$ apt-cache policy xul-ext-ubufox
xul-ext-ubufox:
  Installed: 3.4-0ubuntu0.14.04.1
  Candidate: 3.4-0ubuntu0.14.04.1
  Version table:
 *** 3.4-0ubuntu0.14.04.1 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
        100 /var/lib/dpkg/status
     2.8-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        500 http://cz.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages