AdBlock Plus Rated 5 out of 5 stars

Read review on uninstalling and then reinstalling, that did the trick. This is still a great add on. Perhaps Firefox needs to check and see what the problem is with the updater software. Might have a bug there guys. Don't know, but glad its working again.

This review is for a previous version of the add-on (2.1.1-signed).  This user has a previous review of this add-on.