gecko-dev/editor/ui/composer/content/contents.rdf

<?xml version="1.0"?>
<RDF:RDF xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
         xmlns:chrome="http://www.mozilla.org/rdf/chrome#">

  <!-- list all the packages being supplied by this jar -->
  <RDF:Seq about="urn:mozilla:package:root">
    <RDF:li resource="urn:mozilla:package:editor"/>
  </RDF:Seq>

  <!-- package information -->
  <RDF:Description about="urn:mozilla:package:editor"
        chrome:displayName="Editor"
        chrome:author="mozilla.org"
        chrome:name="editor"
        chrome:localeVersion="0.9.9"
        chrome:skinVersion="1.0">
  </RDF:Description>
  
  <!-- overlay information -->
  <RDF:Seq about="urn:mozilla:overlays">
    <RDF:li resource="chrome://communicator/content/pref/preftree.xul"/>
    <RDF:li resource="chrome://communicator/content/pref/pref-appearance.xul"/>
    <RDF:li resource="chrome://navigator/content/navigatorOverlay.xul"/>
    <RDF:li resource="chrome://messenger/content/mailWindowOverlay.xul"/>
  </RDF:Seq>

  <!-- editor preferences branches -->
  <RDF:Seq about="chrome://communicator/content/pref/preftree.xul">
    <RDF:li>chrome://editor/content/editorPrefsOverlay.xul</RDF:li>
  </RDF:Seq>

  <!-- editor startup pref -->
  <RDF:Seq about="chrome://communicator/content/pref/pref-appearance.xul">
    <RDF:li>chrome://editor/content/editorPrefsOverlay.xul</RDF:li>
  </RDF:Seq>

  <!-- editor items for Navigator -->
  <RDF:Seq about="chrome://navigator/content/navigatorOverlay.xul">
    <RDF:li>chrome://editor/content/editorNavigatorOverlay.xul</RDF:li>
  </RDF:Seq>

  <!-- editor items for Mail -->
  <RDF:Seq about="chrome://messenger/content/mailWindowOverlay.xul">
    <RDF:li>chrome://editor/content/editorMailOverlay.xul</RDF:li>
  </RDF:Seq>


</RDF:RDF>