Actually, you can use it on Android, but it does require using Firefox Nightly[1].
That does come with downsides such as Nightly being less stable and installing extensions requiring some extra setup, so it isn't the best choice for everyone. But I myself am using Stylus (which works perfectly fine) and some other not officially supported WebExtensions on mobile this way and can recommend it if you don't mind the downsides.
That does come with downsides such as Nightly being less stable and installing extensions requiring some extra setup, so it isn't the best choice for everyone. But I myself am using Stylus (which works perfectly fine) and some other not officially supported WebExtensions on mobile this way and can recommend it if you don't mind the downsides.
[1]: https://blog.mozilla.org/addons/2020/09/29/expanded-extensio...