diff --git a/browser/base/content/browser.xul b/browser/base/content/browser.xul
index d256ff374b9b..06d17688f4a2 100644
--- a/browser/base/content/browser.xul
+++ b/browser/base/content/browser.xul
@@ -726,7 +726,7 @@
               <menu class="split-menuitem-menu"
                     label="&preferencesCmd.label;">
                 <menupopup id="appmenu_customizeMenu"
-                           onpopupshowing="onViewToolbarsPopupShowing(event, document.getElementById('appmenu_preferences').nextSibling.nextSibling);">
+                           onpopupshowing="onViewToolbarsPopupShowing(event, document.getElementById('appmenu_toggleTabsOnTop').previousSibling);">
                   <menuitem id="appmenu_preferences"
 #ifdef XP_UNIX
                             label="&preferencesCmdUnix.label;"