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/usr/lib/lightning/install.rdf 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.

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<?xml version="1.0"?>
<!-- This Source Code Form is subject to the terms of the Mozilla Public
   - License, v. 2.0. If a copy of the MPL was not distributed with this
   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->


<RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
     xmlns:em="http://www.mozilla.org/2004/em-rdf#">

  <Description about="urn:mozilla:install-manifest">
    <!-- Target Application this extension can install into,
        with minimum and maximum supported versions. -->
    <em:targetApplication>
      <Description>
        <!-- thunderbird -->
        <em:id>{3550f703-e582-4d05-9a08-453d09bdfdc6}</em:id>
        <em:minVersion>52.8.0</em:minVersion>
        <em:maxVersion>52.*</em:maxVersion>
      </Description>
    </em:targetApplication>

    <em:targetApplication>
      <Description>
        <!-- seamonkey -->
        <em:id>{92650c4d-4b8e-4d2a-b7eb-24ecf4f6b63a}</em:id>
        <em:minVersion>2.49.4</em:minVersion>
        <em:maxVersion>2.49.*</em:maxVersion>
      </Description>
    </em:targetApplication>

    <em:id>{e2fda1a4-762b-4020-b5ad-a41df1933103}</em:id>
    <em:name>Lightning</em:name>
    <em:version>5.4.8</em:version> <!-- BuildID=20180522213040 -->
    <em:description>Integrated Calendaring &amp; Scheduling for your Email client</em:description>
    <em:creator>Mozilla Calendar Project</em:creator>
    <em:homepageURL>https://www.mozilla.org/projects/calendar/</em:homepageURL>
    <em:iconURL>chrome://calendar/skin/cal-icon32.png</em:iconURL>
    <em:optionsURL>chrome://messenger/content/preferences/preferences.xul</em:optionsURL>
    <em:targetPlatform>Linux_x86_64-gcc3</em:targetPlatform>
    <em:unpack>true</em:unpack>
    <em:strictCompatibility>true</em:strictCompatibility>
  </Description>
</RDF>