Issue

Your problem here is that you probably aren't using the correct permissions. To get cookies from a certain url/page you'll need to use the chrome.cookies API. This API needs the permissions for cookies and all the URLs you want to retrieve cookies from.

Solution

In your manifest.json, request the permissions you need. If you want to retrieve cookies from all the sites, you can use the <all_urls> permission. Or, if you want cookies only from that site you can use, for example, http://luptaonline.com/*. I also noticed that you are using the chrome.tabs API, so the permissions in manifest.json should look like this:

...

permissions: [

    cookies,

    tabs,

    <all_urls>

],

...

Now, in your background.js, you can easily call the chrome.cookies.get() method to retrieve the PHPSESSID cookie, like this:

var myUrl = http://luptaonline.com/player/; // assuming that this is the url



chrome.cookies.get({url: myUrl, name: 'PHPSESSID'}, function(cookie) {

    // do something with the cookie

    console.log(cookie);

    alert(cookie.name + ' found, value: ' + cookie.value);

});

Running the above code you'll get what you want. Here are some screenshot of the results:

Console log:

Cookie alert:

Working example

You can download a working example of the extension HERE.

Documentation

You may find this documentation links helpful:

• chrome.cookies API


• chrome.cookies.get method