This blocker is simple and great to use. It's UI is more simplified. This blocker blocking all the sites which one needs to block. This app has improved.
When you right click to block site then it's actually blocked but to see effect you have to close the tab. You can also block manually in it's settings page.

All the other 'site blockers' with extra features failed to block a site.

This one does what it's asked.

its says right click to block! I right click, there is a list but NO BLOCK OPTION!

simple , fast, and effective.

ne može više od dva linka da primi, kada mu se doda treći odmah se briše drugi link

"can't block domains"

kalap szar semmit nem csinál

This was supposed to be for Android by this link as said so? But no! It does not support to be as an add-on when pressed even to download it manually. It worked great for me on my desktop but this is a lie for android. Either make it truly working for Android or have this useless page for Android add-ons removed. It appears Firefox hasn't really pushed up more add-ons for android devices for very long since. It has become a bore to use android with so much limitations.

O Firefox bloqueou o Duolingo e não consegui desbloqueá-lo usando as sugestões do Forum de Ajuda do Mozzila. Com este Add-on, fui no ícone da barra de ferramentas, em "opções" e estava lá o bloqueio, foi só apertar no "x"zinho e tudo voltou ao normal. Top!

Not work
right click in page not show "add block site" command

Obrigado por conter meus vícios.

This extension works extremely well to block ads.

it works for me... are you guys not using it on desktop?

doestn work

piece of s....

This site completely blocks a domain from establishing any connection to my browser. At least, the sites I blocked couldn't set any cookies when I checked with my cookie manager. I tried another block site addon and it lets set cookies. Fortunately, this one by Allen won't allow blocked domains to set any cookies. Thanks.