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Firefox will support at least 200 new extensions on Android this December
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
https://www.androidpolice.com/install-add-on-extension-mozilla-firefox-android/
The option to install any extension has always been possible it's just a tad more work to get setup.
I did this ages ago, I just add the extensions I want to the list and then they appear to let me install them