The Intercept verified that all four add-ons are blocked in Russia. If the webpage for the add-on is accessed from a Russian IP address, the Mozilla add-on page displays a message: “The page you tried to access is not available in your region.” If the add-on is accessed with an IP address outside of Russia, the add-on page loads successfully.
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From the article:
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Yes, you’re right about that. If they can get the extension from another source, it can be installed.