Unfortunately, this means a less-than-ideal browsing experience that forces the viewer to leave Firefox, download the PPT, and open a separate application in order to view the content. Just the other day I was reminded of the power of Google Docs viewer.
Google has provided a nice little page that will let you paste in the URL of the PPT in question, and the form generates an email link, a snippet of html to paste the link into a webpage, and the embed code to place the slide show into an existing webpage or blog post.
Check it out: this is a handy little tool!
http://docs.google.com/viewer
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