HOW TO DISABLE SEEN OPTION IN FACEBOOK CHAT
A lot more scripts are available for this trick but unfortunately they did not work for me while testing. So I found a Google chrome extension which worked 100%. Go to settings then extension and scroll down the page and click on Get more extensions. Search for “Facebook unseen”
Facebook Unseen Extension Working Result
Add this extension to your Chrome browser, single click on extension
in browser enables and disable the extension. That’s cool!
Facebook
Unseen Extension
A lot more scripts are available for this trick but unfortunately they did not work for me while testing. So I found a Google chrome extension which worked 100%. Go to settings then extension and scroll down the page and click on Get more extensions. Search for “Facebook unseen”
Facebook Unseen Extension Working Result