/usr/lib/mozilla/plugins:
  => flashplugin-alternative.so
     - symlink to /etc/alternatives/mozilla-flashplugin
     - symlink to /usr/lib/flashplugin-installer/libflashplayer.so
        (size: 19248240 bytes, mtime: Thu Jun 11 07:48:34 2015)
  => libvlcplugin.so
        (size: 161984 bytes, mtime: Wed Jul 30 00:15:20 2014)
  => libjavaplugin.so
     - symlink to /etc/alternatives/mozilla-javaplugin.so
     - symlink to /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so
        (size: 630168 bytes, mtime: Fri Nov 28 06:18:52 2014)

/usr/lib/xulrunner-addons/plugins: