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diff --git a/tools/addon-sdk-1.3/packages/api-utils/lib/utils/thumbnail.js b/tools/addon-sdk-1.3/packages/api-utils/lib/utils/thumbnail.js
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--- a/tools/addon-sdk-1.3/packages/api-utils/lib/utils/thumbnail.js
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-/* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is Jetpack.
- *
- * The Initial Developer of the Original Code is
- * the Mozilla Foundation.
- * Portions created by the Initial Developer are Copyright (C) 2010
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- * Irakli Gozalishvili <gozala@mozilla.com> (Original Author)
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either the GNU General Public License Version 2 or later (the "GPL"), or
- * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
-
-"use strict";
-
-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()
-};