Implement socket.io inside chrome extension or other internal JS files using jquery.

socketconnect.js

//Socket server connect to listen to data.

$.getScript('http://yoursocketioserver/socket.io/socket.io.js',function() {

    socket = io.connect('http://lyoursocketioserver');

    socket.on('connect', function(){

        socket.on('message', function (data) {
                
            //On data, do something with this... 

        });

    });

});