A Firefox toolbar that is the best way to follow Twitter & Facebook updates, and post to Twitter and Facebook
I tried this add-on once before too. I thought it was too quick to switch to the next tweet. It seemed too much like a slide show toy rather then anything one could actually use. I didn't like it much at all. Plus, it took up A LOT of room in the stuts bar and that bothered me more then anything.
I am not a big fan of this add-on for Firefox. It slows my machine's performance and after a few days it decided that it could no longer log into my Facebook account. I will probably be removing it soon... The only reason I still have it installed is that it has a pause button. Most of the time I don't even have it running.