I've been impressed to find literally zero compatibility issues in the last year with it being my primary browser on mobile. Works perfectly with my bank, works with heavy WebRTC apps, etc. It's quite a feat, especially given its market share is so low, and so there are relatively so few users to report feedback.
Does Firefox on Android still reload idle tabs when returning to them?
If I open a page, navigate away from it for a few days, and come back, I do not want the page to reload automatically, ever. Firefox was doing that, Vivaldi does not. I moved to Vivaldi.
I found having the address bar at the bottom of the screen odd, but within a few minutes I realised it was the right way and now having it anywhere else feels wrong on mobile.
Kiwi browser also has ublock (and supports adding any desktop add-on) and still does not crash or slow down like firefox does. I'd really like to use firefox in mobile too but with Kiwi being an option, there's almost 0 reason to use firefox.
If all you need is for apps to open browser window on firefox instead of chrome, you can just disable chrome. That's what I have done and it works fine for me.
They're talking about mobile. Since Apple doesn't let browsers use their own engine, uBlock Origin doesn't work on Firefox for iOS, only on Firefox for Android. On the desktop, it works everywhere.
edit: on Android