Script Summary: Prevents Facebook from sending 'currently typing' and 'seen' chat notifications
Copyright: 2012+, Pierre BOYER
This script allows you to remove Facebook's most retarted feature since the Timeline, namely the 'seen' notifications in the facebook chat.
It prevents Facebook from sending 'currently typing' and 'seen' requests, meaning people won't receive notifications when you start typing or when you view their messages.
Don't feel forced to reply to people anymore !