Disable Seen in Facebook

Most of us are finding ways to stop "Seen" option in Facebook chat. when someone sends a message on Facebook and we open it whether it is important or not the sender has "Seen" text in his chat box that means the reader has seen the message. Mostly people don't want to stop this irritating thing because when we are busy we may not like anyone to disturb us. Here is the solution to stop this thing in Facebook chat.

Here is the Extension/Addon for chrome or firefox. By using this Extension you can Disable Seen in Facebook chat.
Follow the following link and install the Extension in Chrome
https://chrome.google.com/webstore/detail/fb-unseen/ihcedcpmfdpjijiamkaeaefgfagnnpei

And if you are using Firefox you have to install Grease Monkey Addon. follow the link below

https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/

Than after you have installed the Addon go to the following page and install the script

http://userscripts.org/scripts/show/136261

Enjoy !! Feel free to comment.