Rated 5 out of 5 stars
Not sure why the author made this Windows only, but it's working just fine in Fedora 18 with Firefox 18 and Gnome 3.6.
Glad to know that it works well on LINUX!
I simply didn't marked new versions Linux-compatible because I couldn't test them yet in such systems, that's all :)
I'm about to announce here (at AMO page) a new BETA version with many changes that I'll release @ support site, for everyone to try.