After the recent Firefox incident I realized how I lied to myself by believing that I'm secure just by using Linux.  My setup is Ubuntu 14.04 LTS (job requirement) with XFCE.  So here's my question: What is the best Linux sandbox available right now?  Even better if it's something simple to use and battle tested.  Main things I would like to sandbox is Firefox, Thunderbird, Wine, Torrent stuff and maybe Chrome (is it necessary?  my chrome://sandbox shows YES to everything except "SUID Sandbox")