Disable Seen Option In Facebook Chat

Intro

On chatting with someone on Facebook, and the person read your message, it displays ‘seen’ along with the time when message was
read. Actually this is a best feature but sometimes it is problem to it allows your friend to know that your ignoring message from them when you’re not giving reply back.

Disabling seen option is useful for many people who just want to end or skip conversation, pretended to act as you dint saw the message

Steps

GOOGLE CHROME

[1]   Just go to * FB UNSEEN 

                         * CHAT UNDETECTED

[2] Click ADD TO CHROME

MOZILLA FIREFOX

There are two ways in Firefox to disable seen option

[1]   Install Grease Monkey.

[2]  Install FACEBOOK STEALTH

[3]  Done‼

        OR

             [4]CHAT UNDETECTED

To disable or uninstall

[1]  Go to add on ≫ Disable

For Other browsers:

Open your FIREFOX Browser and click CTRL+SHIFT+F

As soon as you click above code then you will find screen capture like below

Then click on 

1.CUSTOM FILTERS option then you can find another option Add Filter Group.

When you click 

2.Add filter group you can find new filter Group having an option Actions.

Click on 

3.Actions then you can see Show/Hide filters.

Again click on Show/Hide filters

Then add below code in right side just like in picture below

For any other browsers other than Mozilla and chrome you just disable seen option by blocking below URL 

/ajax/mercury/change_read_status.php$domain=facebook.com