gecko-dev/tools/quitter/background.js

/* 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/. */

"use strict";

/* eslint-env webextensions */

browser.runtime.onMessage.addListener(msg => {
  if (msg === "quit") {
    browser.quitter.quit();
  }
});