Does this only happen on GiantBomb, or does it happen on other sites, like Vimeo, YouTube, Break, GameTrailers et cetera as well?
Does it happen with both the streaming and progressive option?
Have you tried updating your Shockwave/Flash Player?
You sure there's no Firefox add-ons installed causing problems? Try starting Firefox in safe mode (just type "safe mode" in the search field in the start menu and select "Firefox(Safe Mode)") and see if that helps.
I was thinking performance issue at first, ie playing videos use all available CPU-resources, but since you're running Win7 64 I assume your PC at least meet the minimum spec, which should be more than enough for simple multitasking. Could still be a driver-issue though, but it's more likely to be a fault in either Firefox or a plugin, with my bet on the last. Just to be sure it's not a performance-issue, open up the processes tab in task manager (ctrl+shift+esc) and check if a process is using an unreasonable amount of resources while playing videos.
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