The Tor Browser / file revision

 /* Any copyright is dedicated to the Public Domain.

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

 "use strict";

 const Cc = Components.classes;

 const Ci = Components.interfaces;

 const Cu = Components.utils;

 const Cr = Components.results;

 function testGlobal(aName) {

   let systemPrincipal = Cc["@mozilla.org/systemprincipal;1"]

     .createInstance(Ci.nsIPrincipal);

   let sandbox = Cu.Sandbox(systemPrincipal);

   Cu.evalInSandbox("this.__name = '" + aName + "'", sandbox);

   return sandbox;

 }