The Tor Browser / file revision

 /**

  * Any copyright is dedicated to the Public Domain.

  * http://creativecommons.org/publicdomain/zero/1.0/

  */

 if (!("ctypes" in self)) {

   throw "No ctypes!";

 }

 // Go ahead and verify that the ctypes lazy getter actually works.

 if (ctypes.toString() != "[object ctypes]") {

   throw "Bad ctypes object: " + ctypes.toString();

 }

 onmessage = function(event) {

   let worker = new ChromeWorker("chromeWorker_subworker.js");

   worker.onmessage = function(event) {

     postMessage(event.data);

   }

   worker.postMessage(event.data);

 }