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/. */

 let stateBackup = ss.getBrowserState();

 function test() {

   /** Test for bug 581593 **/

   waitForExplicitFinish();

   ignoreAllUncaughtExceptions();

   let oldState = { windows: [{ tabs: [{ entries: [{ url: "example.com" }] }] }]};

   let pageData = {

     url: "about:sessionrestore",

     formdata: { id: { "sessionData": "(" + JSON.stringify(oldState) + ")" } }

   };

   let state = { windows: [{ tabs: [{ entries: [pageData] }] }] };

   // The form data will be restored before SSTabRestored, so we want to listen

   // for that on the currently selected tab (it will be reused)

   gBrowser.selectedTab.addEventListener("SSTabRestored", onSSTabRestored, true);

   ss.setBrowserState(JSON.stringify(state));

 }

 function onSSTabRestored(aEvent) {

   info("SSTabRestored event");

   gBrowser.selectedTab.removeEventListener("SSTabRestored", onSSTabRestored, true);

   // This is an ok way to check this because we will make sure that the text

   // field is parsable.

   let val = gBrowser.selectedBrowser.contentDocument.getElementById("sessionData").value;

   try {

     JSON.parse(val);

     ok(true, "JSON.parse succeeded");

   }

   catch (e) {

     ok(false, "JSON.parse failed");

   }

   cleanup();

 }

 function cleanup() {

   ss.setBrowserState(stateBackup);

   executeSoon(finish);

 }