Reset the navigator object for each new document -- plugins may have changed, bug 150087 r=av sr=jst

dom/src/base/nsGlobalWindow.cpp

@@ -378,6 +378,10 @@ GlobalWindowImpl::SetNewDocument(nsIDOMDocument* aDocument,
     ::JS_ClearWatchPointsForObject((JSContext *)mContext->GetNativeContext(),
                                    mJSObject);
 
+  // Release the navigator object so that it will be recreated for the new document
+  // The plugins or mime types array may have changed. See bug 150087
+  NS_IF_RELEASE(mNavigator);
+
   if (mFirstDocumentLoad) {
     if (aDocument) {
       mFirstDocumentLoad = PR_FALSE;