diff --git a/content/xbl/src/nsXBLService.cpp b/content/xbl/src/nsXBLService.cpp
index 02b7634ed88..ba6b4ce1eca 100644
--- a/content/xbl/src/nsXBLService.cpp
+++ b/content/xbl/src/nsXBLService.cpp
@@ -141,9 +141,11 @@ struct nsXBLBindingRequest
         
     nsCOMPtr<nsIPresShell> shell = getter_AddRefs(doc->GetShellAt(0));
     if (shell) {
+      nsIFrame* childFrame;
+      shell->GetPrimaryFrameFor(mBoundElement, &childFrame);
       nsCOMPtr<nsIDocumentObserver> obs(do_QueryInterface(shell));
-      obs->ContentRemoved(doc, parent, mBoundElement, index);
-      obs->ContentInserted(doc, parent, mBoundElement, index);
+      if (!childFrame)
+        obs->ContentInserted(doc, parent, mBoundElement, index);
     }
   }
 
diff --git a/layout/xbl/src/nsXBLService.cpp b/layout/xbl/src/nsXBLService.cpp
index 02b7634ed88..ba6b4ce1eca 100644
--- a/layout/xbl/src/nsXBLService.cpp
+++ b/layout/xbl/src/nsXBLService.cpp
@@ -141,9 +141,11 @@ struct nsXBLBindingRequest
         
     nsCOMPtr<nsIPresShell> shell = getter_AddRefs(doc->GetShellAt(0));
     if (shell) {
+      nsIFrame* childFrame;
+      shell->GetPrimaryFrameFor(mBoundElement, &childFrame);
       nsCOMPtr<nsIDocumentObserver> obs(do_QueryInterface(shell));
-      obs->ContentRemoved(doc, parent, mBoundElement, index);
-      obs->ContentInserted(doc, parent, mBoundElement, index);
+      if (!childFrame)
+        obs->ContentInserted(doc, parent, mBoundElement, index);
     }
   }