Issue 2877 - Element Hiding Helper causes tab to crash when selecting some elements

chrome/content/frameScript.js

 /*
  * This Source Code is subject to the terms of the Mozilla Public License
  * version 2.0 (the "License"). You can obtain a copy of the License at
  * http://mozilla.org/MPL/2.0/.
  */
 
 (function()
 {
   const Cu = Components.utils;
 
@@ skipping 10 matching lines @@
     shutdown();
     Cu.unload(module);
     removeMessageListener("ElemHideHelper:Shutdown", onShutdown);
     removeMessageListener("ElemHideHelper:GetNodeInfo", onGetNodeInfo);
     removeMessageListener("ElemHideHelper:Preview", onTogglePreview);
   }
 
   function onGetNodeInfo(message)
   {
     let nodeInfo = getNodeInfo(message.objects.element);
-    message.objects.callback(JSON.stringify(nodeInfo));
+    nodeInfo.messageId = message.data;
+    sendAsyncMessage("ElemHideHelper:GetNodeInfo:Response", nodeInfo);
   }
 
   function onTogglePreview(message)
   {
     togglePreview(message.data.nodeID, message.data.stylesheetData);
     if (message.data.forgetNode)
       forgetNode(message.data.nodeID);
   }
 })();