Firefox is still an option, but if you aren't fond of Mozilla, you also have Fennec (the F-Droid build that removes telemetry bits by default) and IronFox (a more secure spin of Firefox)

You can decide whether to use Firefox Sync or not depending on how much you trust Mozilla, and extensions are supported on the Android version too! (in particular, I like uBlock Origin and Dark Background Light Text)

As for the desktop side (in case you need that as well), you have plenty of Firefox-based options as well, like LibreWolf (requires some configuration to disable some of the anti-finger printing stuff though), Zen Browser, and Floorp. Even plain Firefox is better than any Chromium-based options. You might also want to look out of Ladybird, which will use an independent engine (not Blink or Gecko!)