Bug 1391117 - Prevent nsBrowserGlue's initialization tasks from running twice in case its notification is sent again. r=mikedeboer

MozReview-Commit-ID: Id5A5UoUbeA

--HG--
extra : rebase_source : 206b6dab1a86c3b9836648f43f9ba8ddf358a05d

browser/components/nsBrowserGlue.js

@@ -1018,6 +1018,11 @@ BrowserGlue.prototype = {
 
   // All initial windows have opened.
   _onWindowsRestored: function BG__onWindowsRestored() {
+    if (this._windowsWereRestored) {
+      return;
+    }
+    this._windowsWereRestored = true;
+
     BrowserUsageTelemetry.init();
     BrowserUITelemetry.init();