How Can I Turn Off "Seen By" Messages in Facebook Chat?
More than ever, we live in a read receipt world. Your friends (and enemies) know when you've seen their message. But it doesn't have to be that way in Facebook. There are several extensions that can help you keep your frenemies in the dark. The web apps experts at Stack Exchange offer up some options.
Sep 13, 2013 ... For Chrome, use the extension FB Unseen which blocks the URL (full disclosure: I wrote this extension). If you want, with a little work you can use ...