Comment 18 for bug 133124

If the proprietary nvidia drivers hide the problem, it is probably because of differences in the extensions or visuals/pixel formats supported by the two drivers.

In a number of cases, Cairo provides fallbacks if the X server doesn't support a particular feature. So it is likely that different code paths are being executed when run under the different drivers.

For reference, I am seeing the same crash on my AMD64 system which has an ATI Radeon 9200 SE (using the Free drivers).