From Rob W:
Adds a screen with Lyrics to Grooveshark and YouTube videos. This screen can be moved, resized, toggled and closed. Human-readable lyrics are immediately shown, together with a link to the source and an option to look up the lyrics from a different source.
A search box provides a way to look up lyrics for *any* song. When the song's lyrics cannot be found at any of the sources, a link to Google will be shown instead.
Multiple lyric providers which are known to be reliable are included with the extension. The order of the sources can be changed, which allows you to get lyrics even faster. If you don't like a source, it can be disabled.