title: OpenSearch not working in Firefox: "Firefox could not download the search plugin from"
body: <p>While testing to ensure OpenSearch works for my site I receive the error, "Firefox could not download the search plugin from:" after clicking the search provider to add it to Firefox.</p>
  
  <p>Here is the source for my OpenSearch looks like...</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/" xmlns:moz="http://www.mozilla.org/2006/browser/search/"&gt;
  &lt;ShortName&gt;Example&lt;/ShortName&gt;
  &lt;Description&gt;Search www.example.com&lt;/Description&gt;
  &lt;Image height="16" width="16" type="image/vnd.microsoft.icon"&gt;http://www.example.com/favicon.ico&lt;/Image&gt;
  &lt;InputEncoding&gt;UTF-8&lt;/InputEncoding&gt;
  &lt;Url method="get" template="http://www.example.com/search/?q={searchTerms}&amp;#38;source=opensearch" type="application/xhtml+xml" /&gt;
  &lt;/OpenSearchDescription&gt;
  </code></pre>
  
  <p>What am I doing wrong that is generating this error?</p>