--- a/toolkit/content/widgets/browser.xml
+++ b/toolkit/content/widgets/browser.xml
@@ -46,16 +46,19 @@
   %findBarDTD;
 ]>
 
 <bindings id="browserBindings"
           xmlns="http://www.mozilla.org/xbl"
           xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
 
   <binding id="browser" extends="xul:browser">
+    <content clickthrough="never">
+      <children/>
+    </content>
     <implementation type="application/javascript" implements="nsIAccessibleProvider, nsIObserver, nsIDOMEventListener">
       <property name="accessibleType" readonly="true">
         <getter>
           <![CDATA[
             return Components.interfaces.nsIAccessibleProvider.OuterDoc;
           ]]>
         </getter>
       </property>