Why doesn't think Greasemonkey script run in Greasekit [which I have on FluidApp]

[helpm...@yahoo.com]

I am using this :

// ==UserScript==
// @name          Amazon ASIN Links
// @include       http://www.amazon.tld/*/dp/*
// @include       http://www.amazon.tld/*gp/product/*
// ==/UserScript==


(function(){
    function getASIN(href) {
      var asinMatch;
      asinMatch = href.match(/\/exec\/obidos\/ASIN\/(\w{10})/i);
      if (!asinMatch) { asinMatch = href.match(/\/gp\/product\/(\w{10})/i); }
      if (!asinMatch) { asinMatch = href.match(/\/exec\/obidos\/tg\/detail\/\-\/(\w{10})/i); }
      if (!asinMatch) { asinMatch = href.match(/\/dp\/(\w{10})/i); }
      if (!asinMatch) { return null; }
      return asinMatch[1].toUpperCase();
    }

    var origTitle, origTitleHTML;
    var asin = getASIN(window.content.location.href);

    if (!asin) { return; }

    origTitle = document.evaluate(
      "//h1[@class='parseasinTitle']", 
      document, 
      null, 
      XPathResult.FIRST_ORDERED_NODE_TYPE, 
      null ).singleNodeValue;

    if (!origTitle) { return; }

    origTitleHTML = origTitle.innerHTML;
    origTitle.innerHTML = origTitleHTML + '   ' + asin + '';
})();

when I try to run this in greasekit, it doesn't work. It does work just fine in Firefox with GreaseMonkey, so sad it doesn't work here too. (I need to do multiple simultaneous logins, so Firefox isn't enough)

I am using FluidApp, a Site Specific Browser (SSB), which has built in greasekit support.