Don't download it. It doesn't work at all.

doesn't work at all. still full access to sites.
(using FF Developer Edition)

Does not work on Firefox on Windows 10. Please fix.

If a script launches a new window, BlockSite does nothing to stop it. Also, it seems that the website is very specific, there doesn't seem to be a way to specify a wildcard.

it does not work in new window (Ctrl + N)

Worked great! It's easy to use.

Using firefox 59.0.2.
The add-on doesn't seem functional. I'm able to set all of the settings and the interface seems to work, but I'm still able to access blocked sites. I've tried restarting to double check.
I'll change the rating should anything change.

good!

It doesn't work on Firefox Quantum (59.0.2)

Si al quererla desinstalar pidiera la contraseña... seria genial... pero de nada sirve la protección si con solo desactivarla o desinstalarla facilmente se quita dicha proteccion

Does not work with Firefox.

very good

It works well enough

Решил проблему.