You can already do that with https://github.com/eraeco/party.lol https://github.com/eraeco/party.lol (Open Source extension)! It hijacks input/comment areas &

You can already do that with https://github.com/eraeco/party.lol https://github.com/eraeco/party.lol (Open Source extension)! It hijacks input/comment areas & saves your tweet/post to your own personal local archive in the browser, and then encrypts the message so Facebook/Google can't spy on it.