text: var frameLoadsPending = 2;
  
  var callMasterFrame = true;
  var testDone = false;
  
  var masterFrameOrigin = "";
  var slaveFrameOrigin = "";
  
  var failureRegExp = new RegExp("^FAILURE");
  var todoRegExp = new RegExp("^TODO");
  
  const framePath = "/tests/dom/tests/mochitest/storageevent/";
  
  window.addEventListener("message", onMessageReceived, false);
  
  function onMessageReceived(event)
  {
    netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
  
    switch (event.data)
    {
      // Indication of the frame onload event
      case "frame loaded":
        if (--frameLoadsPending)
          break;
  
        // Just fall through...
  
      // Indication of successfully finished step of a test
      case "perf":
        if (callMasterFrame)
          masterFrame.postMessage("step", masterFrameOrigin);
        else if (slaveFrame)
          slaveFrame.postMessage("step", slaveFrameOrigin);
        else if (masterFrame.slaveFrame)
          masterFrame.slaveFrame.postMessage("step", slaveFrameOrigin);
        callMasterFrame = !callMasterFrame;
        break;
  
      // Indication of all test parts finish (from any of the frames)
      case "done":
        if (testDone)
          break;
  
        testDone = true;
        SimpleTest.finish();
        break;
  
      // Any other message indicates error, succes or todo message of a test
      default:
        if (typeof event.data == "undefined")
          break; // XXXkhuey this receives undefined values
                 // (which used to become empty strings) on occasion ...
        if (event.data.match(todoRegExp))
          SimpleTest.todo(false, event.data);
        else
          SimpleTest.ok(!event.data.match(failureRegExp), event.data);
        break;
    }
  }
  