diff --git a/content/xul/document/src/nsXULDocument.h b/content/xul/document/src/nsXULDocument.h
index 9f8344bfbcf..7ed90e89049 100644
--- a/content/xul/document/src/nsXULDocument.h
+++ b/content/xul/document/src/nsXULDocument.h
@@ -323,19 +323,6 @@ protected:
 
     PRUint32 mPendingSheets;
 
-    /*
-     * XXX dr
-     * ------
-     * We used to have two pointers into the content model: mPopupNode and
-     * mTooltipNode, which were used to retrieve the objects triggering a
-     * popup or tooltip. You need that access because your reference has
-     * disappeared by the time you click on a popup item or do whatever
-     * with a tooltip. These were owning references (no cycles, as pinkerton
-     * pointed out, since we're still parent-child).
-     */
-
-    nsCOMPtr<nsIDOMNode>    mTooltipNode;          // [OWNER] element triggering the tooltip
-
     /**
      * document lightweight theme for use with :-moz-lwtheme, :-moz-lwtheme-brighttext
      * and :-moz-lwtheme-darktext