/usr/lib/thunderbird-addons/extensions/{e2fda1a4-762b-4020-b5ad-a41df1933103}/components/lightningTextCalendarConverter.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 {c70acb08-464e-4e55-899d-b2c84c5409fa} lightningTextCalendarConverter.js
contract @mozilla.org/lightning/mime-converter;1 {c70acb08-464e-4e55-899d-b2c84c5409fa}
category simple-mime-converters text/calendar @mozilla.org/lightning/mime-converter;1
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