Were you fucking around on any of those 'MAKE FIREFOX FASTER!' pages? You know, the ones that break TCP/IP specs and really beat the shit out of a webserver so you get your stroke material two miliseconds faster?
If not, have you un/reinstalled QuickTime? It loves to take over for PNGs.
Alternatively, since it seems to only be FF, this probably isn't it, but check your router's MTU.
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