I've tried to add blocking for groups, however have not testet it yet.
Facebook has a new feature where the other party is notified once you read their message. Sometimes you may not want this for privacy reasons.
This extension simply blocks sending your 'seen' status from being sent to the other party.
Bug reports can be sent to tangrs at tangrs.id.au
If you open the other party's inbox, the 'seen' status will still be sent.
Since it indiscriminantly blocks the 'seen' status from being sent, it means Facebook won't know you've read the message either and will probably show a notification on your inbox icon.
This plugin comes with no warranty or guarantees blah blah blah... You're using this at your risk and I can't be held responsible for any social awkwardness or otherwise caused by the potential failure of this extension.
Licence is the Mozilla Public License version 2.0.
Run ./build.sh in this directory.