2- now all the Audio skins will start retrieving song info and control web media players, see on the webnowplaying companion extension page for a full list of supported players.
3- For Firefox uses, you have to type about:config in your search bar, then click on “i accept the risk” next search for network.websocket.allowInsecureFromHTTPS
Its value should say False, change it to True by double-clicking on it then close the page and restart Firefox, It should work Now.