A simple Firefox extension to remote control the new Grooveshark API from any webpage you're browsing.
This extension is coded with the new AddonSDK for Firefox, so if you want to fork this and contribute some code, first you need to get the AddonSDK. To do that, just follow the steps in the AddonSDK Repo page.
https://addons.mozilla.org/en-US/firefox/addon/grooveshark-remote-control