@DigitalDame: I have always had the same problem. Videos on gamespot are unwatchable. I'm using the latest version Firefox with Windows 7 (64bit) fully patched. If I run the same video on youtube (i.e https://www.youtube.com/watch?v=z_342Try_sk) which you have on your gamespot too, everything's fine and it plays beautifully in HD (1080p). On gamespot it's choppy and my CPU jumps to around 40% but on youtube with the same video the CPU is around 5-10%. AND this is after disabling all AdBlock/Ghostery plugins etc etc. What's going on?