EDITED

First, check here to make sure you are displaying images by default:

orange Firefox button or Tools menu > Options > Content > check "Load images automatically"

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Also, it often helps solve strange web site problems to clear your Firefox cache.

orange Firefox button or Tools menu > Options > Advanced

On the Network mini-tab > Offline Storage : "Clear Now"

well, i'll be that worked (O: thanks so much i'll have to remember that one

thank you soo much!! all the pages on my firefox has been doing this for 2 days now! super frustrating as i hate internet explorer!! thank you soooo much!! =D

I had the same problem here. I disabled all add-ons and was almost ready to give up on Firefox. I cleared my cache and !Voila! problem solved. Thank You.