Merge branch 'ext-work'

16 files changed, 2442 insertions, 0 deletions

diff --git a/toolkit/jetpack/sdk/content/content-worker.js b/toolkit/jetpack/sdk/content/content-worker.js
new file mode 100644
index 000000000..0a8225733
--- /dev/null
+++ b/toolkit/jetpack/sdk/content/content-worker.js
@@ -0,0 +1,305 @@
+/* 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/. */
+
+Object.freeze({
+  // TODO: Bug 727854 Use same implementation than common JS modules,
+  // i.e. EventEmitter module
+
+  /**
+   * Create an EventEmitter instance.
+   */
+  createEventEmitter: function createEventEmitter(emit) {
+    let listeners = Object.create(null);
+    let eventEmitter = Object.freeze({
+      emit: emit,
+      on: function on(name, callback) {
+        if (typeof callback !== "function")
+          return this;
+        if (!(name in listeners))
+          listeners[name] = [];
+        listeners[name].push(callback);
+        return this;
+      },
+      once: function once(name, callback) {
+        eventEmitter.on(name, function onceCallback() {
+          eventEmitter.removeListener(name, onceCallback);
+          callback.apply(callback, arguments);
+        });
+      },
+      removeListener: function removeListener(name, callback) {
+        if (!(name in listeners))
+          return;
+        let index = listeners[name].indexOf(callback);
+        if (index == -1)
+          return;
+        listeners[name].splice(index, 1);
+      }
+    });
+    function onEvent(name) {
+      if (!(name in listeners))
+        return [];
+      let args = Array.slice(arguments, 1);
+      let results = [];
+      for (let callback of listeners[name]) {
+        results.push(callback.apply(null, args));
+      }
+      return results;
+    }
+    return {
+      eventEmitter: eventEmitter,
+      emit: onEvent
+    };
+  },
+
+  /**
+   * Create an EventEmitter instance to communicate with chrome module
+   * by passing only strings between compartments.
+   * This function expects `emitToChrome` function, that allows to send
+   * events to the chrome module. It returns the EventEmitter as `pipe`
+   * attribute, and, `onChromeEvent` a function that allows chrome module
+   * to send event into the EventEmitter.
+   *
+   *                  pipe.emit --> emitToChrome
+   *              onChromeEvent --> callback registered through pipe.on
+   */
+  createPipe: function createPipe(emitToChrome) {
+    let ContentWorker = this;
+    function onEvent(type, ...args) {
+      // JSON.stringify is buggy with cross-sandbox values,
+      // it may return "{}" on functions. Use a replacer to match them correctly.
+      let replacer = (k, v) =>
+        typeof(v) === "function"
+          ? (type === "console" ? Function.toString.call(v) : void(0))
+          : v;
+
+      let str = JSON.stringify([type, ...args], replacer);
+      emitToChrome(str);
+    }
+
+    let { eventEmitter, emit } =
+      ContentWorker.createEventEmitter(onEvent);
+
+    return {
+      pipe: eventEmitter,
+      onChromeEvent: function onChromeEvent(array) {
+        // We either receive a stringified array, or a real array.
+        // We still allow to pass an array of objects, in WorkerSandbox.emitSync
+        // in order to allow sending DOM node reference between content script
+        // and modules (only used for context-menu API)
+        let args = typeof array == "string" ? JSON.parse(array) : array;
+        return emit.apply(null, args);
+      }
+    };
+  },
+
+  injectConsole: function injectConsole(exports, pipe) {
+    exports.console = Object.freeze({
+      log: pipe.emit.bind(null, "console", "log"),
+      info: pipe.emit.bind(null, "console", "info"),
+      warn: pipe.emit.bind(null, "console", "warn"),
+      error: pipe.emit.bind(null, "console", "error"),
+      debug: pipe.emit.bind(null, "console", "debug"),
+      exception: pipe.emit.bind(null, "console", "exception"),
+      trace: pipe.emit.bind(null, "console", "trace"),
+      time: pipe.emit.bind(null, "console", "time"),
+      timeEnd: pipe.emit.bind(null, "console", "timeEnd")
+    });
+  },
+
+  injectTimers: function injectTimers(exports, chromeAPI, pipe, console) {
+    // wrapped functions from `'timer'` module.
+    // Wrapper adds `try catch` blocks to the callbacks in order to
+    // emit `error` event if exception is thrown in
+    // the Worker global scope.
+    // @see http://www.w3.org/TR/workers/#workerutils
+
+    // List of all living timeouts/intervals
+    let _timers = Object.create(null);
+
+    // Keep a reference to original timeout functions
+    let {
+      setTimeout: chromeSetTimeout,
+      setInterval: chromeSetInterval,
+      clearTimeout: chromeClearTimeout,
+      clearInterval: chromeClearInterval
+    } = chromeAPI.timers;
+
+    function registerTimer(timer) {
+      let registerMethod = null;
+      if (timer.kind == "timeout")
+        registerMethod = chromeSetTimeout;
+      else if (timer.kind == "interval")
+        registerMethod = chromeSetInterval;
+      else
+        throw new Error("Unknown timer kind: " + timer.kind);
+
+      if (typeof timer.fun == 'string') {
+        let code = timer.fun;
+        timer.fun = () => chromeAPI.sandbox.evaluate(exports, code);
+      } else if (typeof timer.fun != 'function') {
+        throw new Error('Unsupported callback type' + typeof timer.fun);
+      }
+
+      let id = registerMethod(onFire, timer.delay);
+      function onFire() {
+        try {
+          if (timer.kind == "timeout")
+            delete _timers[id];
+          timer.fun.apply(null, timer.args);
+        } catch(e) {
+          console.exception(e);
+          let wrapper = {
+            instanceOfError: instanceOf(e, Error),
+            value: e,
+          };
+          if (wrapper.instanceOfError) {
+            wrapper.value = {
+              message: e.message,
+              fileName: e.fileName,
+              lineNumber: e.lineNumber,
+              stack: e.stack,
+              name: e.name,
+            };
+          }
+          pipe.emit('error', wrapper);
+        }
+      }
+      _timers[id] = timer;
+      return id;
+    }
+
+    // copied from sdk/lang/type.js since modules are not available here
+    function instanceOf(value, Type) {
+      var isConstructorNameSame;
+      var isConstructorSourceSame;
+
+      // If `instanceof` returned `true` we know result right away.
+      var isInstanceOf = value instanceof Type;
+
+      // If `instanceof` returned `false` we do ducktype check since `Type` may be
+      // from a different sandbox. If a constructor of the `value` or a constructor
+      // of the value's prototype has same name and source we assume that it's an
+      // instance of the Type.
+      if (!isInstanceOf && value) {
+        isConstructorNameSame = value.constructor.name === Type.name;
+        isConstructorSourceSame = String(value.constructor) == String(Type);
+        isInstanceOf = (isConstructorNameSame && isConstructorSourceSame) ||
+                        instanceOf(Object.getPrototypeOf(value), Type);
+      }
+      return isInstanceOf;
+    }
+
+    function unregisterTimer(id) {
+      if (!(id in _timers))
+        return;
+      let { kind } = _timers[id];
+      delete _timers[id];
+      if (kind == "timeout")
+        chromeClearTimeout(id);
+      else if (kind == "interval")
+        chromeClearInterval(id);
+      else
+        throw new Error("Unknown timer kind: " + kind);
+    }
+
+    function disableAllTimers() {
+      Object.keys(_timers).forEach(unregisterTimer);
+    }
+
+    exports.setTimeout = function ContentScriptSetTimeout(callback, delay) {
+      return registerTimer({
+        kind: "timeout",
+        fun: callback,
+        delay: delay,
+        args: Array.slice(arguments, 2)
+      });
+    };
+    exports.clearTimeout = function ContentScriptClearTimeout(id) {
+      unregisterTimer(id);
+    };
+
+    exports.setInterval = function ContentScriptSetInterval(callback, delay) {
+      return registerTimer({
+        kind: "interval",
+        fun: callback,
+        delay: delay,
+        args: Array.slice(arguments, 2)
+      });
+    };
+    exports.clearInterval = function ContentScriptClearInterval(id) {
+      unregisterTimer(id);
+    };
+
+    // On page-hide, save a list of all existing timers before disabling them,
+    // in order to be able to restore them on page-show.
+    // These events are fired when the page goes in/out of bfcache.
+    // https://developer.mozilla.org/En/Working_with_BFCache
+    let frozenTimers = [];
+    pipe.on("pageshow", function onPageShow() {
+      frozenTimers.forEach(registerTimer);
+    });
+    pipe.on("pagehide", function onPageHide() {
+      frozenTimers = [];
+      for (let id in _timers)
+        frozenTimers.push(_timers[id]);
+      disableAllTimers();
+      // Some other pagehide listeners may register some timers that won't be
+      // frozen as this particular pagehide listener is called first.
+      // So freeze these timers on next cycle.
+      chromeSetTimeout(function () {
+        for (let id in _timers)
+          frozenTimers.push(_timers[id]);
+        disableAllTimers();
+      }, 0);
+    });
+
+    // Unregister all timers when the page is destroyed
+    // (i.e. when it is removed from bfcache)
+    pipe.on("detach", function clearTimeouts() {
+      disableAllTimers();
+      _timers = {};
+      frozenTimers = [];
+    });
+  },
+
+  injectMessageAPI: function injectMessageAPI(exports, pipe, console) {
+
+    let ContentWorker = this;
+    let { eventEmitter: port, emit : portEmit } =
+      ContentWorker.createEventEmitter(pipe.emit.bind(null, "event"));
+    pipe.on("event", portEmit);
+
+    let self = {
+      port: port,
+      postMessage: pipe.emit.bind(null, "message"),
+      on: pipe.on.bind(null),
+      once: pipe.once.bind(null),
+      removeListener: pipe.removeListener.bind(null),
+    };
+    Object.defineProperty(exports, "self", {
+      value: self
+    });
+  },
+
+  injectOptions: function (exports, options) {
+    Object.defineProperty( exports.self, "options", { value: JSON.parse( options ) });
+  },
+
+  inject: function (exports, chromeAPI, emitToChrome, options) {
+    let ContentWorker = this;
+    let { pipe, onChromeEvent } =
+      ContentWorker.createPipe(emitToChrome);
+
+    ContentWorker.injectConsole(exports, pipe);
+    ContentWorker.injectTimers(exports, chromeAPI, pipe, exports.console);
+    ContentWorker.injectMessageAPI(exports, pipe, exports.console);
+    if ( options !== undefined ) {
+      ContentWorker.injectOptions(exports, options);
+    }
+
+    Object.freeze( exports.self );
+
+    return onChromeEvent;
+  }
+});
diff --git a/toolkit/jetpack/sdk/content/content.js b/toolkit/jetpack/sdk/content/content.js
new file mode 100644
index 000000000..9655223a3
--- /dev/null
+++ b/toolkit/jetpack/sdk/content/content.js
@@ -0,0 +1,17 @@
+/* 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";
+
+module.metadata = {
+  "stability": "deprecated"
+};
+
+const { deprecateUsage } = require('../util/deprecate');
+
+Object.defineProperty(exports, "Worker", {
+  get: function() {
+    deprecateUsage('`sdk/content/content` is deprecated. Please use `sdk/content/worker` directly.');
+    return require('./worker').Worker;
+  }
+});
diff --git a/toolkit/jetpack/sdk/content/context-menu.js b/toolkit/jetpack/sdk/content/context-menu.js
new file mode 100644
index 000000000..2955e2f09
--- /dev/null
+++ b/toolkit/jetpack/sdk/content/context-menu.js
@@ -0,0 +1,408 @@
+/* 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 { Class } = require("../core/heritage");
+const self = require("../self");
+const { WorkerChild } = require("./worker-child");
+const { getInnerId } = require("../window/utils");
+const { Ci } = require("chrome");
+const { Services } = require("resource://gre/modules/Services.jsm");
+const system = require('../system/events');
+const { process } = require('../remote/child');
+
+// These functions are roughly copied from sdk/selection which doesn't work
+// in the content process
+function getElementWithSelection(window) {
+  let element = Services.focus.getFocusedElementForWindow(window, false, {});
+  if (!element)
+    return null;
+
+  try {
+    // Accessing selectionStart and selectionEnd on e.g. a button
+    // results in an exception thrown as per the HTML5 spec.  See
+    // http://www.whatwg.org/specs/web-apps/current-work/multipage/association-of-controls-and-forms.html#textFieldSelection
+
+    let { value, selectionStart, selectionEnd } = element;
+
+    let hasSelection = typeof value === "string" &&
+                      !isNaN(selectionStart) &&
+                      !isNaN(selectionEnd) &&
+                      selectionStart !== selectionEnd;
+
+    return hasSelection ? element : null;
+  }
+  catch (err) {
+    console.exception(err);
+    return null;
+  }
+}
+
+function safeGetRange(selection, rangeNumber) {
+  try {
+    let { rangeCount } = selection;
+    let range = null;
+
+    for (let rangeNumber = 0; rangeNumber < rangeCount; rangeNumber++ ) {
+      range = selection.getRangeAt(rangeNumber);
+
+      if (range && range.toString())
+        break;
+
+      range = null;
+    }
+
+    return range;
+  }
+  catch (e) {
+    return null;
+  }
+}
+
+function getSelection(window) {
+  let selection = window.getSelection();
+  let range = safeGetRange(selection);
+  if (range)
+    return range.toString();
+
+  let node = getElementWithSelection(window);
+  if (!node)
+    return null;
+
+  return node.value.substring(node.selectionStart, node.selectionEnd);
+}
+
+//These are used by PageContext.isCurrent below. If the popupNode or any of
+//its ancestors is one of these, Firefox uses a tailored context menu, and so
+//the page context doesn't apply.
+const NON_PAGE_CONTEXT_ELTS = [
+  Ci.nsIDOMHTMLAnchorElement,
+  Ci.nsIDOMHTMLAppletElement,
+  Ci.nsIDOMHTMLAreaElement,
+  Ci.nsIDOMHTMLButtonElement,
+  Ci.nsIDOMHTMLCanvasElement,
+  Ci.nsIDOMHTMLEmbedElement,
+  Ci.nsIDOMHTMLImageElement,
+  Ci.nsIDOMHTMLInputElement,
+  Ci.nsIDOMHTMLMapElement,
+  Ci.nsIDOMHTMLMediaElement,
+  Ci.nsIDOMHTMLMenuElement,
+  Ci.nsIDOMHTMLObjectElement,
+  Ci.nsIDOMHTMLOptionElement,
+  Ci.nsIDOMHTMLSelectElement,
+  Ci.nsIDOMHTMLTextAreaElement,
+];
+
+// List all editable types of inputs.  Or is it better to have a list
+// of non-editable inputs?
+var editableInputs = {
+  email: true,
+  number: true,
+  password: true,
+  search: true,
+  tel: true,
+  text: true,
+  textarea: true,
+  url: true
+};
+
+var CONTEXTS = {};
+
+var Context = Class({
+  initialize: function(id) {
+    this.id = id;
+  },
+
+  adjustPopupNode: function adjustPopupNode(popupNode) {
+    return popupNode;
+  },
+
+  // Gets state to pass through to the parent process for the node the user
+  // clicked on
+  getState: function(popupNode) {
+    return false;
+  }
+});
+
+// Matches when the context-clicked node doesn't have any of
+// NON_PAGE_CONTEXT_ELTS in its ancestors
+CONTEXTS.PageContext = Class({
+  extends: Context,
+
+  getState: function(popupNode) {
+    // If there is a selection in the window then this context does not match
+    if (!popupNode.ownerDocument.defaultView.getSelection().isCollapsed)
+      return false;
+
+    // If the clicked node or any of its ancestors is one of the blocked
+    // NON_PAGE_CONTEXT_ELTS then this context does not match
+    while (!(popupNode instanceof Ci.nsIDOMDocument)) {
+      if (NON_PAGE_CONTEXT_ELTS.some(type => popupNode instanceof type))
+        return false;
+
+      popupNode = popupNode.parentNode;
+    }
+
+    return true;
+  }
+});
+
+// Matches when there is an active selection in the window
+CONTEXTS.SelectionContext = Class({
+  extends: Context,
+
+  getState: function(popupNode) {
+    if (!popupNode.ownerDocument.defaultView.getSelection().isCollapsed)
+      return true;
+
+    try {
+      // The node may be a text box which has selectionStart and selectionEnd
+      // properties. If not this will throw.
+      let { selectionStart, selectionEnd } = popupNode;
+      return !isNaN(selectionStart) && !isNaN(selectionEnd) &&
+             selectionStart !== selectionEnd;
+    }
+    catch (e) {
+      return false;
+    }
+  }
+});
+
+// Matches when the context-clicked node or any of its ancestors matches the
+// selector given
+CONTEXTS.SelectorContext = Class({
+  extends: Context,
+
+  initialize: function initialize(id, selector) {
+    Context.prototype.initialize.call(this, id);
+    this.selector = selector;
+  },
+
+  adjustPopupNode: function adjustPopupNode(popupNode) {
+    let selector = this.selector;
+
+    while (!(popupNode instanceof Ci.nsIDOMDocument)) {
+      if (popupNode.matches(selector))
+        return popupNode;
+
+      popupNode = popupNode.parentNode;
+    }
+
+    return null;
+  },
+
+  getState: function(popupNode) {
+    return !!this.adjustPopupNode(popupNode);
+  }
+});
+
+// Matches when the page url matches any of the patterns given
+CONTEXTS.URLContext = Class({
+  extends: Context,
+
+  getState: function(popupNode) {
+    return popupNode.ownerDocument.URL;
+  }
+});
+
+// Matches when the user-supplied predicate returns true
+CONTEXTS.PredicateContext = Class({
+  extends: Context,
+
+  getState: function(node) {
+    let window = node.ownerDocument.defaultView;
+    let data = {};
+
+    data.documentType = node.ownerDocument.contentType;
+
+    data.documentURL = node.ownerDocument.location.href;
+    data.targetName = node.nodeName.toLowerCase();
+    data.targetID = node.id || null ;
+
+    if ((data.targetName === 'input' && editableInputs[node.type]) ||
+        data.targetName === 'textarea') {
+      data.isEditable = !node.readOnly && !node.disabled;
+    }
+    else {
+      data.isEditable = node.isContentEditable;
+    }
+
+    data.selectionText = getSelection(window, "TEXT");
+
+    data.srcURL = node.src || null;
+    data.value = node.value || null;
+
+    while (!data.linkURL && node) {
+      data.linkURL = node.href || null;
+      node = node.parentNode;
+    }
+
+    return data;
+  },
+});
+
+function instantiateContext({ id, type, args }) {
+  if (!(type in CONTEXTS)) {
+    console.error("Attempt to use unknown context " + type);
+    return;
+  }
+  return new CONTEXTS[type](id, ...args);
+}
+
+var ContextWorker = Class({
+  implements: [ WorkerChild ],
+
+  // Calls the context workers context listeners and returns the first result
+  // that is either a string or a value that evaluates to true. If all of the
+  // listeners returned false then returns false. If there are no listeners,
+  // returns true (show the menu item by default).
+  getMatchedContext: function getCurrentContexts(popupNode) {
+    let results = this.sandbox.emitSync("context", popupNode);
+    if (!results.length)
+      return true;
+    return results.reduce((val, result) => val || result);
+  },
+
+  // Emits a click event in the worker's port. popupNode is the node that was
+  // context-clicked, and clickedItemData is the data of the item that was
+  // clicked.
+  fireClick: function fireClick(popupNode, clickedItemData) {
+    this.sandbox.emitSync("click", popupNode, clickedItemData);
+  }
+});
+
+// Gets the item's content script worker for a window, creating one if necessary
+// Once created it will be automatically destroyed when the window unloads.
+// If there is not content scripts for the item then null will be returned.
+function getItemWorkerForWindow(item, window) {
+  if (!item.contentScript && !item.contentScriptFile)
+    return null;
+
+  let id = getInnerId(window);
+  let worker = item.workerMap.get(id);
+
+  if (worker)
+    return worker;
+
+  worker = ContextWorker({
+    id: item.id,
+    window,
+    manager: item.manager,
+    contentScript: item.contentScript,
+    contentScriptFile: item.contentScriptFile,
+    onDetach: function() {
+      item.workerMap.delete(id);
+    }
+  });
+
+  item.workerMap.set(id, worker);
+
+  return worker;
+}
+
+// A very simple remote proxy for every item. It's job is to provide data for
+// the main process to use to determine visibility state and to call into
+// content scripts when clicked.
+var RemoteItem = Class({
+  initialize: function(options, manager) {
+    this.id = options.id;
+    this.contexts = options.contexts.map(instantiateContext);
+    this.contentScript = options.contentScript;
+    this.contentScriptFile = options.contentScriptFile;
+
+    this.manager = manager;
+
+    this.workerMap = new Map();
+    keepAlive.set(this.id, this);
+  },
+
+  destroy: function() {
+    for (let worker of this.workerMap.values()) {
+      worker.destroy();
+    }
+    keepAlive.delete(this.id);
+  },
+
+  activate: function(popupNode, data) {
+    let worker = getItemWorkerForWindow(this, popupNode.ownerDocument.defaultView);
+    if (!worker)
+      return;
+
+    for (let context of this.contexts)
+      popupNode = context.adjustPopupNode(popupNode);
+
+    worker.fireClick(popupNode, data);
+  },
+
+  // Fills addonInfo with state data to send through to the main process
+  getContextState: function(popupNode, addonInfo) {
+    if (!(self.id in addonInfo)) {
+      addonInfo[self.id] = {
+        processID: process.id,
+        items: {}
+      };
+    }
+
+    let worker = getItemWorkerForWindow(this, popupNode.ownerDocument.defaultView);
+    let contextStates = {};
+    for (let context of this.contexts)
+      contextStates[context.id] = context.getState(popupNode);
+
+    addonInfo[self.id].items[this.id] = {
+      // It isn't ideal to create a PageContext for every item but there isn't
+      // a good shared place to do it.
+      pageContext: (new CONTEXTS.PageContext()).getState(popupNode),
+      contextStates,
+      hasWorker: !!worker,
+      workerContext: worker ? worker.getMatchedContext(popupNode) : true
+    }
+  }
+});
+exports.RemoteItem = RemoteItem;
+
+// Holds remote items for this frame.
+var keepAlive = new Map();
+
+// Called to create remote proxies for items. If they already exist we destroy
+// and recreate. This can happen if the item changes in some way or in odd
+// timing cases where the frame script is create around the same time as the
+// item is created in the main process
+process.port.on('sdk/contextmenu/createitems', (process, items) => {
+  for (let itemoptions of items) {
+    let oldItem = keepAlive.get(itemoptions.id);
+    if (oldItem) {
+      oldItem.destroy();
+    }
+
+    let item = new RemoteItem(itemoptions, this);
+  }
+});
+
+process.port.on('sdk/contextmenu/destroyitems', (process, items) => {
+  for (let id of items) {
+    let item = keepAlive.get(id);
+    item.destroy();
+  }
+});
+
+var lastPopupNode = null;
+
+system.on('content-contextmenu', ({ subject }) => {
+  let { event: { target: popupNode }, addonInfo } = subject.wrappedJSObject;
+  lastPopupNode = popupNode;
+
+  for (let item of keepAlive.values()) {
+    item.getContextState(popupNode, addonInfo);
+  }
+}, true);
+
+process.port.on('sdk/contextmenu/activateitems', (process, items, data) => {
+  for (let id of items) {
+    let item = keepAlive.get(id);
+    if (!item)
+      continue;
+
+    item.activate(lastPopupNode, data);
+  }
+});
diff --git a/toolkit/jetpack/sdk/content/events.js b/toolkit/jetpack/sdk/content/events.js
new file mode 100644
index 000000000..c085b6179
--- /dev/null
+++ b/toolkit/jetpack/sdk/content/events.js
@@ -0,0 +1,57 @@
+/* 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";
+
+module.metadata = {
+  "stability": "experimental"
+};
+
+const { Ci } = require("chrome");
+const { open } = require("../event/dom");
+const { observe } = require("../event/chrome");
+const { filter, merge, map, expand } = require("../event/utils");
+const { windows } = require("../window/utils");
+const { events: windowEvents } = require("sdk/window/events");
+
+// Note: Please note that even though pagehide event is included
+// it's not observable reliably since it's not always triggered
+// when closing tabs. Implementation can be imrpoved once that
+// event will be necessary.
+var TYPES = ["DOMContentLoaded", "load", "pageshow", "pagehide"];
+
+var insert = observe("document-element-inserted");
+var windowCreate = merge([
+  observe("content-document-global-created"),
+  observe("chrome-document-global-created")
+]);
+var create = map(windowCreate, function({target, data, type}) {
+  return { target: target.document, type: type, data: data }
+});
+
+function streamEventsFrom({document}) {
+  // Map supported event types to a streams of those events on the given
+  // `window` for the inserted document and than merge these streams into
+  // single form stream off all window state change events.
+  let stateChanges = TYPES.map(function(type) {
+    return open(document, type, { capture: true });
+  });
+
+  // Since load events on document occur for every loded resource
+  return filter(merge(stateChanges), function({target}) {
+    return target instanceof Ci.nsIDOMDocument
+  })
+}
+exports.streamEventsFrom = streamEventsFrom;
+
+var opened = windows(null, { includePrivate: true });
+var state = merge(opened.map(streamEventsFrom));
+
+
+var futureReady = filter(windowEvents, ({type}) =>
+                                        type === "DOMContentLoaded");
+var futureWindows = map(futureReady, ({target}) => target);
+var futureState = expand(futureWindows, streamEventsFrom);
+
+exports.events = merge([insert, create, state, futureState]);
diff --git a/toolkit/jetpack/sdk/content/l10n-html.js b/toolkit/jetpack/sdk/content/l10n-html.js
new file mode 100644
index 000000000..f324623dc
--- /dev/null
+++ b/toolkit/jetpack/sdk/content/l10n-html.js
@@ -0,0 +1,133 @@
+/* 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";
+
+module.metadata = {
+  "stability": "unstable"
+};
+
+const { Ci, Cc, Cu } = require("chrome");
+const core = require("../l10n/core");
+const { loadSheet, removeSheet } = require("../stylesheet/utils");
+const { process, frames } = require("../remote/child");
+var observerService = Cc["@mozilla.org/observer-service;1"]
+                      .getService(Ci.nsIObserverService);
+const { ShimWaiver } = Cu.import("resource://gre/modules/ShimWaiver.jsm");
+const addObserver = ShimWaiver.getProperty(observerService, "addObserver");
+const removeObserver = ShimWaiver.getProperty(observerService, "removeObserver");
+
+const assetsURI = require('../self').data.url();
+
+const hideSheetUri = "data:text/css,:root {visibility: hidden !important;}";
+
+function translateElementAttributes(element) {
+  // Translateable attributes
+  const attrList = ['title', 'accesskey', 'alt', 'label', 'placeholder'];
+  const ariaAttrMap = {
+          'ariaLabel': 'aria-label',
+          'ariaValueText': 'aria-valuetext',
+          'ariaMozHint': 'aria-moz-hint'
+        };
+  const attrSeparator = '.';
+  
+  // Try to translate each of the attributes
+  for (let attribute of attrList) {
+    const data = core.get(element.dataset.l10nId + attrSeparator + attribute);
+    if (data)
+      element.setAttribute(attribute, data);
+  }
+  
+  // Look for the aria attribute translations that match fxOS's aliases
+  for (let attrAlias in ariaAttrMap) {
+    const data = core.get(element.dataset.l10nId + attrSeparator + attrAlias);
+    if (data)
+      element.setAttribute(ariaAttrMap[attrAlias], data);
+  }
+}
+
+// Taken from Gaia:
+// https://github.com/andreasgal/gaia/blob/04fde2640a7f40314643016a5a6c98bf3755f5fd/webapi.js#L1470
+function translateElement(element) {
+  element = element || document;
+
+  // check all translatable children (= w/ a `data-l10n-id' attribute)
+  var children = element.querySelectorAll('*[data-l10n-id]');
+  var elementCount = children.length;
+  for (var i = 0; i < elementCount; i++) {
+    var child = children[i];
+
+    // translate the child
+    var key = child.dataset.l10nId;
+    var data = core.get(key);
+    if (data)
+      child.textContent = data;
+
+    translateElementAttributes(child);
+  }
+}
+exports.translateElement = translateElement;
+
+function onDocumentReady2Translate(event) {
+  let document = event.target;
+  document.removeEventListener("DOMContentLoaded", onDocumentReady2Translate,
+                               false);
+
+  translateElement(document);
+
+  try {
+    // Finally display document when we finished replacing all text content
+    if (document.defaultView)
+      removeSheet(document.defaultView, hideSheetUri, 'user');
+  }
+  catch(e) {
+    console.exception(e);
+  }
+}
+
+function onContentWindow(document) {
+  // Accept only HTML documents
+  if (!(document instanceof Ci.nsIDOMHTMLDocument))
+    return;
+
+  // Bug 769483: data:URI documents instanciated with nsIDOMParser
+  // have a null `location` attribute at this time
+  if (!document.location)
+    return;
+
+  // Accept only document from this addon
+  if (document.location.href.indexOf(assetsURI) !== 0)
+    return;
+
+  try {
+    // First hide content of the document in order to have content blinking
+    // between untranslated and translated states
+    loadSheet(document.defaultView, hideSheetUri, 'user');
+  }
+  catch(e) {
+    console.exception(e);
+  }
+  // Wait for DOM tree to be built before applying localization
+  document.addEventListener("DOMContentLoaded", onDocumentReady2Translate,
+                            false);
+}
+
+// Listen to creation of content documents in order to translate them as soon
+// as possible in their loading process
+const ON_CONTENT = "document-element-inserted";
+let enabled = false;
+function enable() {
+  if (enabled)
+    return;
+  addObserver(onContentWindow, ON_CONTENT, false);
+  enabled = true;
+}
+process.port.on("sdk/l10n/html/enable", enable);
+
+function disable() {
+  if (!enabled)
+    return;
+  removeObserver(onContentWindow, ON_CONTENT);
+  enabled = false;
+}
+process.port.on("sdk/l10n/html/disable", disable);
diff --git a/toolkit/jetpack/sdk/content/loader.js b/toolkit/jetpack/sdk/content/loader.js
new file mode 100644
index 000000000..e4f0dd2aa
--- /dev/null
+++ b/toolkit/jetpack/sdk/content/loader.js
@@ -0,0 +1,74 @@
+/* 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";
+
+module.metadata = {
+  "stability": "unstable"
+};
+
+const { isValidURI, isLocalURL, URL } = require('../url');
+const { contract } = require('../util/contract');
+const { isString, isNil, instanceOf, isJSONable } = require('../lang/type');
+const { validateOptions,
+  string, array, object, either, required } = require('../deprecated/api-utils');
+
+const isValidScriptFile = (value) =>
+  (isString(value) || instanceOf(value, URL)) && isLocalURL(value);
+
+// map of property validations
+const valid = {
+  contentURL: {
+    is: either(string, object),
+    ok: url => isNil(url) || isLocalURL(url) || isValidURI(url),
+    msg: 'The `contentURL` option must be a valid URL.'
+  },
+  contentScriptFile: {
+    is: either(string, object, array),
+    ok: value => isNil(value) || [].concat(value).every(isValidScriptFile),
+    msg: 'The `contentScriptFile` option must be a local URL or an array of URLs.'
+  },
+  contentScript: {
+    is: either(string, array),
+    ok: value => isNil(value) || [].concat(value).every(isString),
+    msg: 'The `contentScript` option must be a string or an array of strings.'
+  },
+  contentScriptWhen: {
+    is: required(string),
+    map: value => value || 'end',
+    ok: value => ~['start', 'ready', 'end'].indexOf(value),
+    msg: 'The `contentScriptWhen` option must be either "start", "ready" or "end".'
+  },
+  contentScriptOptions: {
+    ok: value => isNil(value) || isJSONable(value),
+    msg: 'The contentScriptOptions should be a jsonable value.'
+  }
+};
+exports.validationAttributes = valid;
+
+/**
+ * Shortcut function to validate property with validation.
+ * @param {Object|Number|String} suspect
+ *    value to validate
+ * @param {Object} validation
+ *    validation rule passed to `api-utils`
+ */
+function validate(suspect, validation) {
+  return validateOptions(
+    { $: suspect },
+    { $: validation }
+  ).$;
+}
+
+function Allow(script) {
+  return {
+    get script() {
+      return script;
+    },
+    set script(value) {
+      script = !!value;
+    }
+  };
+}
+
+exports.contract = contract(valid);
diff --git a/toolkit/jetpack/sdk/content/mod.js b/toolkit/jetpack/sdk/content/mod.js
new file mode 100644
index 000000000..81fe9ee42
--- /dev/null
+++ b/toolkit/jetpack/sdk/content/mod.js
@@ -0,0 +1,68 @@
+/* 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";
+
+module.metadata = {
+  "stability": "experimental"
+};
+
+const { Ci } = require("chrome");
+const { dispatcher } = require("../util/dispatcher");
+const { add, remove, iterator } = require("../lang/weak-set");
+
+var getTargetWindow = dispatcher("getTargetWindow");
+
+getTargetWindow.define(function (target) {
+  if (target instanceof Ci.nsIDOMWindow)
+    return target;
+  if (target instanceof Ci.nsIDOMDocument)
+    return target.defaultView || null;
+
+  return null;
+});
+
+exports.getTargetWindow = getTargetWindow;
+
+var attachTo = dispatcher("attachTo");
+exports.attachTo = attachTo;
+
+var detachFrom = dispatcher("detatchFrom");
+exports.detachFrom = detachFrom;
+
+function attach(modification, target) {
+  if (!modification)
+    return;
+
+  let window = getTargetWindow(target);
+
+  attachTo(modification, window);
+
+  // modification are stored per content; `window` reference can still be the
+  // same even if the content is changed, therefore `document` is used instead.
+  add(modification, window.document);
+}
+exports.attach = attach;
+
+function detach(modification, target) {
+  if (!modification)
+    return;
+
+  if (target) {
+    let window = getTargetWindow(target);
+    detachFrom(modification, window);
+    remove(modification, window.document);
+  }
+  else {
+    let documents = iterator(modification);
+    for (let document of documents) {
+      let window = document.defaultView;
+      // The window might have already gone away
+      if (!window)
+        continue;
+      detachFrom(modification, document.defaultView);
+      remove(modification, document);
+    }
+  }
+}
+exports.detach = detach;
diff --git a/toolkit/jetpack/sdk/content/page-mod.js b/toolkit/jetpack/sdk/content/page-mod.js
new file mode 100644
index 000000000..8ff9b1e7b
--- /dev/null
+++ b/toolkit/jetpack/sdk/content/page-mod.js
@@ -0,0 +1,236 @@
+/* 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";
+
+module.metadata = {
+  "stability": "stable"
+};
+
+const { getAttachEventType } = require('../content/utils');
+const { Class } = require('../core/heritage');
+const { Disposable } = require('../core/disposable');
+const { WeakReference } = require('../core/reference');
+const { WorkerChild } = require('./worker-child');
+const { EventTarget } = require('../event/target');
+const { on, emit, once, setListeners } = require('../event/core');
+const { on: domOn, removeListener: domOff } = require('../dom/events');
+const { isRegExp, isUndefined } = require('../lang/type');
+const { merge } = require('../util/object');
+const { isBrowser, getFrames } = require('../window/utils');
+const { getTabs, getURI: getTabURI } = require('../tabs/utils');
+const { ignoreWindow } = require('../private-browsing/utils');
+const { Style } = require("../stylesheet/style");
+const { attach, detach } = require("../content/mod");
+const { has, hasAny } = require("../util/array");
+const { Rules } = require("../util/rules");
+const { List, addListItem, removeListItem } = require('../util/list');
+const { when } = require("../system/unload");
+const { uuid } = require('../util/uuid');
+const { frames, process } = require('../remote/child');
+
+const pagemods = new Map();
+const styles = new WeakMap();
+var styleFor = (mod) => styles.get(mod);
+
+// Helper functions
+var modMatchesURI = (mod, uri) => mod.include.matchesAny(uri) && !mod.exclude.matchesAny(uri);
+
+/**
+ * PageMod constructor (exported below).
+ * @constructor
+ */
+const ChildPageMod = Class({
+  implements: [
+    EventTarget,
+    Disposable,
+  ],
+  setup: function PageMod(model) {
+    merge(this, model);
+
+    // Set listeners on {PageMod} itself, not the underlying worker,
+    // like `onMessage`, as it'll get piped.
+    setListeners(this, model);
+
+    function deserializeRules(rules) {
+      for (let rule of rules) {
+        yield rule.type == "string" ? rule.value
+                                    : new RegExp(rule.pattern, rule.flags);
+      }
+    }
+
+    let include = [...deserializeRules(this.include)];
+    this.include = Rules();
+    this.include.add.apply(this.include, include);
+
+    let exclude = [...deserializeRules(this.exclude)];
+    this.exclude = Rules();
+    this.exclude.add.apply(this.exclude, exclude);
+
+    if (this.contentStyle || this.contentStyleFile) {
+      styles.set(this, Style({
+        uri: this.contentStyleFile,
+        source: this.contentStyle
+      }));
+    }
+
+    pagemods.set(this.id, this);
+    this.seenDocuments = new WeakMap();
+
+    // `applyOnExistingDocuments` has to be called after `pagemods.add()`
+    // otherwise its calls to `onContent` method won't do anything.
+    if (has(this.attachTo, 'existing'))
+      applyOnExistingDocuments(this);
+  },
+
+  dispose: function() {
+    let style = styleFor(this);
+    if (style)
+      detach(style);
+
+    for (let i in this.include)
+      this.include.remove(this.include[i]);
+
+    pagemods.delete(this.id);
+  }
+});
+
+function onContentWindow({ target: document }) {
+  // Return if we have no pagemods
+  if (pagemods.size === 0)
+    return;
+
+  let window = document.defaultView;
+  // XML documents don't have windows, and we don't yet support them.
+  if (!window)
+    return;
+
+  // Frame event listeners are bound to the frame the event came from by default
+  let frame = this;
+  // We apply only on documents in tabs of Firefox
+  if (!frame.isTab)
+    return;
+
+  // When the tab is private, only addons with 'private-browsing' flag in
+  // their package.json can apply content script to private documents
+  if (ignoreWindow(window))
+    return;
+
+  for (let pagemod of pagemods.values()) {
+    if (modMatchesURI(pagemod, window.location.href))
+      onContent(pagemod, window);
+  }
+}
+frames.addEventListener("DOMDocElementInserted", onContentWindow, true);
+
+function applyOnExistingDocuments (mod) {
+  for (let frame of frames) {
+    // Fake a newly created document
+    let window = frame.content;
+    // on startup with e10s, contentWindow might not exist yet,
+    // in which case we will get notified by "document-element-inserted".
+    if (!window || !window.frames)
+      return;
+    let uri = window.location.href;
+    if (has(mod.attachTo, "top") && modMatchesURI(mod, uri))
+      onContent(mod, window);
+    if (has(mod.attachTo, "frame"))
+      getFrames(window).
+        filter(iframe => modMatchesURI(mod, iframe.location.href)).
+        forEach(frame => onContent(mod, frame));
+  }
+}
+
+function createWorker(mod, window) {
+  let workerId = String(uuid());
+
+  // Instruct the parent to connect to this worker. Do this first so the parent
+  // side is connected before the worker attempts to send any messages there
+  let frame = frames.getFrameForWindow(window.top);
+  frame.port.emit('sdk/page-mod/worker-create', mod.id, {
+    id: workerId,
+    url: window.location.href
+  });
+
+  // Create a child worker and notify the parent
+  let worker = WorkerChild({
+    id: workerId,
+    window: window,
+    contentScript: mod.contentScript,
+    contentScriptFile: mod.contentScriptFile,
+    contentScriptOptions: mod.contentScriptOptions
+  });
+
+  once(worker, 'detach', () => worker.destroy());
+}
+
+function onContent (mod, window) {
+  let isTopDocument = window.top === window;
+  // Is a top level document and `top` is not set, ignore
+  if (isTopDocument && !has(mod.attachTo, "top"))
+    return;
+  // Is a frame document and `frame` is not set, ignore
+  if (!isTopDocument && !has(mod.attachTo, "frame"))
+    return;
+
+  // ensure we attach only once per document
+  let seen = mod.seenDocuments;
+  if (seen.has(window.document))
+    return;
+  seen.set(window.document, true);
+
+  let style = styleFor(mod);
+  if (style)
+    attach(style, window);
+
+  // Immediately evaluate content script if the document state is already
+  // matching contentScriptWhen expectations
+  if (isMatchingAttachState(mod, window)) {
+    createWorker(mod, window);
+    return;
+  }
+
+  let eventName = getAttachEventType(mod) || 'load';
+  domOn(window, eventName, function onReady (e) {
+    if (e.target.defaultView !== window)
+      return;
+    domOff(window, eventName, onReady, true);
+    createWorker(mod, window);
+
+    // Attaching is asynchronous so if the document is already loaded we will
+    // miss the pageshow event so send a synthetic one.
+    if (window.document.readyState == "complete") {
+      mod.on('attach', worker => {
+        try {
+          worker.send('pageshow');
+          emit(worker, 'pageshow');
+        }
+        catch (e) {
+          // This can fail if an earlier attach listener destroyed the worker
+        }
+      });
+    }
+  }, true);
+}
+
+function isMatchingAttachState (mod, window) {
+  let state = window.document.readyState;
+  return 'start' === mod.contentScriptWhen ||
+      // Is `load` event already dispatched?
+      'complete' === state ||
+      // Is DOMContentLoaded already dispatched and waiting for it?
+      ('ready' === mod.contentScriptWhen && state === 'interactive')
+}
+
+process.port.on('sdk/page-mod/create', (process, model) => {
+  if (pagemods.has(model.id))
+    return;
+
+  new ChildPageMod(model);
+});
+
+process.port.on('sdk/page-mod/destroy', (process, id) => {
+  let mod = pagemods.get(id);
+  if (mod)
+    mod.destroy();
+});
diff --git a/toolkit/jetpack/sdk/content/page-worker.js b/toolkit/jetpack/sdk/content/page-worker.js
new file mode 100644
index 000000000..e9e741120
--- /dev/null
+++ b/toolkit/jetpack/sdk/content/page-worker.js
@@ -0,0 +1,154 @@
+/* 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 { frames } = require("../remote/child");
+const { Class } = require("../core/heritage");
+const { Disposable } = require('../core/disposable');
+const { data } = require("../self");
+const { once } = require("../dom/events");
+const { getAttachEventType } = require("./utils");
+const { Rules } = require('../util/rules');
+const { uuid } = require('../util/uuid');
+const { WorkerChild } = require("./worker-child");
+const { Cc, Ci, Cu } = require("chrome");
+const { observe } = require("../event/chrome");
+const { on } = require("../event/core");
+
+const appShell = Cc["@mozilla.org/appshell/appShellService;1"].getService(Ci.nsIAppShellService);
+
+const { XPCOMUtils } = require("resource://gre/modules/XPCOMUtils.jsm");
+
+const pages = new Map();
+
+const DOC_INSERTED = "document-element-inserted";
+
+function isValidURL(page, url) {
+  return !page.rules || page.rules.matchesAny(url);
+}
+
+const ChildPage = Class({
+  implements: [ Disposable ],
+  setup: function(frame, id, options) {
+    this.id = id;
+    this.frame = frame;
+    this.options = options;
+
+    this.webNav = appShell.createWindowlessBrowser(false);
+    this.docShell.allowJavascript = this.options.allow.script;
+
+    // Accessing the browser's window forces the initial about:blank document to
+    // be created before we start listening for notifications
+    this.contentWindow;
+
+    this.webProgress.addProgressListener(this, Ci.nsIWebProgress.NOTIFY_LOCATION);
+
+    pages.set(this.id, this);
+
+    this.contentURL = options.contentURL;
+
+    if (options.include) {
+      this.rules = Rules();
+      this.rules.add.apply(this.rules, [].concat(options.include));
+    }
+  },
+
+  dispose: function() {
+    pages.delete(this.id);
+    this.webProgress.removeProgressListener(this);
+    this.webNav.close();
+    this.webNav = null;
+  },
+
+  attachWorker: function() {
+    if (!isValidURL(this, this.contentWindow.location.href))
+      return;
+
+    this.options.id = uuid().toString();
+    this.options.window = this.contentWindow;
+    this.frame.port.emit("sdk/frame/connect", this.id, {
+      id: this.options.id,
+      url: this.contentWindow.document.documentURIObject.spec
+    });
+    new WorkerChild(this.options);
+  },
+
+  get docShell() {
+    return this.webNav.QueryInterface(Ci.nsIInterfaceRequestor)
+                      .getInterface(Ci.nsIDocShell);
+  },
+
+  get webProgress() {
+    return this.docShell.QueryInterface(Ci.nsIInterfaceRequestor)
+                        .getInterface(Ci.nsIWebProgress);
+  },
+
+  get contentWindow() {
+    return this.docShell.QueryInterface(Ci.nsIInterfaceRequestor)
+                        .getInterface(Ci.nsIDOMWindow);
+  },
+
+  get contentURL() {
+    return this.options.contentURL;
+  },
+  set contentURL(url) {
+    this.options.contentURL = url;
+
+    url = this.options.contentURL ? data.url(this.options.contentURL) : "about:blank";
+    this.webNav.loadURI(url, Ci.nsIWebNavigation.LOAD_FLAGS_NONE, null, null, null);
+  },
+
+  onLocationChange: function(progress, request, location, flags) {
+    // Ignore inner-frame events
+    if (progress != this.webProgress)
+      return;
+    // Ignore events that don't change the document
+    if (flags & Ci.nsIWebProgressListener.LOCATION_CHANGE_SAME_DOCUMENT)
+      return;
+
+    let event = getAttachEventType(this.options);
+    // Attaching at the start of the load is handled by the
+    // document-element-inserted listener.
+    if (event == DOC_INSERTED)
+      return;
+
+    once(this.contentWindow, event, () => {
+      this.attachWorker();
+    }, false);
+  },
+
+  QueryInterface: XPCOMUtils.generateQI(["nsIWebProgressListener", "nsISupportsWeakReference"])
+});
+
+on(observe(DOC_INSERTED), "data", ({ target }) => {
+  let page = Array.from(pages.values()).find(p => p.contentWindow.document === target);
+  if (!page)
+    return;
+
+  if (getAttachEventType(page.options) == DOC_INSERTED)
+    page.attachWorker();
+});
+
+frames.port.on("sdk/frame/create", (frame, id, options) => {
+  new ChildPage(frame, id, options);
+});
+
+frames.port.on("sdk/frame/set", (frame, id, params) => {
+  let page = pages.get(id);
+  if (!page)
+    return;
+
+  if ("allowScript" in params)
+    page.docShell.allowJavascript = params.allowScript;
+  if ("contentURL" in params)
+    page.contentURL = params.contentURL;
+});
+
+frames.port.on("sdk/frame/destroy", (frame, id) => {
+  let page = pages.get(id);
+  if (!page)
+    return;
+
+  page.destroy();
+});
diff --git a/toolkit/jetpack/sdk/content/sandbox.js b/toolkit/jetpack/sdk/content/sandbox.js
new file mode 100644
index 000000000..096ba5c87
--- /dev/null
+++ b/toolkit/jetpack/sdk/content/sandbox.js
@@ -0,0 +1,426 @@
+/* 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';
+
+module.metadata = {
+  'stability': 'unstable'
+};
+
+const { Class } = require('../core/heritage');
+const { EventTarget } = require('../event/target');
+const { on, off, emit } = require('../event/core');
+const { events } = require('./sandbox/events');
+const { requiresAddonGlobal } = require('./utils');
+const { delay: async } = require('../lang/functional');
+const { Ci, Cu, Cc } = require('chrome');
+const timer = require('../timers');
+const { URL } = require('../url');
+const { sandbox, evaluate, load } = require('../loader/sandbox');
+const { merge } = require('../util/object');
+const { getTabForContentWindowNoShim } = require('../tabs/utils');
+const { getInnerId } = require('../window/utils');
+const { PlainTextConsole } = require('../console/plain-text');
+const { data } = require('../self');const { isChildLoader } = require('../remote/core');
+// WeakMap of sandboxes so we can access private values
+const sandboxes = new WeakMap();
+
+/* Trick the linker in order to ensure shipping these files in the XPI.
+  require('./content-worker.js');
+  Then, retrieve URL of these files in the XPI:
+*/
+var prefix = module.uri.split('sandbox.js')[0];
+const CONTENT_WORKER_URL = prefix + 'content-worker.js';
+const metadata = require('@loader/options').metadata;
+
+// Fetch additional list of domains to authorize access to for each content
+// script. It is stored in manifest `metadata` field which contains
+// package.json data. This list is originaly defined by authors in
+// `permissions` attribute of their package.json addon file.
+const permissions = (metadata && metadata['permissions']) || {};
+const EXPANDED_PRINCIPALS = permissions['cross-domain-content'] || [];
+
+const waiveSecurityMembrane = !!permissions['unsafe-content-script'];
+
+const nsIScriptSecurityManager = Ci.nsIScriptSecurityManager;
+const secMan = Cc["@mozilla.org/scriptsecuritymanager;1"].
+  getService(Ci.nsIScriptSecurityManager);
+
+const JS_VERSION = '1.8';
+
+// Tests whether this window is loaded in a tab
+function isWindowInTab(window) {
+  if (isChildLoader) {
+    let { frames } = require('../remote/child');
+    let frame = frames.getFrameForWindow(window.top);
+    return frame && frame.isTab;
+  }
+  else {
+    // The deprecated sync worker API still does everything in the main process
+    return getTabForContentWindowNoShim(window);
+  }
+}
+
+const WorkerSandbox = Class({
+  implements: [ EventTarget ],
+
+  /**
+   * Emit a message to the worker content sandbox
+   */
+  emit: function emit(type, ...args) {
+    // JSON.stringify is buggy with cross-sandbox values,
+    // it may return "{}" on functions. Use a replacer to match them correctly.
+    let replacer = (k, v) =>
+      typeof(v) === "function"
+        ? (type === "console" ? Function.toString.call(v) : void(0))
+        : v;
+
+    // Ensure having an asynchronous behavior
+    async(() =>
+      emitToContent(this, JSON.stringify([type, ...args], replacer))
+    );
+  },
+
+  /**
+   * Synchronous version of `emit`.
+   * /!\ Should only be used when it is strictly mandatory /!\
+   *     Doesn't ensure passing only JSON values.
+   *     Mainly used by context-menu in order to avoid breaking it.
+   */
+  emitSync: function emitSync(...args) {
+    // because the arguments could be also non JSONable values,
+    // we need to ensure the array instance is created from
+    // the content's sandbox
+    return emitToContent(this, new modelFor(this).sandbox.Array(...args));
+  },
+
+  /**
+   * Configures sandbox and loads content scripts into it.
+   * @param {Worker} worker
+   *    content worker
+   */
+  initialize: function WorkerSandbox(worker, window) {
+    let model = {};
+    sandboxes.set(this, model);
+    model.worker = worker;
+    // We receive a wrapped window, that may be an xraywrapper if it's content
+    let proto = window;
+
+    // TODO necessary?
+    // Ensure that `emit` has always the right `this`
+    this.emit = this.emit.bind(this);
+    this.emitSync = this.emitSync.bind(this);
+
+    // Use expanded principal for content-script if the content is a
+    // regular web content for better isolation.
+    // (This behavior can be turned off for now with the unsafe-content-script
+    // flag to give addon developers time for making the necessary changes)
+    // But prevent it when the Worker isn't used for a content script but for
+    // injecting `addon` object into a Panel scope, for example.
+    // That's because:
+    // 1/ It is useless to use multiple domains as the worker is only used
+    // to communicate with the addon,
+    // 2/ By using it it would prevent the document to have access to any JS
+    // value of the worker. As JS values coming from multiple domain principals
+    // can't be accessed by 'mono-principals' (principal with only one domain).
+    // Even if this principal is for a domain that is specified in the multiple
+    // domain principal.
+    let principals = window;
+    let wantGlobalProperties = [];
+    let isSystemPrincipal = secMan.isSystemPrincipal(
+      window.document.nodePrincipal);
+    if (!isSystemPrincipal && !requiresAddonGlobal(worker)) {
+      if (EXPANDED_PRINCIPALS.length > 0) {
+        // We have to replace XHR constructor of the content document
+        // with a custom cross origin one, automagically added by platform code:
+        delete proto.XMLHttpRequest;
+        wantGlobalProperties.push('XMLHttpRequest');
+      }
+      if (!waiveSecurityMembrane)
+        principals = EXPANDED_PRINCIPALS.concat(window);
+    }
+
+    // Create the sandbox and bind it to window in order for content scripts to
+    // have access to all standard globals (window, document, ...)
+    let content = sandbox(principals, {
+      sandboxPrototype: proto,
+      wantXrays: !requiresAddonGlobal(worker),
+      wantGlobalProperties: wantGlobalProperties,
+      wantExportHelpers: true,
+      sameZoneAs: window,
+      metadata: {
+        SDKContentScript: true,
+        'inner-window-id': getInnerId(window)
+      }
+    });
+    model.sandbox = content;
+
+    // We have to ensure that window.top and window.parent are the exact same
+    // object than window object, i.e. the sandbox global object. But not
+    // always, in case of iframes, top and parent are another window object.
+    let top = window.top === window ? content : content.top;
+    let parent = window.parent === window ? content : content.parent;
+    merge(content, {
+      // We need 'this === window === top' to be true in toplevel scope:
+      get window() {
+        return content;
+      },
+      get top() {
+        return top;
+      },
+      get parent() {
+        return parent;
+      }
+    });
+
+    // Use the Greasemonkey naming convention to provide access to the
+    // unwrapped window object so the content script can access document
+    // JavaScript values.
+    // NOTE: this functionality is experimental and may change or go away
+    // at any time!
+    //
+    // Note that because waivers aren't propagated between origins, we
+    // need the unsafeWindow getter to live in the sandbox.
+    var unsafeWindowGetter =
+      new content.Function('return window.wrappedJSObject || window;');
+    Object.defineProperty(content, 'unsafeWindow', {get: unsafeWindowGetter});
+
+    // Load trusted code that will inject content script API.
+    let ContentWorker = load(content, CONTENT_WORKER_URL);
+
+    // prepare a clean `self.options`
+    let options = 'contentScriptOptions' in worker ?
+      JSON.stringify(worker.contentScriptOptions) :
+      undefined;
+
+    // Then call `inject` method and communicate with this script
+    // by trading two methods that allow to send events to the other side:
+    //   - `onEvent` called by content script
+    //   - `result.emitToContent` called by addon script
+    let onEvent = Cu.exportFunction(onContentEvent.bind(null, this), ContentWorker);
+    let chromeAPI = createChromeAPI(ContentWorker);
+    let result = Cu.waiveXrays(ContentWorker).inject(content, chromeAPI, onEvent, options);
+
+    // Merge `emitToContent` into our private model of the
+    // WorkerSandbox so we can communicate with content script
+    model.emitToContent = result;
+
+    let console = new PlainTextConsole(null, getInnerId(window));
+
+    // Handle messages send by this script:
+    setListeners(this, console);
+
+    // Inject `addon` global into target document if document is trusted,
+    // `addon` in document is equivalent to `self` in content script.
+    if (requiresAddonGlobal(worker)) {
+      Object.defineProperty(getUnsafeWindow(window), 'addon', {
+          value: content.self,
+          configurable: true
+        }
+      );
+    }
+
+    // Inject our `console` into target document if worker doesn't have a tab
+    // (e.g Panel, PageWorker).
+    // `worker.tab` can't be used because bug 804935.
+    if (!isWindowInTab(window)) {
+      let win = getUnsafeWindow(window);
+
+      // export our chrome console to content window, as described here:
+      // https://developer.mozilla.org/en-US/docs/Components.utils.createObjectIn
+      let con = Cu.createObjectIn(win);
+
+      let genPropDesc = function genPropDesc(fun) {
+        return { enumerable: true, configurable: true, writable: true,
+          value: console[fun] };
+      }
+
+      const properties = {
+        log: genPropDesc('log'),
+        info: genPropDesc('info'),
+        warn: genPropDesc('warn'),
+        error: genPropDesc('error'),
+        debug: genPropDesc('debug'),
+        trace: genPropDesc('trace'),
+        dir: genPropDesc('dir'),
+        group: genPropDesc('group'),
+        groupCollapsed: genPropDesc('groupCollapsed'),
+        groupEnd: genPropDesc('groupEnd'),
+        time: genPropDesc('time'),
+        timeEnd: genPropDesc('timeEnd'),
+        profile: genPropDesc('profile'),
+        profileEnd: genPropDesc('profileEnd'),
+        exception: genPropDesc('exception'),
+        assert: genPropDesc('assert'),
+        count: genPropDesc('count'),
+        table: genPropDesc('table'),
+        clear: genPropDesc('clear'),
+        dirxml: genPropDesc('dirxml'),
+        markTimeline: genPropDesc('markTimeline'),
+        timeline: genPropDesc('timeline'),
+        timelineEnd: genPropDesc('timelineEnd'),
+        timeStamp: genPropDesc('timeStamp'),
+      };
+
+      Object.defineProperties(con, properties);
+      Cu.makeObjectPropsNormal(con);
+
+      win.console = con;
+    };
+
+    emit(events, "content-script-before-inserted", {
+      window: window,
+      worker: worker
+    });
+
+    // The order of `contentScriptFile` and `contentScript` evaluation is
+    // intentional, so programs can load libraries like jQuery from script URLs
+    // and use them in scripts.
+    let contentScriptFile = ('contentScriptFile' in worker)
+          ? worker.contentScriptFile
+          : null,
+        contentScript = ('contentScript' in worker)
+          ? worker.contentScript
+          : null;
+
+    if (contentScriptFile)
+      importScripts.apply(null, [this].concat(contentScriptFile));
+
+    if (contentScript) {
+      evaluateIn(
+        this,
+        Array.isArray(contentScript) ? contentScript.join(';\n') : contentScript
+      );
+    }
+  },
+  destroy: function destroy(reason) {
+    if (typeof reason != 'string')
+      reason = '';
+    this.emitSync('event', 'detach', reason);
+    let model = modelFor(this);
+    model.sandbox = null
+    model.worker = null;
+  },
+
+});
+
+exports.WorkerSandbox = WorkerSandbox;
+
+/**
+ * Imports scripts to the sandbox by reading files under urls and
+ * evaluating its source. If exception occurs during evaluation
+ * `'error'` event is emitted on the worker.
+ * This is actually an analog to the `importScript` method in web
+ * workers but in our case it's not exposed even though content
+ * scripts may be able to do it synchronously since IO operation
+ * takes place in the UI process.
+ */
+function importScripts (workerSandbox, ...urls) {
+  let { worker, sandbox } = modelFor(workerSandbox);
+  for (let i in urls) {
+    let contentScriptFile = data.url(urls[i]);
+
+    try {
+      let uri = URL(contentScriptFile);
+      if (uri.scheme === 'resource')
+        load(sandbox, String(uri));
+      else
+        throw Error('Unsupported `contentScriptFile` url: ' + String(uri));
+    }
+    catch(e) {
+      emit(worker, 'error', e);
+    }
+  }
+}
+
+function setListeners (workerSandbox, console) {
+  let { worker } = modelFor(workerSandbox);
+  // console.xxx calls
+  workerSandbox.on('console', function consoleListener (kind, ...args) {
+    console[kind].apply(console, args);
+  });
+
+  // self.postMessage calls
+  workerSandbox.on('message', function postMessage(data) {
+    // destroyed?
+    if (worker)
+      emit(worker, 'message', data);
+  });
+
+  // self.port.emit calls
+  workerSandbox.on('event', function portEmit (...eventArgs) {
+    // If not destroyed, emit event information to worker
+    // `eventArgs` has the event name as first element,
+    // and remaining elements are additional arguments to pass
+    if (worker)
+      emit.apply(null, [worker.port].concat(eventArgs));
+  });
+
+  // unwrap, recreate and propagate async Errors thrown from content-script
+  workerSandbox.on('error', function onError({instanceOfError, value}) {
+    if (worker) {
+      let error = value;
+      if (instanceOfError) {
+        error = new Error(value.message, value.fileName, value.lineNumber);
+        error.stack = value.stack;
+        error.name = value.name;
+      }
+      emit(worker, 'error', error);
+    }
+  });
+}
+
+/**
+ * Evaluates code in the sandbox.
+ * @param {String} code
+ *    JavaScript source to evaluate.
+ * @param {String} [filename='javascript:' + code]
+ *    Name of the file
+ */
+function evaluateIn (workerSandbox, code, filename) {
+  let { worker, sandbox } = modelFor(workerSandbox);
+  try {
+    evaluate(sandbox, code, filename || 'javascript:' + code);
+  }
+  catch(e) {
+    emit(worker, 'error', e);
+  }
+}
+
+/**
+ * Method called by the worker sandbox when it needs to send a message
+ */
+function onContentEvent (workerSandbox, args) {
+  // As `emit`, we ensure having an asynchronous behavior
+  async(function () {
+    // We emit event to chrome/addon listeners
+    emit.apply(null, [workerSandbox].concat(JSON.parse(args)));
+  });
+}
+
+
+function modelFor (workerSandbox) {
+  return sandboxes.get(workerSandbox);
+}
+
+function getUnsafeWindow (win) {
+  return win.wrappedJSObject || win;
+}
+
+function emitToContent (workerSandbox, args) {
+  return modelFor(workerSandbox).emitToContent(args);
+}
+
+function createChromeAPI (scope) {
+  return Cu.cloneInto({
+    timers: {
+      setTimeout: timer.setTimeout.bind(timer),
+      setInterval: timer.setInterval.bind(timer),
+      clearTimeout: timer.clearTimeout.bind(timer),
+      clearInterval: timer.clearInterval.bind(timer),
+    },
+    sandbox: {
+      evaluate: evaluate,
+    },
+  }, scope, {cloneFunctions: true});
+}
diff --git a/toolkit/jetpack/sdk/content/sandbox/events.js b/toolkit/jetpack/sdk/content/sandbox/events.js
new file mode 100644
index 000000000..d6f7eb004
--- /dev/null
+++ b/toolkit/jetpack/sdk/content/sandbox/events.js
@@ -0,0 +1,12 @@
+/* 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";
+
+module.metadata = {
+  "stability": "experimental"
+};
+
+const events = {};
+exports.events = events;
diff --git a/toolkit/jetpack/sdk/content/tab-events.js b/toolkit/jetpack/sdk/content/tab-events.js
new file mode 100644
index 000000000..9e244a853
--- /dev/null
+++ b/toolkit/jetpack/sdk/content/tab-events.js
@@ -0,0 +1,58 @@
+/* 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 { Ci } = require('chrome');
+const system = require('sdk/system/events');
+const { frames } = require('sdk/remote/child');
+const { WorkerChild } = require('sdk/content/worker-child');
+
+// map observer topics to tab event names
+const EVENTS = {
+  'content-document-global-created': 'create',
+  'chrome-document-global-created': 'create',
+  'content-document-interactive': 'ready',
+  'chrome-document-interactive': 'ready',
+  'content-document-loaded': 'load',
+  'chrome-document-loaded': 'load',
+// 'content-page-shown': 'pageshow', // bug 1024105
+}
+
+function topicListener({ subject, type }) {
+  // NOTE detect the window from the subject:
+  // - on *-global-created the subject is the window
+  // - in the other cases it is the document object
+  let window = subject instanceof Ci.nsIDOMWindow ? subject : subject.defaultView;
+  if (!window){
+    return;
+  }
+  let frame = frames.getFrameForWindow(window);
+  if (frame) {
+    let readyState = frame.content.document.readyState;
+    frame.port.emit('sdk/tab/event', EVENTS[type], { readyState });
+  }
+}
+
+for (let topic in EVENTS)
+  system.on(topic, topicListener, true);
+
+// bug 1024105 - content-page-shown notification doesn't pass persisted param
+function eventListener({target, type, persisted}) {
+  let frame = this;
+  if (target === frame.content.document) {
+    frame.port.emit('sdk/tab/event', type, persisted);
+  }
+}
+frames.addEventListener('pageshow', eventListener, true);
+
+frames.port.on('sdk/tab/attach', (frame, options) => {
+  options.window = frame.content;
+  new WorkerChild(options);
+});
+
+// Forward the existent frames's readyState.
+for (let frame of frames) {
+  let readyState = frame.content.document.readyState;
+  frame.port.emit('sdk/tab/event', 'init', { readyState });
+}
diff --git a/toolkit/jetpack/sdk/content/thumbnail.js b/toolkit/jetpack/sdk/content/thumbnail.js
new file mode 100644
index 000000000..783615fc6
--- /dev/null
+++ b/toolkit/jetpack/sdk/content/thumbnail.js
@@ -0,0 +1,51 @@
+/* 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';
+
+module.metadata = {
+  'stability': 'unstable'
+};
+
+const { Cc, Ci, Cu } = require('chrome');
+const AppShellService = Cc['@mozilla.org/appshell/appShellService;1'].
+                        getService(Ci.nsIAppShellService);
+
+const NS = 'http://www.w3.org/1999/xhtml';
+const COLOR = 'rgb(255,255,255)';
+
+/**
+ * Creates canvas element with a thumbnail of the passed window.
+ * @param {Window} window
+ * @returns {Element}
+ */
+function getThumbnailCanvasForWindow(window) {
+  let aspectRatio = 0.5625; // 16:9
+  let thumbnail = AppShellService.hiddenDOMWindow.document
+                    .createElementNS(NS, 'canvas');
+  thumbnail.mozOpaque = true;
+  thumbnail.width = Math.ceil(window.screen.availWidth / 5.75);
+  thumbnail.height = Math.round(thumbnail.width * aspectRatio);
+  let ctx = thumbnail.getContext('2d');
+  let snippetWidth = window.innerWidth * .6;
+  let scale = thumbnail.width / snippetWidth;
+  ctx.scale(scale, scale);
+  ctx.drawWindow(window, window.scrollX, window.scrollY, snippetWidth,
+                snippetWidth * aspectRatio, COLOR);
+  return thumbnail;
+}
+exports.getThumbnailCanvasForWindow = getThumbnailCanvasForWindow;
+
+/**
+ * Creates Base64 encoded data URI of the thumbnail for the passed window.
+ * @param {Window} window
+ * @returns {String}
+ */
+exports.getThumbnailURIForWindow = function getThumbnailURIForWindow(window) {
+  return getThumbnailCanvasForWindow(window).toDataURL()
+};
+
+// default 80x45 blank when not available
+exports.BLANK = 'data:image/png;base64,' +
+  'iVBORw0KGgoAAAANSUhEUgAAAFAAAAAtCAYAAAA5reyyAAAAJElEQVRoge3BAQ'+
+  'EAAACCIP+vbkhAAQAAAAAAAAAAAAAAAADXBjhtAAGQ0AF/AAAAAElFTkSuQmCC';
diff --git a/toolkit/jetpack/sdk/content/utils.js b/toolkit/jetpack/sdk/content/utils.js
new file mode 100644
index 000000000..90995a614
--- /dev/null
+++ b/toolkit/jetpack/sdk/content/utils.js
@@ -0,0 +1,105 @@
+/* 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';
+
+module.metadata = {
+  'stability': 'unstable'
+};
+
+var { merge } = require('../util/object');
+var { data } = require('../self');
+var assetsURI = data.url();
+var isArray = Array.isArray;
+var method = require('../../method/core');
+var { uuid } = require('../util/uuid');
+
+const isAddonContent = ({ contentURL }) =>
+  contentURL && data.url(contentURL).startsWith(assetsURI);
+
+exports.isAddonContent = isAddonContent;
+
+function hasContentScript({ contentScript, contentScriptFile }) {
+  return (isArray(contentScript) ? contentScript.length > 0 :
+         !!contentScript) ||
+         (isArray(contentScriptFile) ? contentScriptFile.length > 0 :
+         !!contentScriptFile);
+}
+exports.hasContentScript = hasContentScript;
+
+function requiresAddonGlobal(model) {
+  return model.injectInDocument || (isAddonContent(model) && !hasContentScript(model));
+}
+exports.requiresAddonGlobal = requiresAddonGlobal;
+
+function getAttachEventType(model) {
+  if (!model) return null;
+  let when = model.contentScriptWhen;
+  return requiresAddonGlobal(model) ? 'document-element-inserted' :
+         when === 'start' ? 'document-element-inserted' :
+         when === 'ready' ? 'DOMContentLoaded' :
+         when === 'end' ? 'load' :
+         null;
+}
+exports.getAttachEventType = getAttachEventType;
+
+var attach = method('worker-attach');
+exports.attach = attach;
+
+var connect = method('worker-connect');
+exports.connect = connect;
+
+var detach = method('worker-detach');
+exports.detach = detach;
+
+var destroy = method('worker-destroy');
+exports.destroy = destroy;
+
+function WorkerHost (workerFor) {
+  // Define worker properties that just proxy to underlying worker
+  return ['postMessage', 'port', 'url', 'tab'].reduce(function(proto, name) {
+    // Use descriptor properties instead so we can call
+    // the worker function in the context of the worker so we
+    // don't have to create new functions with `fn.bind(worker)`
+    let descriptorProp = {
+      value: function (...args) {
+        let worker = workerFor(this);
+        return worker[name].apply(worker, args);
+      }
+    };
+    
+    let accessorProp = {
+      get: function () { return workerFor(this)[name]; },
+      set: function (value) { workerFor(this)[name] = value; }
+    };
+
+    Object.defineProperty(proto, name, merge({
+      enumerable: true,
+      configurable: false,
+    }, isDescriptor(name) ? descriptorProp : accessorProp));
+    return proto;
+  }, {});
+  
+  function isDescriptor (prop) {
+    return ~['postMessage'].indexOf(prop);
+  }
+}
+exports.WorkerHost = WorkerHost;
+
+function makeChildOptions(options) {
+  function makeStringArray(arrayOrValue) {
+    if (!arrayOrValue)
+      return [];
+    return [].concat(arrayOrValue).map(String);
+  }
+
+  return {
+    id: String(uuid()),
+    contentScript: makeStringArray(options.contentScript),
+    contentScriptFile: makeStringArray(options.contentScriptFile),
+    contentScriptOptions: options.contentScriptOptions ?
+                          JSON.stringify(options.contentScriptOptions) :
+                          null,
+  }
+}
+exports.makeChildOptions = makeChildOptions;
diff --git a/toolkit/jetpack/sdk/content/worker-child.js b/toolkit/jetpack/sdk/content/worker-child.js
new file mode 100644
index 000000000..dbf65a933
--- /dev/null
+++ b/toolkit/jetpack/sdk/content/worker-child.js
@@ -0,0 +1,158 @@
+/* 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 { merge } = require('../util/object');
+const { Class } = require('../core/heritage');
+const { emit } = require('../event/core');
+const { EventTarget } = require('../event/target');
+const { getInnerId, getByInnerId } = require('../window/utils');
+const { instanceOf, isObject } = require('../lang/type');
+const system = require('../system/events');
+const { when } = require('../system/unload');
+const { WorkerSandbox } = require('./sandbox');
+const { Ci } = require('chrome');
+const { process, frames } = require('../remote/child');
+
+const EVENTS = {
+  'chrome-page-shown': 'pageshow',
+  'content-page-shown': 'pageshow',
+  'chrome-page-hidden': 'pagehide',
+  'content-page-hidden': 'pagehide',
+  'inner-window-destroyed': 'detach',
+}
+
+// The parent Worker must have been created (or an async message sent to spawn
+// its creation) before creating the WorkerChild or messages from the content
+// script to the parent will get lost.
+const WorkerChild = Class({
+  implements: [EventTarget],
+
+  initialize(options) {
+    merge(this, options);
+    keepAlive.set(this.id, this);
+
+    this.windowId = getInnerId(this.window);
+    if (this.contentScriptOptions)
+      this.contentScriptOptions = JSON.parse(this.contentScriptOptions);
+
+    this.port = EventTarget();
+    this.port.on('*', this.send.bind(this, 'event'));
+    this.on('*', this.send.bind(this));
+
+    this.observe = this.observe.bind(this);
+
+    for (let topic in EVENTS)
+      system.on(topic, this.observe);
+
+    this.receive = this.receive.bind(this);
+    process.port.on('sdk/worker/message', this.receive);
+
+    this.sandbox = WorkerSandbox(this, this.window);
+
+    // If the document has an unexpected readyState, its worker-child instance is initialized
+    // as frozen until one of the known readyState is reached.
+    let initialDocumentReadyState = this.window.document.readyState;
+    this.frozen = [
+      "loading", "interactive", "complete"
+    ].includes(initialDocumentReadyState) ? false : true;
+
+    if (this.frozen) {
+      console.warn("SDK worker-child started as frozen on unexpected initial document.readyState", {
+        initialDocumentReadyState, windowLocation: this.window.location.href,
+      });
+    }
+
+    this.frozenMessages = [];
+    this.on('pageshow', () => {
+      this.frozen = false;
+      this.frozenMessages.forEach(args => this.sandbox.emit(...args));
+      this.frozenMessages = [];
+    });
+    this.on('pagehide', () => {
+      this.frozen = true;
+    });
+  },
+
+  // messages
+  receive(process, id, args) {
+    if (id !== this.id)
+      return;
+    args = JSON.parse(args);
+
+    if (this.frozen)
+      this.frozenMessages.push(args);
+    else
+      this.sandbox.emit(...args);
+
+    if (args[0] === 'detach')
+      this.destroy(args[1]);
+  },
+
+  send(...args) {
+    process.port.emit('sdk/worker/event', this.id, JSON.stringify(args, exceptions));
+  },
+
+  // notifications
+  observe({ type, subject }) {
+    if (!this.sandbox)
+      return;
+
+    if (subject.defaultView && getInnerId(subject.defaultView) === this.windowId) {
+      this.sandbox.emitSync(EVENTS[type]);
+      emit(this, EVENTS[type]);
+    }
+
+    if (type === 'inner-window-destroyed' &&
+        subject.QueryInterface(Ci.nsISupportsPRUint64).data === this.windowId) {
+      this.destroy();
+    }
+  },
+
+  get frame() {
+    return frames.getFrameForWindow(this.window.top);
+  },
+
+  // detach/destroy: unload and release the sandbox
+  destroy(reason) {
+    if (!this.sandbox)
+      return;
+
+    for (let topic in EVENTS)
+      system.off(topic, this.observe);
+    process.port.off('sdk/worker/message', this.receive);
+
+    this.sandbox.destroy(reason);
+    this.sandbox = null;
+    keepAlive.delete(this.id);
+
+    this.send('detach');
+  }
+})
+exports.WorkerChild = WorkerChild;
+
+// Error instances JSON poorly
+function exceptions(key, value) {
+  if (!isObject(value) || !instanceOf(value, Error))
+    return value;
+  let _errorType = value.constructor.name;
+  let { message, fileName, lineNumber, stack, name } = value;
+  return { _errorType, message, fileName, lineNumber, stack, name };
+}
+
+// workers for windows in this tab
+var keepAlive = new Map();
+
+process.port.on('sdk/worker/create', (process, options, cpows) => {
+  options.window = cpows.window;
+  let worker = new WorkerChild(options);
+
+  let frame = frames.getFrameForWindow(options.window.top);
+  frame.port.emit('sdk/worker/connect', options.id, options.window.location.href);
+});
+
+when(reason => {
+  for (let worker of keepAlive.values())
+    worker.destroy(reason);
+});
diff --git a/toolkit/jetpack/sdk/content/worker.js b/toolkit/jetpack/sdk/content/worker.js
new file mode 100644
index 000000000..39b940a88
--- /dev/null
+++ b/toolkit/jetpack/sdk/content/worker.js
@@ -0,0 +1,180 @@
+/* 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";
+
+module.metadata = {
+  "stability": "unstable"
+};
+
+const { emit } = require('../event/core');
+const { omit, merge } = require('../util/object');
+const { Class } = require('../core/heritage');
+const { method } = require('../lang/functional');
+const { getInnerId } = require('../window/utils');
+const { EventTarget } = require('../event/target');
+const { isPrivate } = require('../private-browsing/utils');
+const { getTabForBrowser, getTabForContentWindowNoShim, getBrowserForTab } = require('../tabs/utils');
+const { attach, connect, detach, destroy, makeChildOptions } = require('./utils');
+const { ensure } = require('../system/unload');
+const { on: observe } = require('../system/events');
+const { Ci, Cu } = require('chrome');
+const { modelFor: tabFor } = require('sdk/model/core');
+const { remoteRequire, processes, frames } = require('../remote/parent');
+remoteRequire('sdk/content/worker-child');
+
+const workers = new WeakMap();
+var modelFor = (worker) => workers.get(worker);
+
+const ERR_DESTROYED = "Couldn't find the worker to receive this message. " +
+  "The script may not be initialized yet, or may already have been unloaded.";
+
+// a handle for communication between content script and addon code
+const Worker = Class({
+  implements: [EventTarget],
+
+  initialize(options = {}) {
+    ensure(this, 'detach');
+
+    let model = {
+      attached: false,
+      destroyed: false,
+      earlyEvents: [],        // fired before worker was attached
+      frozen: true,           // document is not yet active
+      options,
+    };
+    workers.set(this, model);
+
+    this.on('detach', this.detach);
+    EventTarget.prototype.initialize.call(this, options);
+
+    this.receive = this.receive.bind(this);
+
+    this.port = EventTarget();
+    this.port.emit = this.send.bind(this, 'event');
+    this.postMessage = this.send.bind(this, 'message');
+
+    if ('window' in options) {
+      let window = options.window;
+      delete options.window;
+      attach(this, window);
+    }
+  },
+
+  // messages
+  receive(process, id, args) {
+    let model = modelFor(this);
+    if (id !== model.id || !model.attached)
+      return;
+    args = JSON.parse(args);
+    if (model.destroyed && args[0] != 'detach')
+      return;
+
+    if (args[0] === 'event')
+      emit(this.port, ...args.slice(1))
+    else
+      emit(this, ...args);
+  },
+
+  send(...args) {
+    let model = modelFor(this);
+    if (model.destroyed && args[0] !== 'detach')
+      throw new Error(ERR_DESTROYED);
+
+    if (!model.attached) {
+      model.earlyEvents.push(args);
+      return;
+    }
+
+    processes.port.emit('sdk/worker/message', model.id, JSON.stringify(args));
+  },
+
+  // properties
+  get url() {
+    let { url } = modelFor(this);
+    return url;
+  },
+
+  get contentURL() {
+    return this.url;
+  },
+
+  get tab() {
+    require('sdk/tabs');
+    let { frame } = modelFor(this);
+    if (!frame)
+      return null;
+    let rawTab = getTabForBrowser(frame.frameElement);
+    return rawTab && tabFor(rawTab);
+  },
+
+  toString: () => '[object Worker]',
+
+  detach: method(detach),
+  destroy: method(destroy),
+})
+exports.Worker = Worker;
+
+attach.define(Worker, function(worker, window) {
+  let model = modelFor(worker);
+  if (model.attached)
+    detach(worker);
+
+  let childOptions = makeChildOptions(model.options);
+  processes.port.emitCPOW('sdk/worker/create', [childOptions], { window });
+
+  let listener = (frame, id, url) => {
+    if (id != childOptions.id)
+      return;
+    frames.port.off('sdk/worker/connect', listener);
+    connect(worker, frame, { id, url });
+  };
+  frames.port.on('sdk/worker/connect', listener);
+});
+
+connect.define(Worker, function(worker, frame, { id, url }) {
+  let model = modelFor(worker);
+  if (model.attached)
+    detach(worker);
+
+  model.id = id;
+  model.frame = frame;
+  model.url = url;
+
+  // Messages from content -> chrome come through the process message manager
+  // since that lives longer than the frame message manager
+  processes.port.on('sdk/worker/event', worker.receive);
+
+  model.attached = true;
+  model.destroyed = false;
+  model.frozen = false;
+
+  model.earlyEvents.forEach(args => worker.send(...args));
+  model.earlyEvents = [];
+  emit(worker, 'attach');
+});
+
+// unload and release the child worker, release window reference
+detach.define(Worker, function(worker) {
+  let model = modelFor(worker);
+  if (!model.attached)
+    return;
+
+  processes.port.off('sdk/worker/event', worker.receive);
+  model.attached = false;
+  model.destroyed = true;
+  emit(worker, 'detach');
+});
+
+isPrivate.define(Worker, ({ tab }) => isPrivate(tab));
+
+// Something in the parent side has destroyed the worker, tell the child to
+// detach, the child will respond when it has detached
+destroy.define(Worker, function(worker, reason) {
+  let model = modelFor(worker);
+  model.destroyed = true;
+  if (!model.attached)
+    return;
+
+  worker.send('detach', reason);
+});