browser_freeze_builtins.js

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/* 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/.

*/

function checkCtor(global, name, description) {

  ok(Object.isFrozen(global[name]), `${description} ${name} is frozen`);

ok(

    Object.isSealed(global[name].prototype),

    `${description} ${name}.prototype is sealed`

);

  let descr = Object.getOwnPropertyDescriptor(global, name);

  ok(!descr.configurable, `${description} ${name} should be non-configurable`);

  ok(!descr.writable, `${description} ${name} should not be writable`);

function checkGlobal(global, description) {

  checkCtor(global, "Object", description);

  checkCtor(global, "Array", description);

  checkCtor(global, "Function", description);

add_task(async function () {

  let systemGlobal = Cu.getGlobalForObject(Services);

  checkGlobal(systemGlobal, "system global");

});