Hey, I've been trying to look into this a bit. Which OS (or OSes?) do you see 10-15fps on? Because so far on Mac I'm not seeing any differences compared to Chrome, but I may just be missing it...
The "more details" link goes to a blog post from September 2010, so I suspect the test has been around for a while, but it was still interesting to see that for me (Linux, nVidia 560Ti, 319 proprietary driver), Firefox reported 60+ fps while Chrome reported 24 fps.
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