/usr/lib/lightning/components/calCompositeCalendar.manifest is in lightning 1:52.8.0-1~deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | component {aeff788d-63b0-4996-91fb-40a7654c6224} calCompositeCalendar.js
contract @mozilla.org/calendar/calendar;1?type=composite {aeff788d-63b0-4996-91fb-40a7654c6224}
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