Accept it or not but facebook is the biggest social networking site s we all know.Facebook created last seen active feature to know other person when you were onlineBut if you dont want to show your friends or relatives :P yo can use this features and hide your last seen.To do that you have to follow below steps1.Open google chrome If you dont have chrome download it.If you are using other browser and hide last seen on that I will explain it end of this article
After opening google chrome here we have to add extension named "facebook unseen"Click here to add extensionAfter you click on link you will redirected to a page that says "Facebook Unseen"After that you have to click on on that blue button says "Add to chrome" after click on that button it will take less that 5 sec to install
Once you are done with installation Open your facebook and enjoy your last seen feature
How To Hide last Seen In Mozilla Firefox
If you use looking for any extension for hiding Facebook messages last seen or read status on Mozilla Firefox browser then Facebook Message Seen Disable is the right plugins for you.
Facebook Message Seen extension disables Facebook messages seen status and last active time of Facebook automatically for your account so that your friends can’t find if or when you have read their messages.