Not quite what you suggested, but achieves some of the same things https://addon... | Hacker News

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morganw on Dec 16, 2011 | parent | context | favorite | on: In case SOPA passes: IP addresses of popular websi...

Not quite what you suggested, but achieves some of the same things https://addons.mozilla.org/en-US/firefox/addon/mafiaafire-re...

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