diff --git a/mozilla/webshell/public/nsILinkHandler.h b/mozilla/webshell/public/nsILinkHandler.h
index c9d5a147de8..16c1d17f8cd 100644
--- a/mozilla/webshell/public/nsILinkHandler.h
+++ b/mozilla/webshell/public/nsILinkHandler.h
@@ -58,6 +58,17 @@ public:
                          const nsString& aTargetSpec,
                          nsIPostData* aPostData = 0) = 0;
 
+  /**
+   * Process a mouse-over a link. aFrame is the frame that contains the
+   * linked content. aURLSpec is an absolute url spec that defines the
+   * destination for the link. aTargetSpec indicates where the link is
+   * targeted (it may be an empty string).
+   */
+  NS_IMETHOD OnOverLink(nsIFrame* aFrame, 
+                        const nsString& aURLSpec,
+                        const nsString& aTargetSpec,
+                        nsIPostData* aPostData = 0) = 0;
+
   /**
    * Get the state of a link to a given absolute URL
    */