Quickly Preview User Info

<div><p>Just hover your mouse on an user icon or an user name, <a href= "http://echofon.com/twitter/firefox/">Echofon Firefox</a> can display the user's profile with tooltip.</p> <p><img src= "http://s3.amazonaws.com/entp-tender-production/assets/e3c66f0ea0c23c35ebe06cacb75431de22e55f40/user_info_normal.png" alt="user_info.png"></p></div>