I use FF Android every day, including watching videos, and haven't noticed the "unstable garbage pile". Are you being hyperbolic?
Still, I won't browse the web without uBlock Origin, so Firefox is here to stay.
I used to have much more minor issues that are somewhat similar to what you describe, but they've been fixed for the last year or so. (I run Nightly all the time, on Linux, and generally have remarkably few issues with it.)