diff --git a/xpfe/appshell/src/nsWebShellWindow.cpp b/xpfe/appshell/src/nsWebShellWindow.cpp
index aeefa2d5d5e5..f863db067295 100644
--- a/xpfe/appshell/src/nsWebShellWindow.cpp
+++ b/xpfe/appshell/src/nsWebShellWindow.cpp
@@ -422,7 +422,7 @@ nsWebShellWindow::HandleEvent(nsGUIEvent *aEvent)
       case NS_MOVE: {
         // persist position, but not immediately, in case this OS is firing
         // repeated move events as the user drags the window
-        eventWindow->SetPersistenceTimer(PR_FALSE, PR_TRUE, PR_FALSE);
+        eventWindow->SetPersistenceTimer(PR_FALSE, PR_TRUE);
         break;
       }
       case NS_SIZE: {
@@ -432,17 +432,14 @@ nsWebShellWindow::HandleEvent(nsGUIEvent *aEvent)
           sizeEvent->windowSize->height, PR_FALSE);  
         // persist size, but not immediately, in case this OS is firing
         // repeated size events as the user drags the sizing handle
-        eventWindow->SetPersistenceTimer(PR_TRUE, PR_FALSE, PR_TRUE);
+        eventWindow->SetPersistenceTimer(PR_TRUE, PR_FALSE);
         result = nsEventStatus_eConsumeNoDefault;
         break;
       }
       case NS_SIZEMODE: {
         nsSizeModeEvent* modeEvent = (nsSizeModeEvent*)aEvent;
         aEvent->widget->SetSizeMode(modeEvent->mSizeMode);
-        // persist mode, but not immediately, because in many (all?)
-        // cases this will merge with the similar call in NS_SIZE and
-        // write the attribute values only once.
-        eventWindow->SetPersistenceTimer(PR_FALSE, PR_FALSE, PR_TRUE);
+        eventWindow->StoreBoundsToXUL(PR_FALSE, PR_FALSE, PR_TRUE);
         result = nsEventStatus_eConsumeDoDefault;
         // Note the current implementation of SetSizeMode just stores
         // the new state; it doesn't actually resize. So here we store
@@ -595,7 +592,7 @@ nsWebShellWindow::HandleEvent(nsGUIEvent *aEvent)
             // since the window has been activated, replace persistent size data
             // with the newly activated window's
             if (eventWindow->mChromeLoaded)
-              eventWindow->PersistPositionAndSize(PR_TRUE, PR_TRUE, PR_TRUE);
+              eventWindow->StoreBoundsToXUL(PR_TRUE, PR_TRUE, PR_TRUE);
 
             break;
           }
@@ -1156,14 +1153,13 @@ nsWebShellWindow::DestroyModalDialogEvent(PLEvent *aEvent)
 }
 
 void
-nsWebShellWindow::SetPersistenceTimer(PRBool aSize, PRBool aPosition, PRBool aMode)
+nsWebShellWindow::SetPersistenceTimer(PRBool aSize, PRBool aPosition)
 {
   PR_Lock(mSPTimerLock);
   if (mSPTimer) {
     mSPTimer->SetDelay(SIZE_PERSISTENCE_TIMEOUT);
     mSPTimerSize |= aSize;
     mSPTimerPosition |= aPosition;
-    mSPTimerMode |= aMode;
   } else {
     nsresult rv;
     mSPTimer = do_CreateInstance("@mozilla.org/timer;1", &rv);
@@ -1172,7 +1168,6 @@ nsWebShellWindow::SetPersistenceTimer(PRBool aSize, PRBool aPosition, PRBool aMo
                      SIZE_PERSISTENCE_TIMEOUT, NS_TYPE_ONE_SHOT);
       mSPTimerSize = aSize;
       mSPTimerPosition = aPosition;
-      mSPTimerMode = aMode;
     }
   }
   PR_Unlock(mSPTimerLock);
@@ -1185,8 +1180,7 @@ nsWebShellWindow::FirePersistenceTimer(nsITimer *aTimer, void *aClosure)
   PR_Lock(win->mSPTimerLock);
   win->mSPTimer = nsnull;
   PR_Unlock(win->mSPTimerLock);
-  win->PersistPositionAndSize(win->mSPTimerPosition, win->mSPTimerSize,
-                              win->mSPTimerMode);
+  win->StoreBoundsToXUL(win->mSPTimerPosition, win->mSPTimerSize, PR_FALSE);
 }
 
 
@@ -1385,6 +1379,12 @@ nsCOMPtr<nsIDOMDocument> nsWebShellWindow::GetNamedDOMDoc(const nsAString & aWeb
 
 //----------------------------------------
 
+/* copy the window's size and position to the window tag */
+void nsWebShellWindow::StoreBoundsToXUL(PRBool aPosition, PRBool aSize, PRBool aSizeMode)
+{
+   PersistPositionAndSize(aPosition, aSize, aSizeMode);
+} // StoreBoundsToXUL
+
 // if the main document URL specified URLs for any content areas, start them loading
 void nsWebShellWindow::LoadContentAreas() {
 
@@ -1737,7 +1737,7 @@ NS_IMETHODIMP nsWebShellWindow::Destroy()
   if (mSPTimer) {
     mSPTimer->Cancel();
     mSPTimer = nsnull;
-    PersistPositionAndSize(mSPTimerPosition, mSPTimerSize, mSPTimerMode);
+    StoreBoundsToXUL(mSPTimerPosition, mSPTimerSize, PR_FALSE);
   }
   PR_Unlock(mSPTimerLock);
 
diff --git a/xpfe/appshell/src/nsWebShellWindow.h b/xpfe/appshell/src/nsWebShellWindow.h
index 34222a4cb72a..70b635df6f9e 100644
--- a/xpfe/appshell/src/nsWebShellWindow.h
+++ b/xpfe/appshell/src/nsWebShellWindow.h
@@ -184,6 +184,7 @@ protected:
 
   nsCOMPtr<nsIDOMNode>     GetDOMNodeFromWebShell(nsIWebShell *aShell);
   void                     ExecuteStartupCode();
+  void                     StoreBoundsToXUL(PRBool aPosition, PRBool aSize, PRBool aSizeMode);
   void                     LoadContentAreas();
   PRBool                   ExecuteCloseHandler();
 
@@ -202,11 +203,11 @@ protected:
   nsIDOMNode * contextMenuTest;
 
   nsCOMPtr<nsITimer>      mSPTimer;
-  PRBool                  mSPTimerSize, mSPTimerPosition, mSPTimerMode;
+  PRBool                  mSPTimerSize, mSPTimerPosition;
   PRLock *                mSPTimerLock;
   nsCOMPtr<nsIPrompt>     mPrompter;
 
-  void        SetPersistenceTimer(PRBool aSize, PRBool aPosition, PRBool aMode);
+  void        SetPersistenceTimer(PRBool aSize, PRBool aPosition);
   static void FirePersistenceTimer(nsITimer *aTimer, void *aClosure);
 
 private: