Issue 5028 - Use browser namespace

options.js

Index: options.js
===================================================================
--- a/options.js
+++ b/options.js
@@ -12,24 +12,31 @@
  * 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;
 };
 
-chrome.runtime.sendMessage({
+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");