/usr/lib/thunderbird-addons/extensions/{e2fda1a4-762b-4020-b5ad-a41df1933103}/components/calBackendLoader.manifest is in xul-ext-lightning 1:24.4.0+build1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | component {0314c271-7168-40fa-802e-83c8c46a557e} calBackendLoader.js
contract @mozilla.org/calendar/backend-loader;1 {0314c271-7168-40fa-802e-83c8c46a557e}
category profile-after-change calendar-backend-loader @mozilla.org/calendar/backend-loader;1
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