Bug 1776021 - Increased length of test timeout.r=pbz

Differential Revision: https://phabricator.services.mozilla.com/D192753

browser/base/content/test/popups/browser_popup_blocker_iframes.js

@@ -4,7 +4,7 @@
 
 "use strict";
 
-requestLongerTimeout(2);
+requestLongerTimeout(5);
 
 const testURL = getRootDirectory(gTestPath).replace(
   "chrome://mochitests/content",