title: HTML5 Offline Appcache Updates Not Showing In Firefox
body: <p>I have an index.php file in my docroot.  It produces output that starts with this:</p>
  
  <pre><code>&lt;!DOCTYPE html&gt; 
  &lt;html manifest="manifest.appcache"&gt;
  </code></pre>
  
  <p>The manifest.appcache tells browsers to cache it for offline use.  Again, the relevant parts:</p>
  
  <pre><code>CACHE MANIFEST
  
  #version 8-25-2011
  
  CACHE:
  
  #internal HTML documents
  #this tells the browser to cache the HTML it retrieves from http://example.com/
  /
  
  NETWORK:
  *
  </code></pre>
  
  <p>Offline access is working fine with this setup, but updating is not working as I would expect in Firefox.</p>
  
  <p>In Chrome and Safari, when I update the index.php file and then change a comment in the cache.manifest file, the browsers will grab the new index.php output and use that in the cache.  </p>
  
  <p>However, in Firefox, it seems to not care that I've updated the manifest.appcache file.  I suspect that if I wait long enough, it will update, but I've tried waiting hours.</p>
  
  <p>How can I find and eliminate my caching problem?</p>