FB Unseen - Blocks the ”seen” feature of the facebook messenger

• https://fbunseen.com/
• https://chrome.google.com/webstore/detail/unseen/jiomcgpfgkeefipihnplhadgdoollmap?hl=en
• http://fbunseen.com/contribute
• https://github.com/swege/fb-unseen
• https://twitter.com/fbunseen