Sagar,
you sent me the code privately,and i made the changes, but wanted the response here in case others come across it.
First, you needed to redefine the default security policy to include the googleapis url
Second, "popup" now needs to be "default_popup" in browser_action
{
...
"browser_action": {
...
"default_popup": "popup.html"
},
...
}
Third, all js in popup.html needed to be moved out to a external file, I created a main.js file for you and included it in the head of your html file
Fourth, the zrssfeed plugin you were using had no options set, I turned on ssl as an option, again for the content_security_policy to match, your feed was just http not https
Lastly, an easy one to miss, you were using jQuery 1.4.2, so I just changed it to 1.7.2 - you may want to check if everything is working for you like it should.