diff --git a/browser/base/content/test/popups/browser_popup_blocker_iframes.js b/browser/base/content/test/popups/browser_popup_blocker_iframes.js
index aa93a7acacbe..9ba2425ae086 100644
--- a/browser/base/content/test/popups/browser_popup_blocker_iframes.js
+++ b/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",