Outstandingly Useful Rated 4 out of 5 stars

What a most useful addon! Did exactly as described, though with a minor apparent hang. But I understand this as the addon itself warns me it can happen due to the way addons install. So.. yeah. Great stuff!

This review is for a previous version of the add-on (0.9.6). 

Yeah, there's nothing we can do about that hang now because it's Firefox itself taking its time to collect installation data from the web, piece by piece. This probably can change with FF4 because it will provide (and promote) an alternative, asynchronous installation path, so all this housekeeping stuff is going to work in the background while the user can go on with their browsing, though I have yet to see how it's going to work overall, when I have a copy of Collector fully compatible with FF4 to play with.
Thanks for your review, I'm really touched by all the positive comments.