Or Brave on Android; it's basically indistinguishable from Chrome (or whatever the Android standard browser currently is called).

Just tried this. Other than having to redo all my forums passwords again this browser looks to be a winner. On my phone firefox ran very slowly and hogged too many resources.

Try nightly - 57 feels like it has big performance gains on my ageing 1+

Or root and AdAway if you're looking to block them in other apps as well.