Been using Firefox on Android for a while now and it's great. Chrome's forced tab groups thing is what pushed me to switch, and it's been mostly great since. Firefox on Android even has proper scroll/fling physics now (they used to have an awful implementation on Android).

Only complaint is text input on some sites is very sluggish and drops letters, notably many of the wikis used by games. But those sites are not exactly optimized either so no idea how much of that is Firefox vs. the site.