Firefox on Android on the other hand (the one the author worked on), IMHO, is simply an inferior product.
This is kinda understandable due to their small team size (and it looks like they're overworking too), but what I didn't get is why they kept revamping it. I don't have a clear timeline, but in my recent memory they at least did it twice.
Also, plenty of "great features" for some reason stay in beta/alpha/nightly forever. This is particularly obvious if you visit /r/Firefox on Reddit frequently; you see "oh for that, just use beta/nightly version!" as answers for help/feature request threads too often. It's like they never finish these features to push into release channel.
Anyway, it's getting harder and harder to stay using Firefox on Android. Especially after they essentially killed the extension ecosystem in Fenix.