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Blocks sending your 'seen' status from being sent to the other party on Facebook messaging.
NOTE: If you open the other party's inbox, the 'seen' status will still be sent.
Source code can be found on https://github.com/tangrs/unseen-extension
About this Add-on
This extension simply blocks sending your 'seen' status from being sent to the other party.
Known problems, limitations, source code and more can be found on https://github.com/tangrs/unseen-extension