/usr/lib/thunderbird-addons/extensions/{e2fda1a4-762b-4020-b5ad-a41df1933103}/components/calItipProtocolHandler.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 4 5 6 7 8 | component {643e0328-36f6-411d-a107-16238dff9cd7} calItipProtocolHandler.js
contract @mozilla.org/calendar/itip-channel;1 {643e0328-36f6-411d-a107-16238dff9cd7}
component {6e957006-b4ce-11d9-b053-001124736B74} calItipProtocolHandler.js
contract @mozilla.org/network/protocol;1?name=moz-cal-handle-itip {6e957006-b4ce-11d9-b053-001124736B74}
component {47c31f2b-b4de-11d9-bfe6-001124736B74} calItipProtocolHandler.js
contract @mozilla.org/uriloader/content-handler;1?type=application/x-itip-internal {47c31f2b-b4de-11d9-bfe6-001124736B74}
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