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Unseen on Facebook TM 1.0.1-signed.1-signed No Restart
by Jack EM
Blocks sending your 'seen' status from being sent to the other party on Facebook.
About this Add-on
Once this add-on is installed, there's nothing really much you need to do. Facebook Unseen is a small add-on that doesn't take up much room, as it only has to block a single line of code to disable read receipts from Facebook.