/etc/firefox/syspref.js
prefs.js
user.js
/usr/share/mozilla/extensions/{ec8030f7-c20a-464f-9b0e-13a3a9e97384}/ubufox@ubuntu.com/defaults/preferences/dist.js
/usr/share/mozilla/extensions/{ec8030f7-c20a-464f-9b0e-13a3a9e97384}/ubufox@ubuntu.com/defaults/preferences/ubufox-pfs.js
/usr/share/mozilla/extensions/{ec8030f7-c20a-464f-9b0e-13a3a9e97384}/ubufox@ubuntu.com/defaults/preferences/ubuntu-mods.js
/usr/share/mozilla/extensions/{ec8030f7-c20a-464f-9b0e-13a3a9e97384}/ubufox@ubuntu.com/defaults/preferences/ubufox.js
/usr/share/mozilla/extensions/{ec8030f7-c20a-464f-9b0e-13a3a9e97384}/ubufox@ubuntu.com/defaults/preferences/000system.js
[Profile]/extensions/https-everywhere@eff.org/defaults/preferences/preferences.js