Rated 5 out of 5 stars
I can confirm that bit.ly no longer appears to function with UrlbarExt. I suspect it may have something to do with bit.ly having moved their api from http://bit.ly/api (I don't know where they've moved it).
Is there any chance of an update to restore bit.ly functionality and perhaps add it's sister site j.mp? It would also be good to have the option to able to use my own username and APIKey with them.