The number of tested extensions supported in Firefox for Android is growing and in the meantime you can install any extension from addons.mozilla.org in Firefox Nightly for Android:
https://blog.mozilla.org/addons/2020/09/29/expanded-extensio...
https://blog.mozilla.org/addons/2020/09/29/expanded-extensio...
That was done after much screaming, and there are no plans to ever bring that out of Nightly.