e.g.:
<feed>
http://rss.slashdot.org/Slashdot/slashdot
</feed>
Specify a URL to an RSS 2.0 or Atom Feed 0.3/1.0 XML file. This element adds the ability to open a dropdown menu with RSS feed titles, descriptions, and links, similar to Firefox RSS bookmarks, which are automatically updated (not user-initiated). This element is optional, and will not be used by most custom searches.
