Technically, I see nothing wrong with the page. I'm sifting the Firefox knowledgebase and have two hits that are worth checking on your system (especially the Skype-eBay add-on).
http://support.mozilla.com/en-US/kb/The+image+cannot+be...e+it+contains+errors
http://support.mozilla.com/en-US/kb/Images+or+animations+do+not+show
Are you using new Firefox 3 or an older release?
Danno