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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.
That's nice, maybe they can finally re-enable about:config in the damn thing too. They removed it from mobile Firefox years ago and the lack of it aggravates the hell out of me.
It's available in nightly (and I think dev) builds
If you don't want to use the potentially unstable Nightly, Dev or Beta, you can use Fennec (stable builds with dev features).
probably in normal Firefox too, it's just hidden in all of them