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) {

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

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

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

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

   }

 }