Issue 2816 - Partial fix for EHH button in inspector tool, preview functionality still broken

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;
 
   let rand = Components.stack.filename.replace(/.*\?/, "");
   let module = "chrome://elemhidehelper/content/actor.jsm?" + rand;
-  let {shutdown} = Cu.import(module, {});
+  let {shutdown, getNodeInfo} = Cu.import(module, {});
 
   addMessageListener("ElemHideHelper:Shutdown", onShutdown);
+  addMessageListener("ElemHideHelper:GetNodeInfo", onGetNodeInfo);
 
   function onShutdown()
   {
     shutdown();
     Cu.unload(module);
     removeMessageListener("ElemHideHelper:Shutdown", onShutdown);
+    removeMessageListener("ElemHideHelper:GetNodeInfo", onGetNodeInfo);
+  }
+
+  function onGetNodeInfo(message)
+  {
+    let info = getNodeInfo(message.objects.element);
+    message.objects.callback(info.nodeData, info.host);
   }
 })();