diff -r 000000000000 -r 6474c204b198 addon-sdk/source/lib/sdk/window/browser.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/addon-sdk/source/lib/sdk/window/browser.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,55 @@
+/* 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 { windowNS } = require('./namespace');
+const { on, off, once } = require('../event/core');
+const { method } = require('../lang/functional');
+const { getWindowTitle } = require('./utils');
+const unload = require('../system/unload');
+const { isWindowPrivate } = require('../window/utils');
+const { EventTarget } = require('../event/target');
+const { getOwnerWindow: getPBOwnerWindow } = require('../private-browsing/window/utils');
+const { viewFor } = require('../view/core');
+const { deprecateUsage } = require('../util/deprecate');
+
+const ERR_FENNEC_MSG = 'This method is not yet supported by Fennec, consider using require("sdk/tabs") instead';
+
+const BrowserWindow = Class({
+  initialize: function initialize(options) {
+    EventTarget.prototype.initialize.call(this, options);
+    windowNS(this).window = options.window;
+  },
+  activate: function activate() {
+    // TODO
+    return null;
+  },
+  close: function() {
+    throw new Error(ERR_FENNEC_MSG);
+    return null;
+  },
+  get title() getWindowTitle(windowNS(this).window),
+  // NOTE: Fennec only has one window, which is assumed below
+  // TODO: remove assumption below
+  // NOTE: tabs requires windows
+  get tabs() require('../tabs'),
+  get activeTab() require('../tabs').activeTab,
+  on: method(on),
+  removeListener: method(off),
+  once: method(once),
+  get isPrivateBrowsing() {
+    deprecateUsage('`browserWindow.isPrivateBrowsing` is deprecated, please ' +
+                 'consider using ' +
+                 '`require("sdk/private-browsing").isPrivate(browserWindow)` ' +
+                 'instead.');
+    return isWindowPrivate(windowNS(this).window);
+  }
+});
+exports.BrowserWindow = BrowserWindow;
+
+const getWindowView = window => windowNS(window).window;
+
+getPBOwnerWindow.define(BrowserWindow, getWindowView);
+viewFor.define(BrowserWindow, getWindowView);