A good alternative is Mull available on F-Droid.

Fennec is a great alternative I use.

https://librewolf.net/docs/faq/#will-you-provide-an-android-version-of-librewolf

What do you guys think of Iceraven, is that an alternative?

The Mull browser on F-Droid is similar in concept (privacy-focused FF fork)

I think it would be a very good idea, especially considering that Mozilla doesn't allow sideloading xpi extensions without AMO on firefox mobile, which is very bad since it creates a walled garden like what's on IOS.

Oh yeah also because it can prevent you from getting certain extensions if they aren't availible from the store in your country, as pointed out in the Ublock origin issue here.