I listen to songs in Grooveshark almost daily and even though I pin it as an app tab , it gets lost and if i need to pause it , I am in trouble , luckily an firefox addon ( & andriod app).
The addon called as Grooveshark remote fixes that , it adds an bar to the firefox addon bar .
Links
1.To the firefox addon :- https://addons.mozilla.org/en-US/firefox/addon/grooveshark-remote-control/
2.Andriod App :- https://market.android.com/details?id=uk.co.awesomedigital.gsremote&hl=en