diff --git a/content/base/src/nsDocument.cpp b/content/base/src/nsDocument.cpp
index bdb7165ddaae..cb74154d68fc 100644
--- a/content/base/src/nsDocument.cpp
+++ b/content/base/src/nsDocument.cpp
@@ -6082,16 +6082,15 @@ nsDocument::AdoptNode(nsIDOMNode *aAdoptedNode, nsIDOMNode **aResult)
   PRBool sameDocument = oldDocument == this;
 
   JSContext *cx = nsnull;
-  JSObject *oldScope = adoptedNode->GetWrapper();
   JSObject *newScope = nsnull;
-  if (oldScope && !sameDocument) {
+  if (!sameDocument) {
     rv = nsContentUtils::GetContextAndScope(oldDocument, this, &cx, &newScope);
     NS_ENSURE_SUCCESS(rv, rv);
   }
 
   nsCOMArray<nsINode> nodesWithProperties;
   rv = nsNodeUtils::Adopt(adoptedNode, sameDocument ? nsnull : mNodeInfoManager,
-                          cx, oldScope, newScope, nodesWithProperties);
+                          cx, newScope, nodesWithProperties);
   if (NS_FAILED(rv)) {
     // Disconnect all nodes from their parents, since some have the old document
     // as their ownerDocument and some have this as their ownerDocument.
diff --git a/content/base/src/nsNodeUtils.cpp b/content/base/src/nsNodeUtils.cpp
index 3bf4b07fdc86..5c6f43f397b4 100644
--- a/content/base/src/nsNodeUtils.cpp
+++ b/content/base/src/nsNodeUtils.cpp
@@ -444,15 +444,14 @@ nsNodeUtils::CloneNodeImpl(nsINode *aNode, PRBool aDeep, nsIDOMNode **aResult)
 nsresult
 nsNodeUtils::CloneAndAdopt(nsINode *aNode, PRBool aClone, PRBool aDeep,
                            nsNodeInfoManager *aNewNodeInfoManager,
-                           JSContext *aCx, JSObject *aOldScope,
-                           JSObject *aNewScope,
+                           JSContext *aCx, JSObject *aNewScope,
                            nsCOMArray<nsINode> &aNodesWithProperties,
                            nsINode *aParent, nsINode **aResult)
 {
   NS_PRECONDITION((!aClone && aNewNodeInfoManager) || !aCx,
                   "If cloning or not getting a new nodeinfo we shouldn't "
                   "rewrap");
-  NS_PRECONDITION(!aCx || (aOldScope && aNewScope), "Must have scopes");
+  NS_PRECONDITION(!aCx || aNewScope, "Must have new scope");
   NS_PRECONDITION(!aParent || aNode->IsNodeOfType(nsINode::eCONTENT),
                   "Can't insert document or attribute nodes into a parent");
 
@@ -463,7 +462,8 @@ nsNodeUtils::CloneAndAdopt(nsINode *aNode, PRBool aClone, PRBool aDeep,
   // attributes and children).
 
   nsresult rv;
-  if (aCx) {
+  JSObject *wrapper;
+  if (aCx && (wrapper = aNode->GetWrapper())) {
       rv = xpc_MorphSlimWrapper(aCx, aNode);
       NS_ENSURE_SUCCESS(rv, rv);
   }
@@ -582,11 +582,9 @@ nsNodeUtils::CloneAndAdopt(nsINode *aNode, PRBool aClone, PRBool aDeep,
       elem->RecompileScriptEventListeners();
     }
 
-    if (aCx) {
+    if (aCx && wrapper) {
       nsIXPConnect *xpc = nsContentUtils::XPConnect();
       if (xpc) {
-        nsWrapperCache *cache;
-        CallQueryInterface(aNode, &cache);
         JSObject *preservedWrapper = nsnull;
 
         // If reparenting moves us to a new compartment, preserving causes
@@ -594,17 +592,17 @@ nsNodeUtils::CloneAndAdopt(nsINode *aNode, PRBool aClone, PRBool aDeep,
         // reparenting so we're sure to have the right JS object preserved.
         // We use a JSObject stack copy of the wrapper to protect it from GC
         // under ReparentWrappedNativeIfFound.
-        if (cache && cache->PreservingWrapper()) {
-          preservedWrapper = cache->GetWrapper();
-          nsContentUtils::ReleaseWrapper(aNode, cache);
+        if (aNode->PreservingWrapper()) {
+          preservedWrapper = wrapper;
+          nsContentUtils::ReleaseWrapper(aNode, aNode);
         }
 
         nsCOMPtr<nsIXPConnectJSObjectHolder> oldWrapper;
-        rv = xpc->ReparentWrappedNativeIfFound(aCx, aOldScope, aNewScope, aNode,
+        rv = xpc->ReparentWrappedNativeIfFound(aCx, wrapper, aNewScope, aNode,
                                                getter_AddRefs(oldWrapper));
 
         if (preservedWrapper) {
-          nsContentUtils::PreserveWrapper(aNode, cache);
+          nsContentUtils::PreserveWrapper(aNode, aNode);
         }
 
         if (NS_FAILED(rv)) {
@@ -648,8 +646,8 @@ nsNodeUtils::CloneAndAdopt(nsINode *aNode, PRBool aClone, PRBool aDeep,
     for (i = 0; i < length; ++i) {
       nsCOMPtr<nsINode> child;
       rv = CloneAndAdopt(aNode->GetChildAt(i), aClone, PR_TRUE, nodeInfoManager,
-                         aCx, aOldScope, aNewScope, aNodesWithProperties,
-                         clone, getter_AddRefs(child));
+                         aCx, aNewScope, aNodesWithProperties, clone,
+                         getter_AddRefs(child));
       NS_ENSURE_SUCCESS(rv, rv);
     }
   }
diff --git a/content/base/src/nsNodeUtils.h b/content/base/src/nsNodeUtils.h
index 426bf7a3071f..8fbde7c12b43 100644
--- a/content/base/src/nsNodeUtils.h
+++ b/content/base/src/nsNodeUtils.h
@@ -172,7 +172,7 @@ public:
                         nsIDOMNode **aResult)
   {
     return CloneAndAdopt(aNode, PR_TRUE, aDeep, aNewNodeInfoManager, nsnull,
-                         nsnull, nsnull, aNodesWithProperties, aResult);
+                         nsnull, aNodesWithProperties, aResult);
   }
 
   /**
@@ -190,18 +190,16 @@ public:
    * @param aCx Context to use for reparenting the wrappers, or null if no
    *            reparenting should be done. Must be null if aNewNodeInfoManager
    *            is null.
-   * @param aOldScope Old scope for the wrappers. May be null if aCx is null.
    * @param aNewScope New scope for the wrappers. May be null if aCx is null.
    * @param aNodesWithProperties All nodes (from amongst aNode and its
    *                             descendants) with properties.
    */
   static nsresult Adopt(nsINode *aNode, nsNodeInfoManager *aNewNodeInfoManager,
-                        JSContext *aCx, JSObject *aOldScope,
-                        JSObject *aNewScope,
+                        JSContext *aCx, JSObject *aNewScope,
                         nsCOMArray<nsINode> &aNodesWithProperties)
   {
     nsresult rv = CloneAndAdopt(aNode, PR_FALSE, PR_TRUE, aNewNodeInfoManager,
-                                aCx, aOldScope, aNewScope, aNodesWithProperties,
+                                aCx, aNewScope, aNodesWithProperties,
                                 nsnull);
 
     nsMutationGuard::DidMutate();
@@ -277,7 +275,6 @@ private:
    * @param aCx Context to use for reparenting the wrappers, or null if no
    *            reparenting should be done. Must be null if aClone is PR_TRUE or
    *            if aNewNodeInfoManager is null.
-   * @param aOldScope Old scope for the wrappers. May be null if aCx is null.
    * @param aNewScope New scope for the wrappers. May be null if aCx is null.
    * @param aNodesWithProperties All nodes (from amongst aNode and its
    *                             descendants) with properties. If aClone is
@@ -288,8 +285,7 @@ private:
    */
   static nsresult CloneAndAdopt(nsINode *aNode, PRBool aClone, PRBool aDeep,
                                 nsNodeInfoManager *aNewNodeInfoManager,
-                                JSContext *aCx, JSObject *aOldScope,
-                                JSObject *aNewScope,
+                                JSContext *aCx, JSObject *aNewScope,
                                 nsCOMArray<nsINode> &aNodesWithProperties,
                                 nsIDOMNode **aResult)
   {
@@ -299,7 +295,7 @@ private:
 
     nsCOMPtr<nsINode> clone;
     nsresult rv = CloneAndAdopt(aNode, aClone, aDeep, aNewNodeInfoManager,
-                                aCx, aOldScope, aNewScope, aNodesWithProperties,
+                                aCx, aNewScope, aNodesWithProperties,
                                 nsnull, getter_AddRefs(clone));
     NS_ENSURE_SUCCESS(rv, rv);
 
@@ -317,8 +313,7 @@ private:
    */
   static nsresult CloneAndAdopt(nsINode *aNode, PRBool aClone, PRBool aDeep,
                                 nsNodeInfoManager *aNewNodeInfoManager,
-                                JSContext *aCx, JSObject *aOldScope,
-                                JSObject *aNewScope,
+                                JSContext *aCx, JSObject *aNewScope,
                                 nsCOMArray<nsINode> &aNodesWithProperties,
                                 nsINode *aParent, nsINode **aResult);
 };