The following license applies to all files (except crashrecovery.js):

/* ***** 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 the Session Manager extension.
 *
 * The Initial Developer of the Original Code is
 * Morac (http://sessionmanager.mozdev.org/).
 * Portions created by the Initial Developer are Copyright (C) 2007
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * * Zeniko (Original Author)
 * * Danil Ivanov (Cache Fixer)
 * * dougeeebear (Session Manager icon)
 *   &
 * - BabelZilla translators:
 * * Andrea (Italian)
 * * Rick Cart (Chinese [zh-CN])
 * * Teboga (Portuguese)
 * * jojaba (French)
 * * Edgaras Janušauskas (Lithuanian)
 * * Proyecto Nave (Spanish)
 * * Leszek (teo) Życzkowski (Polish)
 * * Haebaru (Japanese)
 * * stoneflash (Russian)
 * * JW_00000 (Dutch)
 * * Ossipoff (Danish)
 * * SerdarSahin (Turkish)
 * * Wladow (Slovak)
 * * Team erweiterungen.de, ReinekeFux (German)
 * * Mikes Kaszmán István (Cashman) (Hungarian)
 * * Kape123 (Serbian)
 * * lloco (Portuguese)
 * * PetrTwo (Czech)
 * * Kenmooda (Finish)
 * * Ivan Jonoski (Macedonian)
 * * Elapsem (Korean)
 *
 * 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 ***** */

For the license to crashrecovery.js see
jar:http://www.haslo.ch/zeniko/software/crashrecovery.xpi!/license.txt