2.1/plugins/npapi/install-template.rdf

<?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">
    <em:id>oophm@gwt.google.com</em:id>
    <em:name>GWT Hosted Mode Plugin</em:name>
    <em:version>GWT_OOPHM_VERSION</em:version>
    <em:type>2</em:type>
    <em:targetApplication>
      <Description>
        <!-- Firefox 1.5-3.0 supported -->
        <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
        <em:minVersion>1.5</em:minVersion>
        <em:maxVersion>3.0.*</em:maxVersion>
      </Description>
    </em:targetApplication>

    <!-- Front End MetaData -->
    <em:name>GWT Hosted Mode Plugin</em:name>
    <em:description>A plugin to support hosted-mode development of GWT applications</em:description>
    <em:creator>Google, Inc.</em:creator>
    <em:homepageURL>http://code.google.com/webtoolkit/</em:homepageURL>
    <em:iconURL>chrome://gwt-oophm/skin/icon.png</em:iconURL>

    <em:targetPlatform>Linux_x86-gcc3</em:targetPlatform>
    <em:targetPlatform>Linux_x86_64-gcc3</em:targetPlatform>
    <em:targetPlatform>WINNT_x86-msvc</em:targetPlatform>
    <em:targetPlatform>Darwin_x86-gcc3</em:targetPlatform>
    <em:targetPlatform>SunOS_x86-sunc</em:targetPlatform>

    <!-- TODO
    # prefs dialog

    # replace default about dialog
    <em:aboutURL>chrome://gwt-oophm/content/about.xul</em:aboutURL>

    # updates, see http://developer.mozilla.org/en/docs/Extension_Versioning%2C_Update_and_Compatibility#Update_RDF_Format
    <em:updateURL>https://xxx.google.com/.../update.rdf</em:updateURL>

    # platforms - any others?
    <em:targetPlatform>Darwin_ppc-gcc3</em:targetPlatform>
    <em:targetPlatform>SunOS_sparc-sunc</em:targetPlatform>
    -->

  </Description>
</RDF>