Rated 5 out of 5 stars
Nice work !
Work well and add this missing functionnality to Firefox.
A little bug: the caption of the extension in the update tooltip (http://img684.imageshack.us/img684/3056/updateee.png).
I think it's fixed with version 1.9 (not reviewed yet, but can be found under "Version Information" > "Version 1.8" link.) Although I was never able to reproduce the error, instead of filling the tooltip as extensions report back, now I wait until they all report back and then fill the tooltip from an array.