Firefox CloneInto does not copy function from add-in script to script page

I created a Greasemonkey script that contains an object that I would like to make available from the page's internal scripts.

There are several safe ways to do this , described on this page .
One is to use the Components.utils.cloneInto function .

Here's an example script.

// ==UserScript==
// @name        Test CloneInto
// @namespace   Test CloneInto
// @description Test CloneInto
// @include     http://stackoverflow.com*
// @version     1
// @grant       GM_xmlhttpRequest
// ==/UserScript==

var myObj = {}

myObj.test = function() {
  alert("works");
}

myObj.num = 152;

unsafeWindow.myObj = cloneInto(myObj, unsafeWindow, {cloneFunctions: true});

var scriptDOM = document.createElement("script");
scriptDOM.type = "text/javascript";
scriptDOM.innerHTML = "alert(window.myObj.num);\
                       alert(window.myObj.test);"
document.getElementsByTagName("head")[0].appendChild(scriptDOM);

      

        
        
        
      

    

"152" displays correctly, but "undefined" appears instead of my function.
However, I used {cloneFunctions: true}

as suggested in the documentation.

I am using Firefox 34, has any idea how to fix this?

Edit: It works fine with Google Chrome and Tampermonkey.
Edit 2: Opened issue 2070 in the Greasemonkey repository .