The Tor Browser / file revision

 /* 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/. */

 // Test that we can link with libxul using js-ctypes

 const {Cu} = require("chrome");

 const {ctypes} = Cu.import("resource://gre/modules/ctypes.jsm", {});

 const {OS} = Cu.import("resource://gre/modules/osfile.jsm", {});

 exports.test = function(assert) {

   let path = OS.Constants.Path.libxul;

   assert.pass("libxul is at " + path);

   let lib = ctypes.open(path);

   assert.ok(lib != null, "linked to libxul successfully");

 };

 require('test').run(exports);