diff --git a/xpfe/appshell/src/nsWebShellWindow.cpp b/xpfe/appshell/src/nsWebShellWindow.cpp
index 1c0553f1d552..5e05e775736e 100644
--- a/xpfe/appshell/src/nsWebShellWindow.cpp
+++ b/xpfe/appshell/src/nsWebShellWindow.cpp
@@ -928,6 +928,14 @@ nsWebShellWindow::ConvertWebShellToDOMWindow(nsIWebShell* aShell, nsIDOMWindow**
   return NS_OK;
 }
 
+NS_IMETHODIMP
+nsWebShellWindow::CreatePopup(nsIDOMElement* aElement, nsIDOMElement* aPopupContent, 
+                              PRInt32 aXPos, PRInt32 aYPos, 
+                              const nsString& aPopupType, const nsString& aPopupAlignment)
+{
+  return NS_OK;
+}
+
 NS_IMETHODIMP
 nsWebShellWindow::ContentShellAdded(nsIWebShell* aChildShell, nsIContent* frameNode)
 {
diff --git a/xpfe/appshell/src/nsWebShellWindow.h b/xpfe/appshell/src/nsWebShellWindow.h
index 52153c83cef0..5438e1bd37b5 100644
--- a/xpfe/appshell/src/nsWebShellWindow.h
+++ b/xpfe/appshell/src/nsWebShellWindow.h
@@ -84,6 +84,10 @@ public:
                         PRInt32 aStatus);
 
 
+  NS_IMETHOD CreatePopup(nsIDOMElement* aElement, nsIDOMElement* aPopupContent, 
+                         PRInt32 aXPos, PRInt32 aYPos, 
+                         const nsString& aPopupType, const nsString& aPopupAlignment);
+
   NS_IMETHOD ContentShellAdded(nsIWebShell* aChildShell, nsIContent* frameNode);
 
   NS_IMETHOD NewWebShell(PRUint32 aChromeMask,