Rated 4 out of 5 stars

I like it very much, but as the previous comment says, it is kind of overlapping with Mozilla"s "Add-on collector".. partially at least.
But where there is a strong need, it's for another Mozilla-based product, Songbird, that has its own add-on web site with no "add-on collector".
If you could adapt your extension for Songbird, that would be tremendous!

This review is for a previous version of the add-on (0.5.0).