I have manually installed Quicktime. I have verified the installation by successfully playing a movie at http://trailers.apple.com/. Still, http://www.merriam-webster.com/audio.php?file=test0001&word=test&text=\%CB%88test\ shows an error message: A plugin is needed to display this content. Install plugin... Clicking the button shows that Quicktime is required!!! I recently restored my Windows Registry, so maybe Firefox or Quicktime are getting confused. Nobody should rely on the Registry being correct! I am stuck, like so many others.