window.applicationCache.status never only returns 0 or 1

  function onUpdateReady(){
   window.applicationCache.swapCache();
  }
  window.applicationCache.addEventListener('updateready', onUpdateReady);
  if(window.applicationCache.status === window.applicationCache.UPDATEREADY){
   onUpdateReady();
  }

 I should mention that this is what my .htaccess file looks like:

AddType text/cache-manifest .manifest
ExpiresActive On

<Files index.html>
Header append Cache-Control "public, must-revalidate"
</Files>

I have am using a manifest file to cache pages for a web app. By changing the version # in my manifest file updates are then pushed to apps in Chrome, Safari, and IE....but not in Firefox. I got this chunk of code directly from a Mozilla forum: <pre><nowiki> function onUpdateReady(){ window.applicationCache.swapCache(); } window.applicationCache.addEventListener('updateready', onUpdateReady); if(window.applicationCache.status === window.applicationCache.UPDATEREADY){ onUpdateReady(); } </nowiki></pre> I used jQuery to alert window.applicationCache.status, which in Firefox only returns either 0 or 1....never 4 as it should when a change to the manifest file has been made. Am I missing something, or is this a bug? I should mention that this is what my .htaccess file looks like: <pre><nowiki>AddType text/cache-manifest .manifest ExpiresActive On <Files index.html> Header append Cache-Control "public, must-revalidate" </Files></nowiki></pre>