The extension "Sexy Undo Close Tab" is known to be adware or malicious, please use caution.
1. Risks Detail:
This item have been removed by its author or chrome.
Take care of these extensions which is taken down from chrome webstore! Most of them are dangerous!
2. User's Comments:
Details see here http://www.hkepc.com/forum/viewthread.php?tid=1771201
Take care of these extensions!