install.rdf

<?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="toolbar@experiments.addons.mozilla.org"
               em:name="Toolbar API"
               em:type="256"
               em:version="0.1"
               em:description="Toolbar API used to add a toolbar to Firefox"
               em:creator="Mozilla">
    
    <em:targetApplication>
      <!-- Firefox -->
      <Description em:id="{ec8030f7-c20a-464f-9b0e-13a3a9e97384}"
                   em:minVersion="50.0"
                   em:maxVersion="*"/>
    </em:targetApplication>
  </Description>
</RDF>