Issue 5028 - Use browser namespace

options.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 "use strict";
 
-// Both Edge and Mozilla Web Extensions use the namespace
-// 'browser' instead of 'chrome'. Edge has chrome namespace defined,
-// in some cases, but only with one property: 'app'.
-if (typeof browser == "undefined" ||
-    typeof chrome != "undefined" && typeof chrome.extension != "undefined")
-  window.browser = chrome;
-
 let iframe = document.getElementById("content");
 
 iframe.onload = () =>
 {
   document.title = iframe.contentDocument.title;
 };
 
 browser.runtime.sendMessage({
   type: "app.get",
   what: "application"
 },
 application =>
 {
   // Load the mobile version of the options page on Firefox for Android.
   iframe.src = iframe.getAttribute("data-src-" + application) ||
                iframe.getAttribute("data-src");
 });