diff --git a/content/base/src/nsDOMAttribute.cpp b/content/base/src/nsDOMAttribute.cpp
index c9fc9940e168..9a66932ce354 100644
--- a/content/base/src/nsDOMAttribute.cpp
+++ b/content/base/src/nsDOMAttribute.cpp
@@ -448,7 +448,7 @@ nsDOMAttribute::Clone(nsINodeInfo *aNodeInfo, nsINode **aResult) const
 NS_IMETHODIMP
 nsDOMAttribute::CloneNode(PRBool aDeep, nsIDOMNode** aResult)
 {
-  return nsNodeUtils::CloneNodeImpl(this, aDeep, aResult);
+  return nsNodeUtils::CloneNodeImpl(this, aDeep, PR_TRUE, aResult);
 }
 
 NS_IMETHODIMP
diff --git a/content/base/src/nsDocument.cpp b/content/base/src/nsDocument.cpp
index cb74154d68fc..407219112f04 100644
--- a/content/base/src/nsDocument.cpp
+++ b/content/base/src/nsDocument.cpp
@@ -5778,7 +5778,7 @@ nsDocument::AppendChild(nsIDOMNode* aNewChild, nsIDOMNode** aReturn)
 NS_IMETHODIMP
 nsDocument::CloneNode(PRBool aDeep, nsIDOMNode** aReturn)
 {
-  return nsNodeUtils::CloneNodeImpl(this, aDeep, aReturn);
+  return nsNodeUtils::CloneNodeImpl(this, aDeep, !mCreatingStaticClone, aReturn);
 }
 
 NS_IMETHODIMP
diff --git a/content/base/src/nsGenericDOMDataNode.h b/content/base/src/nsGenericDOMDataNode.h
index e4c6152bbc2e..002d066d694e 100644
--- a/content/base/src/nsGenericDOMDataNode.h
+++ b/content/base/src/nsGenericDOMDataNode.h
@@ -485,7 +485,7 @@ private:
     return nsGenericDOMDataNode::IsSupported(aFeature, aVersion, aReturn);  \
   }                                                                         \
   NS_IMETHOD CloneNode(PRBool aDeep, nsIDOMNode** aReturn) {                \
-    return nsNodeUtils::CloneNodeImpl(this, aDeep, aReturn);                \
+    return nsNodeUtils::CloneNodeImpl(this, aDeep, PR_TRUE, aReturn);       \
   }                                                                         \
   virtual nsGenericDOMDataNode *CloneDataNode(nsINodeInfo *aNodeInfo,       \
                                               PRBool aCloneText) const;
diff --git a/content/base/src/nsGenericElement.h b/content/base/src/nsGenericElement.h
index 8344dc8acb28..be3867b3ac30 100644
--- a/content/base/src/nsGenericElement.h
+++ b/content/base/src/nsGenericElement.h
@@ -544,7 +544,7 @@ public:
                             PRBool* aReturn);
   nsresult CloneNode(PRBool aDeep, nsIDOMNode **aResult)
   {
-    return nsNodeUtils::CloneNodeImpl(this, aDeep, aResult);
+    return nsNodeUtils::CloneNodeImpl(this, aDeep, PR_TRUE, aResult);
   }
 
   //----------------------------------------
diff --git a/content/base/src/nsNodeUtils.cpp b/content/base/src/nsNodeUtils.cpp
index 5c6f43f397b4..9d4e9fa9512d 100644
--- a/content/base/src/nsNodeUtils.cpp
+++ b/content/base/src/nsNodeUtils.cpp
@@ -418,7 +418,9 @@ nsNodeUtils::TraverseUserData(nsINode* aNode,
 
 /* static */
 nsresult
-nsNodeUtils::CloneNodeImpl(nsINode *aNode, PRBool aDeep, nsIDOMNode **aResult)
+nsNodeUtils::CloneNodeImpl(nsINode *aNode, PRBool aDeep,
+                           PRBool aCallUserDataHandlers,
+                           nsIDOMNode **aResult)
 {
   *aResult = nsnull;
 
@@ -429,7 +431,7 @@ nsNodeUtils::CloneNodeImpl(nsINode *aNode, PRBool aDeep, nsIDOMNode **aResult)
   NS_ENSURE_SUCCESS(rv, rv);
 
   nsIDocument *ownerDoc = aNode->GetOwnerDoc();
-  if (ownerDoc) {
+  if (ownerDoc && aCallUserDataHandlers) {
     rv = CallUserDataHandlers(nodesWithProperties, ownerDoc,
                               nsIDOMUserDataHandler::NODE_CLONED, PR_TRUE);
     NS_ENSURE_SUCCESS(rv, rv);
diff --git a/content/base/src/nsNodeUtils.h b/content/base/src/nsNodeUtils.h
index 8fbde7c12b43..8b19c4ab8bde 100644
--- a/content/base/src/nsNodeUtils.h
+++ b/content/base/src/nsNodeUtils.h
@@ -242,9 +242,11 @@ public:
    *
    * @param aNode the node to clone
    * @param aDeep if true all descendants will be cloned too
+   * @param aCallUserDataHandlers if true, user data handlers will be called
    * @param aResult the clone
    */
   static nsresult CloneNodeImpl(nsINode *aNode, PRBool aDeep,
+                                PRBool aCallUserDataHandlers,
                                 nsIDOMNode **aResult);
 
   /**