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/usr/share/xul-ext/ubiquity/standard-feeds/firefox.html is in xul-ext-ubiquity 0.6.4~pre20140729-1.

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<?xml version="1.0"?>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"
      xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
<head>
  <title>Ubiquity Standard Firefox Commands</title>
  <link rel="commands" href="firefox.js"/>
</head>
<body>
<p>This feed contains Firefox-specific commands.</p>
</body>
</html>