On PC and Android, you can get privacy extentions like uBlock Origin that blocks most ads and trackers. What about firefox do you not like?
On Android, I personally use Fennec, which is a fork of Firefox maintained by the same non-profit organization but without any Google-Play shennanigans.
Assuming you mean built-in adblock and so on, Librewolf on the Desktop and the Mull Browser on Android. The latter is the default browser for DivestOS, a custom rom based on LineageOS.
Well, Mull doesn't have a buil-in blocker, but you can use uBlock Origin