Yeah, if only their dev made a fix to allow sideloading in mobile firefox (asked about it on the github and he refused). That's one of the things I'd hope LibreWolf on android could do, just let me install a damn xpi file from internal storage already, I don't want to be forced to use AMO and their stupid extension lists thing, just want to install any extension I choose, bugs be dammed, whether Mozilla approves it or not.
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.