I could have rate it 5 stars if it had the ability to either: configure 1) different schedules for different sites in the block list; or 2) at least configure different schedules for different days of the week, even if for all sites in the block list (as a whole). Examples for both scenarios:
1) block site A for Mo/Tu/We/Th/Fr from 19:00 to 00:00 and for Sa/Su from 10:00 to 00:00;
block site B, period!
2) block all the sites in the block list for Mo/Tu/We/Th/Fr from 19:00 to 00:00 and for Sa/Su from 10:00 to 00:00;

Another useful feature would be to allow a given time interval (in timer or countdown style) to access a site in the block list, if defined by the user as an extra to the scheduling, again either 1) site by site; or 2) as a whole, that is, applied to all sites in the block list. Example: I want to have the possibility to access Site A for 01:00 any day of the week, regardless of the scheduling rules defined above. That 01:00 time frame would reset every midnight.

Nevertheless, it's a good Firefox extension! ;-)

This is one of the best tools for blocking those annoying ransom ware pages.

nice

Poderia fechar a página no lugar de só bloquear, aí seria perfeito

used to work, now it just deletes the new sites you add, so it doesn't block anything anymore.

Bad ux design. The blocked list is hard to find. White list / Black list are not clear enough.

It used to work, but now it doesn't. I set it to block a site, and within 5 seconds the site will unblock itself and it will forget my blocked sites list. I've tried uninstalling BlockSite, Firefox, deleting all of Firefox's data and restarting my PC, but the problem still persists.

It just deletes my list of blocked websites over and over again.

Beware. This is SPYWARE. Both my credit cards were compromised the short time I had this extension on.

It helps me a kot for blocking sites at my work time and study time loved it

Saved My life.
Thanks

Love this add on, I am easily distracted but now I've put another level of discipline between the web and my ceaselessly wandering mind. Thanks.

Great! It blocks and blocks and blocks. Could (only) be better if it blocked the side-bar also!