sergio@sergio-Inspiron-N5110:~$ sudo updatedb;locate plugins | grep -i lib/firefox | grep -v search
/home/sergio/.local/share/Trash/files/adobe-flashplugin_11.2.202.235-0oneiric1_amd64/usr/lib/firefox/plugins
/usr/lib/firefox/plugins
/usr/lib/firefox-addons/plugins
sergio@sergio-Inspiron-N5110:~$