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Firefox is giving Android users a sneak peek at its open extensions
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
I'm not sure that passes a sanity check. Third-party builds and nightly (after jumping through some arbitrary hoops) have been able to install extensions from AMO that aren't officially supported on mobile since fairly shortly after the refactor. While it was possible for extensions to have performance, battery consumption, and compatibility problems specific to Android, that was also true prior to the refactor.
Maybe there's something I'm missing - I'd welcome a link to something rich in technical details.