Last day i noticed that my Google-Friend connect plugin is not working for my latest wordpress.I tried a lot to find out the issues behind that.I realized that it is not a code issue since gadget is shown properly in a static page.So,there must be clashes with other plugin codes which might prevent my gadget to load up.I have been seeing  just a empty plain or white box ,nothing else.
I searched a lot,and at last found out the issue.It was a bug in Prototype JS Framework which causes it to interfere with the Native JSON parser in Firefox 3.5 and leads to the GFC-prototype conflict.[Refer Explanation]
So,Just copy this piece of code and paste it above the google-connect gadget code.The better option is ,place the code in the header.php of the wordpress code.
<br /> <script> window.JSON = { parse: function(st){ return st.evalJSON(); }, stringify: function(obj){ return Object.toJSON(obj); } }; </script>