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Unseenly extension is for hiding the seen feature in Facebook chat. Currently this extension will work on www.facebook.com, m.facebook.com and messenger.com
All you have to do is just install the extension and you are good to go. You can easily toggle the extension ON and OFF by clicking the unseenly icon from your extensions list.
This is completely free, secure and free from malware and no unwanted pop-ups.
Not working anymore
did not hide my seen
Please, update to new facebook and messenger version!
No popups ?
the moment I installed it opened about 20 popups
no thanks