Rated 5 out of 5 stars

http://darklaunch.com/2009/07/06/use-blocksite-with-firefox-3-5-ubuntu

Be smart and search up your firefox extentions folder on google then find it accordingly.

and dont change the 3,0 to 3.5. It doesnt work. Change it to 4,0

This review is for a previous version of the add-on (0.7.1).