This is really an annoying feature for many people. This lets the other end user know that you have read the message he/she sent to you. Facebook informs the other end about the receipt of all messages. This feature will make a bad feeling to other end when we do not reply to their messages. So, this is one of the most wanted trick to stay undetected from this ‘Seen’ feature. It’s a browser extension that works well in Mozilla
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