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/usr/lib/xul-ext/lightning/install.rdf is in xul-ext-lightning 1.3+build1-0ubuntu1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0"?>

<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>11.0</em:minVersion>
        <em:maxVersion>11.*</em:maxVersion>
      </Description>
    </em:targetApplication>

    <em:targetApplication>
      <Description>
        <!-- seamonkey -->
        <em:id>{92650c4d-4b8e-4d2a-b7eb-24ecf4f6b63a}</em:id>
        <em:minVersion>2.8</em:minVersion>
        <em:maxVersion>2.8.*</em:maxVersion>
      </Description>
    </em:targetApplication>

    <em:id>{e2fda1a4-762b-4020-b5ad-a41df1933103}</em:id>
    <em:name>Lightning</em:name>
    <em:version>1.3</em:version> <!-- BuildID=20120308163635 -->
    <em:description>An integrated calendar for Thunderbird</em:description>
    <em:creator>Mozilla Calendar Project</em:creator>
    <em:homepageURL>http://www.mozilla.org/projects/calendar/releases/lightning1.3.html</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>
  </Description>
</RDF>