We’re glad you here to know about Unseenly.
This extension and website are made in hurry in 4 days to help people out there looking to hide the seen feature in Facebook chat and messenger.com
We’d like to thank the owner of this git repo. Without his code, Unseenly would not have been possible. We reused his code and developed this Unseenly extension.
Also, we’d like to give credit for the icon we used for Unseenly (though we modified it slightly).
You can use our contact page for any kind of queries and we’ll get back to you as soon as possible.