My top three add-on when I use Firefox.

Até o momento está bloqueando os avisos e anúncios insuportáveis do Youtube, porém também bloqueou sites de downloads, se não tiver como mudar isso nas configurações, não serve para mim.

seems to be working again on youtube as of 6/26. thank you, developers, for your hard work. sorry i was so harsh in my last review, i was upset at youtube

Works great. If you get two rectangles, one grey one red, you need to do a clean reinstall of firefox.

This is an amazing add-on! It's unobtrusive, it's powerful, and it's damned effective, even at blocking ads on Youtube. It is nicely adjustable as well, letting you block irritating elements on a page.

the best add block extension of all time, it has never failed me up on its' task. thank you so much uBlock Origin

Super efficace !