Remember a few weeks ago when YouTube made a big deal about its new music video page that sorts out every single music video that's hosted on the service? You can now put it to far better use with a new Firefox extension called Scrolling Lyrics Player (SLP) that turns each video page into a honest to goodness karaoke player.

Once installed, SLP will sit just to the right of any YouTube video and do a search for the lyrics of whatever music video or song recording you're watching. It then syncs that up with the timing of the video, which I might add, is nowhere near to being an exact science.

What's nice is that you can adjust the start time of when the lyrics begin, so if you're watching something that does not time up to a song's lyrical timeline, it's as easy as scrolling your mouse wheel up or down to get it in sync. It also does not enable itself on what it perceives as a non-music video, leaving the normal YouTube UI intact.

More: http://news.cnet.com/8301-27076_3-20013129-248.html