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Firefox to become first mobile browser to support desktop extensions later this year
(blog.mozilla.org)
This is a most excellent place for technology news and articles.
I think I read that it previously supported full blown extension and they removed it due to some under the hood changes.
It did, legacy versions of it had almost full extension support and also even allowed you to install them from storage as xpi files and poke around about:config, then they took away both of those things completely in fenix (only allowing about:config in debug versions and blocking XPI install altogether).
Nothing to do with this thread just saying hello o7