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Google tries to defend its Web Environment Integrity
(techreport.com)
This is a most excellent place for technology news and articles.
It's kind of silly. I use nightly with custom add-ons and most of the add-ons work without issue. The UI might not be the best for the phone but they're functional. I'm not sure why the mobile add-ons are so restricted, even enabling them in nightly is bizarre. You need to go in and tap on the FF icon in the version info page or something like that...