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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.
Aside from blocking the add-ons site, they might block the update servers. Linux wouldn't be affected I think (unless they block rpm, apt... As a whole), but on windows I think it updates from Firefox servers directly.
There are probably ways around it, but it's a burden for the windows users.