--- a/content/html/content/src/nsGenericHTMLElement.cpp
+++ b/content/html/content/src/nsGenericHTMLElement.cpp
@@ -815,31 +815,31 @@ nsGenericHTMLElement::SetInnerHTML(const
   }
 
   return rv;
 }
 
 NS_IMETHODIMP
 nsGenericHTMLElement::SetOuterHTML(const nsAString& aOuterHTML)
 {
-  nsINode* parent = GetNodeParent();
+  nsCOMPtr<nsINode> parent = GetNodeParent();
   if (!parent) {
     return NS_OK;
   }
 
   if (parent->NodeType() == nsIDOMNode::DOCUMENT_NODE) {
     return NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR;
   }
 
   if (OwnerDoc()->IsHTML()) {
     nsIAtom* localName;
     PRInt32 namespaceID;
     if (parent->IsElement()) {
-      localName = static_cast<nsIContent*>(parent)->Tag();
-      namespaceID = static_cast<nsIContent*>(parent)->GetNameSpaceID();
+      localName = static_cast<nsIContent*>(parent.get())->Tag();
+      namespaceID = static_cast<nsIContent*>(parent.get())->GetNameSpaceID();
     } else {
       NS_ASSERTION(parent->NodeType() == nsIDOMNode::DOCUMENT_FRAGMENT_NODE,
         "How come the parent isn't a document, a fragment or an element?");
       localName = nsGkAtoms::body;
       namespaceID = kNameSpaceID_XHTML;
     }
     nsCOMPtr<nsIDOMDocumentFragment> df;
     nsresult rv = NS_NewDocumentFragment(getter_AddRefs(df),