diff --git a/dom/public/idl/xul/nsIDOMXULContainerElement.idl b/dom/public/idl/xul/nsIDOMXULContainerElement.idl
index 0fb59a0dfb0b..6c9656e16fc0 100755
--- a/dom/public/idl/xul/nsIDOMXULContainerElement.idl
+++ b/dom/public/idl/xul/nsIDOMXULContainerElement.idl
@@ -37,9 +37,19 @@
  * ***** END LICENSE BLOCK ***** */
 
 #include "nsIDOMXULElement.idl"
+interface nsIDOMXULContainerElement;
 
-[scriptable, uuid(edfeaf37-3b24-4466-af7a-b3851044f1c1)]
-interface nsIDOMXULContainerElement : nsIDOMXULElement
+[scriptable, uuid(4650e55f-4777-4271-8b62-9603a7dd4614)]
+interface nsIDOMXULContainerItemElement : nsIDOMXULElement
+{
+  /**
+   * Returns the parent container if any.
+   */
+  readonly attribute nsIDOMXULContainerElement parentContainer;
+};
+
+[scriptable, uuid(bc07c626-4294-43ae-9b0a-e726de0adcad)]
+interface nsIDOMXULContainerElement : nsIDOMXULContainerItemElement
 {
   /**
    * Creates an item for the given label and value and appends it to the
@@ -87,9 +97,5 @@ interface nsIDOMXULContainerElement : nsIDOMXULElement
    * @param aIndex - the index of the item to return
    */
   nsIDOMXULElement getItemAtIndex(in long aIndex);
-
-  /**
-   * Returns the parent container if any.
-   */
-  readonly attribute nsIDOMXULElement parentContainer;
 };
+
diff --git a/toolkit/content/widgets/menu.xml b/toolkit/content/widgets/menu.xml
index 993fcdf07057..79b4e82b3140 100644
--- a/toolkit/content/widgets/menu.xml
+++ b/toolkit/content/widgets/menu.xml
@@ -15,7 +15,8 @@
     <resources>
       <stylesheet src="chrome://global/skin/menu.css"/>
     </resources>
-    <implementation implements="nsIDOMXULSelectControlItemElement, nsIAccessibleProvider">
+    <implementation implements="nsIDOMXULSelectControlItemElement, nsIDOMXULContainerItemElement, nsIAccessibleProvider">
+      <!-- nsIAccessibleProvider -->
       <property name="accessibleType" readonly="true">
         <getter>
           <![CDATA[
@@ -25,6 +26,8 @@
           ]]>
         </getter>
       </property>
+
+      <!-- nsIDOMXULSelectControlItemElement -->
       <property name="selected" readonly="true"
                 onget="return this.getAttribute('selected') == 'true';"/>
       <property name="control" readonly="true">
@@ -38,6 +41,17 @@
           ]]>
         </getter>
       </property>
+
+      <!-- nsIDOMXULContainerItemElement -->
+      <property name="parentContainer" readonly="true">
+        <getter>
+          for (var parent = this.parentNode; parent; parent = parent.parentNode) {
+            if (parent instanceof Components.interfaces.nsIDOMXULContainerElement)
+              return parent;
+          }
+          return null;
+        </getter>
+      </property>
     </implementation>
   </binding>
 
@@ -141,16 +155,6 @@
         </body>
       </method>
 
-      <property name="parentContainer" readonly="true">
-        <getter>
-          for (var parent = this.parentNode; parent; parent = parent.parentNode) {
-            if (parent instanceof Components.interfaces.nsIDOMXULContainerElement)
-              return parent;
-          }
-          return null;
-        </getter>
-      </property>
-
       <property name="menupopup" readonly="true">
         <getter>
         <![CDATA[