource://gre/modules/BackgroundPageThumbs.jsm");
+XPCOMUtils.defineLazyServiceGetter(this, "MIMEService",
+  "@mozilla.org/mime;1", "nsIMIMEService");
+
+let PreviewProvider = {
+  /**
+   * Returns a thumbnail as a data URI for a url, creating it if necessary
+   *
+   * @param {String} url
+   *        a url to obtain a thumbnail for
+   * @return {Promise} A Promise that resolves with a base64 encoded thumbnail
+   */
+  getThumbnail: Task.async(function* PreviewProvider_getThumbnail(url) {
+    try {
+      yield BackgroundPageThumbs.captureIfMissing(url);
+      let imgPath = PageThumbsStorage.getFilePathForURL(url);
+
+      // OS.File object used to easily read off-thread
+      let file = yield OS.File.open(imgPath, {read: true, existing: true});
+
+      // nsIFile object needed for MIMEService
+      let nsFile = FileUtils.File(imgPath);
+
+      let contentType = MIMEService.getTypeFromFile(nsFile);
+      let bytes = yield file.read();
+      let encodedData = btoa(String.fromCharCode.apply(null, bytes));
+      file.close();
+      return `data:${contentType};base64,${encodedData}`;
+    } catch (err) {
+      Cu.reportError(`PreviewProvider_getThumbnail error: ${err}`);
+      throw err;
+    }
+  })
+};
diff --git a/application/basilisk/components/newtab/aboutNewTabService.js b/application/basilisk/components/newtab/aboutNewTabService.js
new file mode 100644
index 000000000..a43c4dc22
--- /dev/null
+++ b/application/basilisk/components/newtab/aboutNewTabService.js
@@ -0,0 +1,289 @@
+/*
+ * 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/.
+*/
+
+/* globals XPCOMUtils, NewTabPrefsProvider, Services,
+  Locale, UpdateUtils, NewTabRemoteResources
+*/
+"use strict";
+
+const {utils: Cu, interfaces: Ci} = Components;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "UpdateUtils",
+                                  "resource://gre/modules/UpdateUtils.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "NewTabPrefsProvider",
+                                  "resource:///modules/NewTabPrefsProvider.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "Locale",
+                                  "resource://gre/modules/Locale.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "NewTabRemoteResources",
+                                  "resource:///modules/NewTabRemoteResources.jsm");
+
+const LOCAL_NEWTAB_URL = "chrome://browser/content/newtab/newTab.xhtml";
+
+const REMOTE_NEWTAB_PATH = "/newtab/v%VERSION%/%CHANNEL%/%LOCALE%/index.html";
+
+const ABOUT_URL = "about:newtab";
+
+// Pref that tells if remote newtab is enabled
+const PREF_REMOTE_ENABLED = "browser.newtabpage.remote";
+
+// Pref branch necesssary for testing
+const PREF_REMOTE_CS_TEST = "browser.newtabpage.remote.content-signing-test";
+
+// The preference that tells whether to match the OS locale
+const PREF_MATCH_OS_LOCALE = "intl.locale.matchOS";
+
+// The preference that tells what locale the user selected
+const PREF_SELECTED_LOCALE = "general.useragent.locale";
+
+// The preference that tells what remote mode is enabled.
+const PREF_REMOTE_MODE = "browser.newtabpage.remote.mode";
+
+// The preference that tells which remote version is expected.
+const PREF_REMOTE_VERSION = "browser.newtabpage.remote.version";
+
+const VALID_CHANNELS = new Set(["esr", "release", "beta", "aurora", "nightly"]);
+
+function AboutNewTabService() {
+  NewTabPrefsProvider.prefs.on(PREF_REMOTE_ENABLED, this._handleToggleEvent.bind(this));
+
+  this._updateRemoteMaybe = this._updateRemoteMaybe.bind(this);
+
+  // trigger remote change if needed, according to pref
+  this.toggleRemote(Services.prefs.getBoolPref(PREF_REMOTE_ENABLED));
+}
+
+/*
+ * A service that allows for the overriding, at runtime, of the newtab page's url.
+ * Additionally, the service manages pref state between a remote and local newtab page.
+ *
+ * There is tight coupling with browser/about/AboutRedirector.cpp.
+ *
+ * 1. Browser chrome access:
+ *
+ * When the user issues a command to open a new tab page, usually clicking a button
+ * in the browser chrome or using shortcut keys, the browser chrome code invokes the
+ * service to obtain the newtab URL. It then loads that URL in a new tab.
+ *
+ * When not overridden, the default URL emitted by the service is "about:newtab".
+ * When overridden, it returns the overriden URL.
+ *
+ * 2. Redirector Access:
+ *
+ * When the URL loaded is about:newtab, the default behavior, or when entered in the
+ * URL bar, the redirector is hit. The service is then called to return either of
+ * two URLs, a chrome or remote one, based on the browser.newtabpage.remote pref.
+ *
+ * NOTE: "about:newtab" will always result in a default newtab page, and never an overridden URL.
+ *
+ * Access patterns:
+ *
+ * The behavior is different when accessing the service via browser chrome or via redirector
+ * largely to maintain compatibility with expectations of add-on developers.
+ *
+ * Loading a chrome resource, or an about: URL in the redirector with either the
+ * LOAD_NORMAL or LOAD_REPLACE flags yield unexpected behaviors, so a roundtrip
+ * to the redirector from browser chrome is avoided.
+ */
+AboutNewTabService.prototype = {
+
+  _newTabURL: ABOUT_URL,
+  _remoteEnabled: false,
+  _remoteURL: null,
+  _overridden: false,
+
+  classID: Components.ID("{dfcd2adc-7867-4d3a-ba70-17501f208142}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIAboutNewTabService]),
+  _xpcom_categories: [{
+    service: true
+  }],
+
+  _handleToggleEvent(prefName, stateEnabled, forceState) { // jshint unused:false
+    if (this.toggleRemote(stateEnabled, forceState)) {
+      Services.obs.notifyObservers(null, "newtab-url-changed", ABOUT_URL);
+    }
+  },
+
+  /**
+   * React to changes to the remote newtab pref.
+   *
+   * If browser.newtabpage.remote is true, this will change the default URL to the
+   * remote newtab page URL. If browser.newtabpage.remote is false, the default URL
+   * will be a local chrome URL.
+   *
+   * This will only act if there is a change of state and if not overridden.
+   *
+   * @returns {Boolean} Returns if there has been a state change
+   *
+   * @param {Boolean}   stateEnabled    remote state to set to
+   * @param {Boolean}   forceState      force state change
+   */
+  toggleRemote(stateEnabled, forceState) {
+
+    if (!forceState && (this._overriden || stateEnabled === this._remoteEnabled)) {
+      // exit there is no change of state
+      return false;
+    }
+
+    let csTest = Services.prefs.getBoolPref(PREF_REMOTE_CS_TEST);
+    if (stateEnabled) {
+      if (!csTest) {
+        this._remoteURL = this.generateRemoteURL();
+      } else {
+        this._remoteURL = this._newTabURL;
+      }
+      NewTabPrefsProvider.prefs.on(
+        PREF_SELECTED_LOCALE,
+        this._updateRemoteMaybe);
+      NewTabPrefsProvider.prefs.on(
+        PREF_MATCH_OS_LOCALE,
+        this._updateRemoteMaybe);
+      NewTabPrefsProvider.prefs.on(
+        PREF_REMOTE_MODE,
+        this._updateRemoteMaybe);
+      NewTabPrefsProvider.prefs.on(
+        PREF_REMOTE_VERSION,
+        this._updateRemoteMaybe);
+      this._remoteEnabled = true;
+    } else {
+      NewTabPrefsProvider.prefs.off(PREF_SELECTED_LOCALE, this._updateRemoteMaybe);
+      NewTabPrefsProvider.prefs.off(PREF_MATCH_OS_LOCALE, this._updateRemoteMaybe);
+      NewTabPrefsProvider.prefs.off(PREF_REMOTE_MODE, this._updateRemoteMaybe);
+      NewTabPrefsProvider.prefs.off(PREF_REMOTE_VERSION, this._updateRemoteMaybe);
+      this._remoteEnabled = false;
+    }
+    if (!csTest) {
+      this._newTabURL = ABOUT_URL;
+    }
+    return true;
+  },
+
+  /*
+   * Generate a default url based on remote mode, version, locale and update channel
+   */
+  generateRemoteURL() {
+    let releaseName = this.releaseFromUpdateChannel(UpdateUtils.UpdateChannel);
+    let path = REMOTE_NEWTAB_PATH
+      .replace("%VERSION%", this.remoteVersion)
+      .replace("%LOCALE%", Locale.getLocale())
+      .replace("%CHANNEL%", releaseName);
+    let mode = Services.prefs.getCharPref(PREF_REMOTE_MODE);
+    if (!(mode in NewTabRemoteResources.MODE_CHANNEL_MAP)) {
+      mode = "production";
+    }
+    return NewTabRemoteResources.MODE_CHANNEL_MAP[mode].origin + path;
+  },
+
+  /*
+   * Returns the default URL.
+   *
+   * This URL only depends on the browser.newtabpage.remote pref. Overriding
+   * the newtab page has no effect on the result of this function.
+   *
+   * The result is also the remote URL if this is in a test (PREF_REMOTE_CS_TEST)
+   *
+   * @returns {String} the default newtab URL, remote or local depending on browser.newtabpage.remote
+   */
+  get defaultURL() {
+    let csTest = Services.prefs.getBoolPref(PREF_REMOTE_CS_TEST);
+    if (this._remoteEnabled || csTest) {
+      return this._remoteURL;
+    }
+    return LOCAL_NEWTAB_URL;
+  },
+
+  /*
+   * Updates the remote location when the page is not overriden.
+   *
+   * Useful when there is a dependent pref change
+   */
+  _updateRemoteMaybe() {
+    if (!this._remoteEnabled || this._overridden) {
+      return;
+    }
+
+    let url = this.generateRemoteURL();
+    if (url !== this._remoteURL) {
+      this._remoteURL = url;
+      Services.obs.notifyObservers(null, "newtab-url-changed",
+        this._remoteURL);
+    }
+  },
+
+  /**
+   * Returns the release name from an Update Channel name
+   *
+   * @returns {String} a release name based on the update channel. Defaults to nightly
+   */
+  releaseFromUpdateChannel(channelName) {
+    return VALID_CHANNELS.has(channelName) ? channelName : "nightly";
+  },
+
+  get newTabURL() {
+    return this._newTabURL;
+  },
+
+  get remoteVersion() {
+    return Services.prefs.getCharPref(PREF_REMOTE_VERSION);
+  },
+
+  get remoteReleaseName() {
+    return this.releaseFromUpdateChannel(UpdateUtils.UpdateChannel);
+  },
+
+  set newTabURL(aNewTabURL) {
+    let csTest = Services.prefs.getBoolPref(PREF_REMOTE_CS_TEST);
+    aNewTabURL = aNewTabURL.trim();
+    if (aNewTabURL === ABOUT_URL) {
+      // avoid infinite redirects in case one sets the URL to about:newtab
+      this.resetNewTabURL();
+      return;
+    } else if (aNewTabURL === "") {
+      aNewTabURL = "about:blank";
+    }
+    let remoteURL = this.generateRemoteURL();
+    let prefRemoteEnabled = Services.prefs.getBoolPref(PREF_REMOTE_ENABLED);
+    let isResetLocal = !prefRemoteEnabled && aNewTabURL === LOCAL_NEWTAB_URL;
+    let isResetRemote = prefRemoteEnabled && aNewTabURL === remoteURL;
+
+    if (isResetLocal || isResetRemote) {
+      if (this._overriden && !csTest) {
+        // only trigger a reset if previously overridden and this is no test
+        this.resetNewTabURL();
+      }
+      return;
+    }
+    // turn off remote state if needed
+    if (!csTest) {
+      this.toggleRemote(false);
+    } else {
+      // if this is a test, we want the remoteURL to be set
+      this._remoteURL = aNewTabURL;
+    }
+    this._newTabURL = aNewTabURL;
+    this._overridden = true;
+    Services.obs.notifyObservers(null, "newtab-url-changed", this._newTabURL);
+  },
+
+  get overridden() {
+    return this._overridden;
+  },
+
+  get remoteEnabled() {
+    return this._remoteEnabled;
+  },
+
+  resetNewTabURL() {
+    this._overridden = false;
+    this._newTabURL = ABOUT_URL;
+    this.toggleRemote(Services.prefs.getBoolPref(PREF_REMOTE_ENABLED), true);
+    Services.obs.notifyObservers(null, "newtab-url-changed", this._newTabURL);
+  }
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([AboutNewTabService]);
diff --git a/application/basilisk/components/newtab/moz.build b/application/basilisk/components/newtab/moz.build
new file mode 100644
index 000000000..3d3be6454
--- /dev/null
+++ b/application/basilisk/components/newtab/moz.build
@@ -0,0 +1,27 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+EXTRA_JS_MODULES += [
+    'NewTabMessages.jsm',
+    'NewTabPrefsProvider.jsm',
+    'NewTabRemoteResources.jsm',
+    'NewTabSearchProvider.jsm',
+    'NewTabURL.jsm',
+    'NewTabWebChannel.jsm',
+    'PlacesProvider.jsm',
+    'PreviewProvider.jsm'
+]
+
+XPIDL_SOURCES += [
+    'nsIAboutNewTabService.idl',
+]
+
+XPIDL_MODULE = 'browser-newtab'
+
+EXTRA_COMPONENTS += [
+    'aboutNewTabService.js',
+    'NewTabComponents.manifest',
+]
diff --git a/application/basilisk/components/newtab/nsIAboutNewTabService.idl b/application/basilisk/components/newtab/nsIAboutNewTabService.idl
new file mode 100644
index 000000000..bc25c7492
--- /dev/null
+++ b/application/basilisk/components/newtab/nsIAboutNewTabService.idl
@@ -0,0 +1,63 @@
+/* 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/. */
+
+#include "nsISupports.idl"
+
+/**
+ * Allows to override about:newtab to point to a different location
+ * than the one specified within AboutRedirector.cpp
+ */
+
+[scriptable, uuid(dfcd2adc-7867-4d3a-ba70-17501f208142)]
+interface nsIAboutNewTabService : nsISupports
+{
+  /**
+   * Returns the url of the resource for the newtab page if not overridden,
+   * otherwise a string represenation of the new URL.
+   */
+  attribute ACString newTabURL;
+
+  /**
+   * Returns the default URL (remote or local depending on pref)
+   */
+  attribute ACString defaultURL;
+
+  /**
+   * Returns true if the default resource got overridden.
+   */
+  readonly attribute bool overridden;
+
+  /**
+   * Returns true if the default resource is remotely hosted and isn't
+   * overridden
+   */
+  readonly attribute bool remoteEnabled;
+
+
+  /**
+  * Returns the version of the remote newtab page expected
+  */
+  readonly attribute ACString remoteVersion;
+
+  /**
+   * Returns the expected channel for the remote the newtab page
+   */
+  readonly attribute ACString remoteReleaseName;
+
+  /**
+   * Generates and returns the remote newtab page url
+   */
+  ACString generateRemoteURL();
+
+  /**
+   * Returns a remote new tab release name given an update channel name
+   */
+  ACString releaseFromUpdateChannel(in ACString channelName);
+
+  /**
+   * Resets to the default resource and also resets the
+   * overridden attribute to false.
+   */
+  void resetNewTabURL();
+};