I used brave on Android some time ago as well. Firefox really wasn't an option back then, as the rendering engine was just to slow for reading webnovels... But adblock is essentially required on mobile because of the energy drain from ads

I ultimately went back to chrome though after I installed blokada. You might want to check that out as well.

You can get it from f-droid if you have that app store already.

https://blokada.org/index.html