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/usr/share/xul-ext/websites-integration/install.rdf is in xul-ext-websites-integration 2.3.6+13.10.20130920.1-0ubuntu1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8" ?>

<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">

    <em:id>{2e1445b0-2682-11e1-bfc2-0800200c9a66}</em:id>
    <em:version>2013.09.20.beta</em:version>
    <em:creator>Canonical Ltd.</em:creator>

    <em:type>2</em:type>
    <em:unpack>true</em:unpack>

    <em:name>Unity Websites integration</em:name>

    <em:contributor>Aaron Boodman; http://youngpup.net/</em:contributor>
    <em:contributor>Anthony Lieuallen; http://arantius.com/</em:contributor>
    <em:contributor>Chris Feldmann; http://axlotl.net/</em:contributor>
    <em:contributor>David Schontzler; http://stilleye.com/</em:contributor>
    <em:contributor>Erik Vold; http://erikvold.com/</em:contributor>
    <em:contributor>Gareth Andrew; http://freegarethandrew.org/</em:contributor>
    <em:contributor>Hisateru Tanaka</em:contributor>
    <em:contributor>Jeremy Dunck; http://dunck.us/anabasis/</em:contributor>
    <em:contributor>Jesper Kristensen; &lt;mail&#64;jesperkristensen.dk&gt;</em:contributor>
    <em:contributor>Johan Sundström; http://ecmanaut.blogspot.com/</em:contributor>
    <em:contributor>JP Sugarbroad</em:contributor>
    <em:contributor>Juan Pablo Guereca Alonso</em:contributor>
    <em:contributor>Manpreet Singh</em:contributor>
    <em:contributor>Mark Pilgrim; http://diveintomark.org/</em:contributor>
    <em:contributor>Marti Martz</em:contributor>
    <em:contributor>Matthew Gray; http://mkgray.com:8000/</em:contributor>
    <em:contributor>Matthias Bauer; http://moeffju.net/</em:contributor>
    <em:contributor>Mike Medley; http://sizzlemctwizzle.com/</em:contributor>
    <em:contributor>Nikolas Coukouma; http://atrus.org/</em:contributor>
    <em:contributor>Ori Avtallon</em:contributor>
    <em:contributor>Pak Kei (logo); http://arkidect.com/</em:contributor>
    <em:contributor>Sam Larison; http://samlarison.com/</em:contributor>
    <em:contributor>Sergio Abreu; http://sitedosergio.sitesbr.net/</em:contributor>
    <em:contributor>Tommi Rautava</em:contributor>

    <!-- Firefox -->
    <em:targetApplication>
      <Description>
        <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
        <em:minVersion>9.0</em:minVersion>
        <em:maxVersion>17.*</em:maxVersion>
        <em:maxVersion>18.*</em:maxVersion>
      </Description>
    </em:targetApplication>

  </Description>

</RDF>