Maybe give Iceraven a try. Its a FF Android fork and works with lots of add ons that regular FF android does not offer for some reason.
https://github.com/fork-maintainers/iceraven-browser
Edit:
To be clear, Iceraven does not magically make all add ons usable. But more than regular FF android anyway. From their Readme:
Our goal is to be a close fork of the new Firefox for Android that seeks to provide users with more options, more opportunities to customize (including a broad extension library), and more information about the pages they visit and how their browsers are interacting with those pages.
Notable features include:
about:configย support
- The ability toย attemptย to install a much longer list of add-ons than Mozilla's Fenix version of Firefox accepts. Currently the browser queriesย this AMO collectionย Most of them will not work, because they depend on code that Mozilla is still working on writing inย
android-components, but you may attempt to install them. If you don't see an add-on you want, you canย request it.