diff -r 000000000000 -r 6474c204b198 addon-sdk/source/lib/sdk/windows/dom.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/addon-sdk/source/lib/sdk/windows/dom.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,37 @@
+/* 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 { Trait } = require('../deprecated/traits');
+const { isWindowPrivate, getWindowTitle } = require('../window/utils');
+const { deprecateUsage } = require('../util/deprecate');
+
+module.metadata = {
+  "stability": "unstable"
+};
+
+const WindowDom = Trait.compose({
+  _window: Trait.required,
+  get title() {
+    return getWindowTitle(this._window);
+  },
+  close: function close() {
+    let window = this._window;
+    if (window) window.close();
+    return this._public;
+  },
+  activate: function activate() {
+    let window = this._window;
+    if (window) window.focus();
+    return this._public;
+  },
+  get isPrivateBrowsing() {
+    deprecateUsage('`browserWindow.isPrivateBrowsing` is deprecated, please ' +
+                   'consider using ' +
+                   '`require("sdk/private-browsing").isPrivate(browserWindow)` ' +
+                   'instead.');
+    return isWindowPrivate(this._window);
+  }
+});
+exports.WindowDom = WindowDom;