Review for Update Notifier by RealityRipple
Rated 5 out of 5 stars
Lots of features in this little notifier, and no problems in sight. The ability to control how often updates are checked for is pretty nifty, being able to restart Firefox with the icon is even cooler, and automatic installation of updates just takes the cake.
To create your own collections, you must have a Mozilla Add-ons account.