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diff --git a/tools/addon-sdk-1.12/lib/sdk/window/utils.js b/tools/addon-sdk-1.12/lib/sdk/window/utils.js
new file mode 100644
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+++ b/tools/addon-sdk-1.12/lib/sdk/window/utils.js
@@ -0,0 +1,205 @@
+/* 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 } = require('chrome');
+const array = require('../util/array');
+
+const windowWatcher = Cc['@mozilla.org/embedcomp/window-watcher;1'].
+                       getService(Ci.nsIWindowWatcher);
+const appShellService = Cc['@mozilla.org/appshell/appShellService;1'].
+                        getService(Ci.nsIAppShellService);
+const observers = require('../deprecated/observer-service');
+const WM = Cc['@mozilla.org/appshell/window-mediator;1'].
+           getService(Ci.nsIWindowMediator);
+
+const BROWSER = 'navigator:browser',
+      URI_BROWSER = 'chrome://browser/content/browser.xul',
+      NAME = '_blank',
+      FEATURES = 'chrome,all,dialog=no';
+
+function getMostRecentBrowserWindow() {
+  return WM.getMostRecentWindow(BROWSER);
+}
+exports.getMostRecentBrowserWindow = getMostRecentBrowserWindow;
+
+/**
+ * Returns the ID of the window's current inner window.
+ */
+function getInnerId(window) {
+  return window.QueryInterface(Ci.nsIInterfaceRequestor).
+                getInterface(Ci.nsIDOMWindowUtils).currentInnerWindowID;
+};
+exports.getInnerId = getInnerId;
+
+/**
+ * Returns the ID of the window's outer window.
+ */
+function getOuterId(window) {
+  return window.QueryInterface(Ci.nsIInterfaceRequestor).
+                getInterface(Ci.nsIDOMWindowUtils).outerWindowID;
+};
+exports.getOuterId = getOuterId;
+
+/**
+ * Returns `nsIXULWindow` for the given `nsIDOMWindow`.
+ */
+function getXULWindow(window) {
+  return window.QueryInterface(Ci.nsIInterfaceRequestor).
+    getInterface(Ci.nsIWebNavigation).
+    QueryInterface(Ci.nsIDocShellTreeItem).
+    treeOwner.QueryInterface(Ci.nsIInterfaceRequestor).
+    getInterface(Ci.nsIXULWindow);
+};
+exports.getXULWindow = getXULWindow;
+
+/**
+ * Returns `nsIBaseWindow` for the given `nsIDOMWindow`.
+ */
+function getBaseWindow(window) {
+  return window.QueryInterface(Ci.nsIInterfaceRequestor).
+    getInterface(Ci.nsIWebNavigation).
+    QueryInterface(Ci.nsIDocShell).
+    QueryInterface(Ci.nsIDocShellTreeItem).
+    treeOwner.
+    QueryInterface(Ci.nsIBaseWindow);
+}
+exports.getBaseWindow = getBaseWindow;
+
+function getWindowDocShell(window) window.gBrowser.docShell;
+exports.getWindowDocShell = getWindowDocShell;
+
+function getWindowLoadingContext(window) {
+  return getWindowDocShell(window).
+         QueryInterface(Ci.nsILoadContext);
+}
+exports.getWindowLoadingContext = getWindowLoadingContext;
+
+/**
+ * Removes given window from the application's window registry. Unless
+ * `options.close` is `false` window is automatically closed on application
+ * quit.
+ * @params {nsIDOMWindow} window
+ * @params {Boolean} options.close
+ */
+function backgroundify(window, options) {
+  let base = getBaseWindow(window);
+  base.visibility = false;
+  base.enabled = false;
+  appShellService.unregisterTopLevelWindow(getXULWindow(window));
+  if (!options || options.close !== false)
+    observers.add('quit-application-granted', window.close.bind(window));
+
+  return window;
+}
+exports.backgroundify = backgroundify;
+
+/**
+ * Takes hash of options and serializes it to a features string that
+ * can be used passed to `window.open`. For more details on features string see:
+ * https://developer.mozilla.org/en/DOM/window.open#Position_and_size_features
+ */
+function serializeFeatures(options) {
+  return Object.keys(options).reduce(function(result, name) {
+    let value = options[name];
+    return result + ',' + name + '=' +
+           (value === true ? 'yes' : value === false ? 'no' : value);
+  }, '').substr(1);
+}
+
+/**
+ * Opens a top level window and returns it's `nsIDOMWindow` representation.
+ * @params {String} uri
+ *    URI of the document to be loaded into window.
+ * @params {nsIDOMWindow} options.parent
+ *    Used as parent for the created window.
+ * @params {String} options.name
+ *    Optional name that is assigned to the window.
+ * @params {Object} options.features
+ *    Map of key, values like: `{ width: 10, height: 15, chrome: true }`.
+ */
+function open(uri, options) {
+  options = options || {};
+  return windowWatcher.
+    openWindow(options.parent || null,
+               uri,
+               options.name || null,
+               serializeFeatures(options.features || {}),
+               options.args || null);
+}
+exports.open = open;
+
+/**
+ * Opens a top level window and returns it's `nsIDOMWindow` representation.
+ * Same as `open` but with more features
+ * @param {Object} options
+ * 
+ */
+function openDialog(options) {
+  options = options || {};
+
+  let browser = WM.getMostRecentWindow(BROWSER);
+  return browser.openDialog.apply(
+      browser, 
+      array.flatten([
+        options.url || URI_BROWSER,
+        options.name || '_blank',
+        options.features || 'chrome,all,dialog=no',
+        options.args || null
+      ])
+  );
+}
+exports.openDialog = openDialog;
+
+/**
+ * Returns an array of all currently opened windows.
+ * Note that these windows may still be loading.
+ */
+function windows() {
+  let list = [];
+  let winEnum = windowWatcher.getWindowEnumerator();
+  while (winEnum.hasMoreElements()) {
+    let window = winEnum.getNext().QueryInterface(Ci.nsIDOMWindow);
+    list.push(window);
+  }
+  return list;
+}
+exports.windows = windows;
+
+/**
+ * Check if the given window is completely loaded.
+ * i.e. if its "load" event has already been fired and all possible DOM content
+ * is done loading (the whole DOM document, images content, ...)
+ * @params {nsIDOMWindow} window
+ */
+function isDocumentLoaded(window) {
+  return window.document.readyState == "complete";
+}
+exports.isDocumentLoaded = isDocumentLoaded;
+
+function isBrowser(window) {
+  return window.document.documentElement.getAttribute("windowtype") === BROWSER;
+};
+exports.isBrowser = isBrowser;
+
+function getWindowTitle(window) {
+  return window && window.document ? window.document.title : null;
+}
+exports.getWindowTitle = getWindowTitle;
+
+function isXULBrowser(window) {
+  return !!(isBrowser(window) && window.XULBrowserWindow);
+}
+exports.isXULBrowser = isXULBrowser;
+
+function getFrames(window) {
+  return Array.slice(window.frames).reduce(function(frames, frame) {
+    return frames.concat(frame, getFrames(frame))
+  }, [])
+}
+exports.getFrames = getFrames;