I was in the middle of moving from Chrome to Firefox last week and then Mozilla did the thing. So now... Jumping around, testing! LibreWolf seems to be ok for now. And for solid ad blocking, Ublock Origin still works in Gecko browsers.

Anyone using Chromium browsers with manifest v3, you can use the new Ublock Origin Lite, it's by the same developer. It is more limited in functionality but so far it's worked for everything for me.

You can also block ads at the network level by using a custom DNS handler with ad blocking lists. You set the custom DNS URL in your phone, laptop, or even router. No more ads! I recommend NextDNS.