/usr/lib/xul-ext/lightning/components/calTimezoneService.manifest is in xul-ext-lightning 1.3+build1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | component {e736f2bd-7640-4715-ab35-887dc866c587} calTimezoneService.js
contract @mozilla.org/calendar/timezone-service;1 {e736f2bd-7640-4715-ab35-887dc866c587}
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