Single-handedly, Firefox (independently from how crappy it can be at times) is what is keeping me on Android. Its full extension support (i.e.: uBlock Origin support) is something that I can't really do without.
I do wonder if the crowd here knows of other good alternatives though - specifically, Android and/or iOS browsers with "full" uBlock Origin support (no uBlock origin lite, no other blocker, ...). I would love to be made aware of a few alternatives.
I am aware that there is a browser from Kagi that works on iOS (I think?) but it's still in beta and closed sourced so not ready for prime time on my device. I am also aware of some peers of Firefox like Waterfox.
Orion (by Kagi) with full ublock origin on iOS, atleast that was the case about 6 months ago that I am aware of on Apple’s ecosystem. I’ve long jumped to pihole/adguard home to block ads at the router level so I went back to stock safari after that and use Tailscale to retain the router blocking capabilities when I’m on cell service.
Edge for Android also has (limited) extension support.
It only supports a subset of extensions, but I am using uBlock Origin (full version, although _lite_ is also available), Sponsorblock and Dark Reader for example.
Not uBlock Origin but Brave's own blocker is written in Rust and it is much more battery efficient than Firefox+uBO. It is equally powerful too (you can also add custom lists). Firefox is both slow and eats a lot of battery.