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>{C8534C26-F59A-11DA-9804-B622A1EF5492}</em:id>
    <em:name>Folder Account</em:name>
    <em:version>9.0</em:version>
    <em:creator>Christopher Eykamp</em:creator>
    <em:description>Associate an account or identity with a particular folder</em:description>
    <!--
        No options yet
        <em:optionsURL>chrome://folderAccount/content/options.xul</em:optionsURL>
    -->
    
    <em:targetApplication>
      <Description>
        <em:id>{3550f703-e582-4d05-9a08-453d09bdfdc6}</em:id> <!-- thunderbird -->
        <em:minVersion>3.0b3</em:minVersion>
        <em:maxVersion>60.*</em:maxVersion>   <!-- https://addons.mozilla.org/en-US/firefox/pages/appversions -->
      </Description>
    </em:targetApplication>
    
    
  </Description>
</RDF>