diff --git a/extensions/help/resources/content/help.xul b/extensions/help/resources/content/help.xul
index 50759dfa91ac..b534a14ff08c 100644
--- a/extensions/help/resources/content/help.xul
+++ b/extensions/help/resources/content/help.xul
@@ -75,7 +75,7 @@
 
   <!-- button bar -->
   <toolbox id="help-toolbox" class="toolbox-top" deferattached="true">
-    <toolbar id="helpToolbar" class="toolbar-primary"
+    <toolbar id="helpToolbar" class="toolbar-primary chromeclass-toolbar"
         grippytooltiptext="&toolbar.tooltip;"
         tbalign="stretch" persist="collapsed">