The Tor Browser / file revision

 #if 0

 /* This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 #endif

 XPCOMUtils.defineLazyModuleGetter(this, "console",

   "resource://gre/modules/devtools/Console.jsm");

 let gDebug = false;

 try {

   gDebug = Services.prefs.getBoolPref(kPrefCustomizationDebug);

 } catch (e) {}

 function LOG(...args) {

   if (gDebug) {

     args.unshift(gModuleName);

     console.log.apply(console, args);

   }

 }

 function ERROR(...args) {

   args.unshift(gModuleName);

   console.error.apply(console, args);

 }

 function INFO(...args) {

   args.unshift(gModuleName);

   console.info.apply(console, args);

 }