diff --git a/content/xbl/src/nsBindingManager.cpp b/content/xbl/src/nsBindingManager.cpp
index 77d9c4b4f771..ec64b86f30d1 100644
--- a/content/xbl/src/nsBindingManager.cpp
+++ b/content/xbl/src/nsBindingManager.cpp
@@ -425,7 +425,7 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsBindingManager)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSTARRAY_MEMBER(mAttachedStack,
                                                     nsXBLBinding)
   // No need to traverse mProcessAttachedQueueEvent, since it'll just
-  // fire at some point.
+  // fire at some point or become revoke and drop its ref to us.
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_CLASS(nsBindingManager)
@@ -965,8 +965,7 @@ void
 nsBindingManager::PostProcessAttachedQueueEvent()
 {
   mProcessAttachedQueueEvent =
-    new nsRunnableMethod<nsBindingManager>(
-      this, &nsBindingManager::DoProcessAttachedQueue);
+    NS_NEW_RUNNABLE_METHOD(nsBindingManager, this, DoProcessAttachedQueue);
   nsresult rv = NS_DispatchToCurrentThread(mProcessAttachedQueueEvent);
   if (NS_SUCCEEDED(rv) && mDocument) {
     mDocument->BlockOnload();
@@ -1555,6 +1554,9 @@ nsBindingManager::DropDocumentReference()
 {
   // Make sure to not run any more XBL constructors
   mProcessingAttachedStack = PR_TRUE;
+  if (mProcessAttachedQueueEvent) {
+    mProcessAttachedQueueEvent->Revoke();
+  }
   mDocument = nsnull;
 }
 
diff --git a/content/xbl/src/nsBindingManager.h b/content/xbl/src/nsBindingManager.h
index 75f4c888e61c..ca34af3a112a 100644
--- a/content/xbl/src/nsBindingManager.h
+++ b/content/xbl/src/nsBindingManager.h
@@ -306,7 +306,7 @@ protected:
 
   // Our posted event to process the attached queue, if any
   friend class nsRunnableMethod<nsBindingManager>;
-  nsCOMPtr<nsIRunnable> mProcessAttachedQueueEvent;
+  nsRefPtr< nsRunnableMethod<nsBindingManager> > mProcessAttachedQueueEvent;
 
   // Our document.  This is a weak ref; the document owns us
   nsIDocument* mDocument;