The Tor Browser / file revision

 /* 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";

 /**

  * Session Storage and Restoration

  *

  * Overview

  * This service keeps track of a user's session, storing the various bits

  * required to return the browser to its current state. The relevant data is

  * stored in memory, and is periodically saved to disk in a file in the

  * profile directory. The service is started at first window load, in

  * delayedStartup, and will restore the session from the data received from

  * the nsSessionStartup service.

  */

 const Cu = Components.utils;

 const Ci = Components.interfaces;

 Cu.import("resource://gre/modules/XPCOMUtils.jsm");

 Cu.import("resource:///modules/sessionstore/SessionStore.jsm");

 function SessionStoreService() {}

 // The SessionStore module's object is frozen. We need to modify our prototype

 // and add some properties so let's just copy the SessionStore object.

 Object.keys(SessionStore).forEach(function (aName) {

   let desc = Object.getOwnPropertyDescriptor(SessionStore, aName);

   Object.defineProperty(SessionStoreService.prototype, aName, desc);

 });

 SessionStoreService.prototype.classID =

   Components.ID("{5280606b-2510-4fe0-97ef-9b5a22eafe6b}");

 SessionStoreService.prototype.QueryInterface =

   XPCOMUtils.generateQI([Ci.nsISessionStore]);

 this.NSGetFactory = XPCOMUtils.generateNSGetFactory([SessionStoreService]);