My guess is that the apple store isn't designed to work with firefox. If the images show up in other browsers then it'll be a problem with firefox basically.
I don't use it personally so i don't know much about it, try perusing the settings/options for firefox, there might be something that'll fix the problem!
Firrefox 1.5.0.1 on this end. I can not find a page on the Apple Store where an Image does not load. Is everything fine with Safari on your end with Apple?
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