Very good. Youtube no ads with no Premium. ALL ads sites will be ad free! A+++

works well on chrome browser too

I have used StandsApp Fair AdBlocker on chrome for years and have loved being able to use it on firefox since I have no switched entirely to this. Standsapp was the one extension that I didn't think I could do without. UblockOrigin or whatever it is, is fine, but this one is the BEST. it lets you have some ads be shown, so that sites that see you have an adblocker don't always block you from viewing their content, because they're still making SOME money. With 2-3 ads shown, I'm not giving in to being indoctrinated regularly, but I am able to choose the ads that are comfortable to me.

So far, this is the only adblocker that allows you to pick elements it missed, block them, and then still block them when you reload the page. They also have a clearly stated privacy policy, which is important. It works, and it is easy.