The Tor Browser / file revision

 const Ci = Components.interfaces;

 const Cc = Components.classes;

 function isParentProcess() {

     let appInfo = Cc["@mozilla.org/xre/app-info;1"];

     return (!appInfo || appInfo.getService(Ci.nsIXULRuntime).processType == Ci.nsIXULRuntime.PROCESS_TYPE_DEFAULT);

 }

 function run_test() {

   if (isParentProcess() == false) {

     do_load_child_test_harness();

     var pb = Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefBranch);

     pb.setBoolPref("Test.IPC.bool.new", true);

     pb.setIntPref("Test.IPC.int.new", 23);

     pb.setCharPref("Test.IPC.char.new", "hey");

     run_test_in_child("test_observed_prefs.js");

   }

 }