No Seen is a free Chrome add-on developed by Diéssica that falls under the category of Browsers and subcategory of Add-ons & Tools. This program allows users to read Facebook messages and view Instagram stories without triggering any "seen" marks or read receipts to their friends.

With No Seen, you can configure the add-on to be enabled only for specific websites of your choice. This gives you the flexibility to control when and where your "seen" status is hidden.

No Seen is a handy tool for those who value their privacy and prefer to browse social media platforms incognito. By using this add-on, you can freely read messages and view stories without worrying about giving away your presence.