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Few days ago I read about an addon that prevents my friend from seeing whether I read his message or not on Facebook. What is that addon called?

Please, need help fast! Thank you!

Hama Charieg
2012-09-13 14:04:04
FB Unseen for google chrome https://chrome.google.com/webstore/detail/ihcedcpmfdpjijiamkaeaefgfagnnpei
susendeep dutta
2012-09-13 07:43:23
Chat Undetected -http://crossrider.com/install/14917-chat-undetected