I'm a huge Firefox fan (both on PC and Android) and I think Firefox for Android on ChromeOS is terrible, practically unusable. I know my Chromebook is cheap but Firefox runs ultra slow. It also randomly flickers to a black screen and crashes occasionally.

I don't know if it's just me or this is just how it runs.

It's already weird and clunky on a phone. I do it nonetheless, but I'm experiencing weirdness with pwa's, and of course many apps (sometimes the OS itself) defaults to Chrome for breaking out to web-pages.