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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.
There are also Firefox forks, but you have to install apk manually and then extension are easy to download without developer collection
I have fennec f - droid and can't find how to download them easily. What fork are you using?
https://github.com/fork-maintainers/iceraven-browser
Fireforks