diff --git a/xpfe/appshell/src/nsChromeTreeOwner.cpp b/xpfe/appshell/src/nsChromeTreeOwner.cpp
index 61000f3f6a61..942abef8b1d1 100644
--- a/xpfe/appshell/src/nsChromeTreeOwner.cpp
+++ b/xpfe/appshell/src/nsChromeTreeOwner.cpp
@@ -61,6 +61,7 @@ NS_INTERFACE_MAP_BEGIN(nsChromeTreeOwner)
    NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDocShellTreeOwner)
    NS_INTERFACE_MAP_ENTRY(nsIDocShellTreeOwner)
    NS_INTERFACE_MAP_ENTRY(nsIBaseWindow)
+   NS_INTERFACE_MAP_ENTRY(nsIWebProgressListener)
    NS_INTERFACE_MAP_ENTRY(nsIInterfaceRequestor)
 NS_INTERFACE_MAP_END
 
@@ -312,6 +313,42 @@ NS_IMETHODIMP nsChromeTreeOwner::SetTitle(const PRUnichar* aTitle)
    return mXULWindow->nsXULWindow::SetTitle(aTitle);
 }
 
+//*****************************************************************************
+// nsChromeTreeOwner::nsIWebProgressListener
+//*****************************************************************************   
+
+NS_IMETHODIMP nsChromeTreeOwner::OnProgressChange(nsIChannel* aChannel,
+   PRInt32 aCurSelfProgress, PRInt32 aMaxSelfProgress, 
+   PRInt32 aCurTotalProgress, PRInt32 aMaxTotalProgress)
+{
+   return NS_OK;
+}
+
+NS_IMETHODIMP nsChromeTreeOwner::OnChildProgressChange(nsIChannel* aChannel,
+   PRInt32 aCurChildProgress, PRInt32 aMaxChildProgress)
+{
+   return NS_OK;   
+}
+
+NS_IMETHODIMP nsChromeTreeOwner::OnStatusChange(nsIChannel* aChannel,
+   PRInt32 aProgressStatusFlags)
+{
+   return NS_OK;
+}
+
+NS_IMETHODIMP nsChromeTreeOwner::OnChildStatusChange(nsIChannel* aChannel,
+   PRInt32 aProgressStatusFlags)
+{
+   return NS_OK;
+}
+
+NS_IMETHODIMP nsChromeTreeOwner::OnLocationChange(nsIURI* aLocation)
+{
+   // If loading a new root .xul document, then redo chrome.
+   mXULWindow->mChromeLoaded = PR_FALSE;
+   return NS_OK;
+}
+
 //*****************************************************************************
 // nsChromeTreeOwner: Helpers
 //*****************************************************************************   
diff --git a/xpfe/appshell/src/nsChromeTreeOwner.h b/xpfe/appshell/src/nsChromeTreeOwner.h
index a4dc132d4290..f769d87add6d 100644
--- a/xpfe/appshell/src/nsChromeTreeOwner.h
+++ b/xpfe/appshell/src/nsChromeTreeOwner.h
@@ -30,12 +30,14 @@
 #include "nsIBaseWindow.h"
 #include "nsIDocShellTreeOwner.h"
 #include "nsIInterfaceRequestor.h"
+#include "nsIWebProgressListener.h"
 
 class nsXULWindow;
 
 class nsChromeTreeOwner : public nsIDocShellTreeOwner,
-                                  public nsIBaseWindow, 
-                                  public nsIInterfaceRequestor
+                          public nsIBaseWindow, 
+                          public nsIInterfaceRequestor,
+                          public nsIWebProgressListener
 {
 friend class nsXULWindow;
 
@@ -45,6 +47,7 @@ public:
    NS_DECL_NSIINTERFACEREQUESTOR
    NS_DECL_NSIBASEWINDOW
    NS_DECL_NSIDOCSHELLTREEOWNER
+   NS_DECL_NSIWEBPROGRESSLISTENER
 
 protected:
    nsChromeTreeOwner();