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Mozilla restores Firefox add-ons banned in Russia
(www.theregister.com)
This is a most excellent place for technology news and articles.
They can kill access to the Firefox website and prevent people from getting access to the addon (well, okay, if you can manually find an .xpi, and have the technical chops to do so, you can download it elsewhere and install it locally).
Seems like some third-party hosting is in order to support any Rebellion Russians.