It's a great addon but just like @Aenfa said below, it's starting to break. The github page of the addon doesn't show too much recent activity.

Abandonware. It seems the dev has completely abandoned this extension. No updates for over 7 months and it's breaking more and more websites. Dev needs to wake up.

Працює краще ніж його пращур! Рекомендую

¡Deshágase de las advertencias de cookies de casi todos los sitios web!

Is this project still alive? 3.5k problem reports on GitHub. Extension last updated 7 months ago.

Install this instead of "I don't care about cookies" as its foss, Avast and their spyware farm now own the original Firefox extension is fantastic. If you want hassle-free browsing, this extension is your ticket to a cleaner, more enjoyable web experience.

Please use this add-on over the original add-on as they were bought by Avast and your data won't be respected by them. Thanks for the fork to the dev(s)! <3

This blocks annoying cookie warnings sucessfully.