Issue 5315 - Add support for Microsoft Edge

ext/common.js

Index: ext/common.js
===================================================================
--- a/ext/common.js
+++ b/ext/common.js
@@ -19,6 +19,11 @@
 
 (function()
 {
+  // Both Edge and Mozilla Web Extensions use
+  // the namespace 'browser' instead of 'chrome'
+  if (typeof browser != "undefined")
+    window.chrome = window.browser;

[Sebastian Noack, 2017/06/07 14:42:14]

Firefox actually has the "chrome" namespace as well, and we use it there, but it
has some minor inconsistencies with "browser". So this change would potentially
change behavior on Firefox.

At some point we should, use "browser" everywhere (and alias "chrome" to
"browser for Chrome). But for now, to keep this change as simple and as least
intrusive as possible, just check for the absence of "chrome" instead.

[Oleksandr, 2017/06/14 03:41:01]

There is actually a `chrome` object defined in Edge. It has only one property
'app' and nothing else. I don't know what it is for, but I think it wouldn't
hurt preserving it.

+
   window.ext = {};
 
   let EventTarget = ext._EventTarget = function()