--- a/suite/browser/test/browser/browser_bug462289.js
+++ b/suite/browser/test/browser/browser_bug462289.js
@@ -1,11 +1,11 @@
 // Wanted delay (in ms) to let UI fully update.
-// 250: hopefully enough (on slow test environments).
-var gDelay = 250;
+// 375: hopefully enough (on slow test environments).
+var gDelay = 375;
 
 var tab1, tab2;
 
 function focus_in_navbar()
 {
   var parent = document.activeElement.parentNode;
   while (parent && parent.id != "nav-bar")
     parent = parent.parentNode;