Some new life poured into Greasemonkey? :P Rated 5 out of 5 stars
So far worked great for me but haven't tested it intensively yet.
It's great to see some improvements over "rigid" Greasemonkey UI.
Hope this will always stay in active development :P
BUG: on Minefield when trying to open options from Add-ons panel (about:addons) will cause freze.