This seems to happen to some users
Michal is it correct that your vendor/device id doesn't show up in about:support?
On my Mac Mini (3,1), Vendor and Device ID are both "0000", and Adapter Description is "0x22600,0x20400" It gets the right info for the WebGL line though (correctly identifies it as an GeForce 9400M)
I just remembered that this is a known limitation.
@Jeff: Yes, my Vendor @ Device ID are both 0000. See a screenshot from my MacBookPro7,1 for details - with info from System Profiler on top. Interestingly, my Adapter Description is also 0x22600,0x20400 although it's a different NVidia Model (GeForce 320M).
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