It used to (and still could) work in regular Firefox for Android but Mozilla team decided to stop supporting all extensions (they now allow only a couple of handpicked extensions).
It works in "Firefox Nightly" though, but the installation procedure is a bit complicated. I tried it and it works well: https://blog.mozilla.org/addons/2020/09/29/expanded-extension-support-in-firefox-for-android-nightly/
