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Where do you get this error, in firefox? Are you on the latest version of Firefox? Do you have the latest Video drivers, and flash version (I assume you just installed this stuff so probably yes, but it's always good to make sure.) Might also want to try disabling all background programs, any kind of system utilities, etc. temporarily to see if one of them is conflicting..
I have experienced lots of lag with Firefox and Adobe Flash hardware acceleration on nVidia. I should be getting my 6990 back today, so we'll see if the issues are nVidia specific or something to do with Flash and Windows 8.