Doesn't Work Rated 1 out of 5 stars

It's not even available for me to add to the Firefox 3.6.1 toolbar on my Windows 7 machine. I've re-installed it a couple of times and looked all over, but there's no way to even get the tree to show up. :-( Still works on my old laptop with Vista & Firefox 5.1

This review is for a previous version of the add-on (1.9.36).