Few weeks ago Facebook integrated a new thing in chat. If somebody read your message you'll get "seen" and the exact time when the message is seen. Although sometimes this is a good thing, in some other cases, it can be very bad.
We offer 2 way to simply remove "seen by" on Facebook:
1. Using this Chrome extension, which works only for users of Chrome.
Click "Add to Chrome"
A new window will open, click add.
2. Using Chat Undetected, which you need to install and works for Chrome, Firefox and IE.
Note: If your antivirus is detecting it as a treat, it is not, we use it and it works perfectly fine.