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[Profile]/extensions/smtpswitch@ratm.homeip.net/defaults/preferences/smtpswitch.js
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/usr/share/mozilla/extensions/{3550f703-e582-4d05-9a08-453d09bdfdc6}/calendar-timezones@mozilla.org/defaults/preferences/preferences.js
/usr/share/mozilla/extensions/{3550f703-e582-4d05-9a08-453d09bdfdc6}/calendar-timezones@mozilla.org/defaults/preferences/000system.js
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[Profile]/extensions/{e2fda1a4-762b-4020-b5ad-a41df1933103}/defaults/preferences/lightning.js