To add another datapoint: It works fine here. Browser: Iceweasel-libre 27.0.1 OS: Parabola GNU/Linux-libre (i686) GPU: Integrated Intel (specifically, device

To add another datapoint: It works fine here. Browser: Iceweasel-libre 27.0.1 OS: Parabola GNU/Linux-libre (i686) GPU: Integrated Intel (specifically, device code 14c0:005a) Driver: 'i915' module I sort of suspect that it is a "crappy driver" that works fine in all common cases, but has a bug in a seldom used feature.