This addon is inspired by the original groovesharkUnlocker plugin.
Using a proxy server this addon tells grooveshark.com you're connecting from inside the US, so you can use their music streaming service although you're located in Germany.
Simply open the URL grooveshark.com and the magic will happen :)
Since version 1.3.1 the addon has become more dynamically and user friendly. I.e. every time you will find yourself with a non-working proxy, a dialog will popup so you can change the proxy server.
Just give it a try. I'm always open for suggestions to improve this addon!