It is useful even if I already have Ublock origin.
It comes from a very trustworthy organization too.
I am happy that Mozilla gave it the "Recommended" badge.

diese ausgezeichnete Add-On blockt individuell einstellbar eine Menge Tracker!

I ❤ this its very nice thank you eff

has been using it for over a month, finding it a really good ad blocker, possibly due to its algorithm
possible improvement: when a tracker permission is changed by the user but then reversed back manually, automatically remove the 'click to return control...' button

Extensão muito boa e que se enquadra bem no Firefox de Desktop e bem com a resolução de tela para Android, mas precisa continuar a ser atualizada para garantir que a privacidade e segurança prevaleça importante na navegação de todos os usuários.

Toujours appréciable d'être en mode privée. Merci

Thank you so much, EFF! This is a MUST for anyone along with HTTPS Everywhere!