Wow. Looks like none of ya have replied yet. Oh well... guess I can always uninstall my copy and go back to IE; maybe even tell my friends about how buggy Firefox is.

"Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now" "Remove the Cookies" from sites that cause problems: Tools > Options > Privacy > Cookies: "Show Cookies"

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes). See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems

See also: Website colors are wrong Websites look wrong or appear differently than they should

I had a similar problem, with the images not wanting to load right/at all, but it would load the background for the site. I'm not sure why, but clearing out the offline cache seems to have fixed it...

I've been having this problem a lot recently as well, but clearing the cache doesn't seem to be a permanent fix. Within a day it starts up again, and when it's working moderately, the pictures won't load up, either having a weird page-like icon on the top left or the deviantART symbol across it and won't show until I take the actual photo url and put it in a new tab. Solutions?