Aw man I just started using Brave on my Android phone and really enjoy using it's AdBlock features and forced dark mode on pages that don't support it yet.
I tried Firefox and they didn't have an option to force dark mode on webpages without me having to turn this in in developer mode which breaks other apps I use.
There's a Dark Reader extension that will do that for you, if you have fdroid I'd also recommend grabbing Fennec instead which deblobs Firefox, changes some bad defaults, and enables about:config