The reftest css-gradients/aja-linear-6a.html fails on OSX and only there. Inspection of the images shows 13 pixels, in a diagonal line within the solid yellow region at the upper left hand corner, that are #ffff00 in the reference but #fefe00 in the test. This is a divergence between a canvas gradient and a CSS gradient, so it might be our bug, but its only showing on OSX makes me think it's more likely to be a Quartz issue. Attached is a tarball containing the parsed-out reftest images and an HTML wrapper that can be used to compare them easily.
Pushed http://hg.mozilla.org/mozilla-central/rev/3190bbe377cd to mark it as only failing on 10.5, since it passes on 10.6. Dunno whether that actually means we should resolve this NOTOURBUG or not, though.
Summary: reftests/css-gradients/aja-linear-6a.html fails consistently on OSX → reftests/css-gradients/aja-linear-6a.html fails consistently on OSX < 10.6
FWIW, I'm on 10.6, and it fails for me consistently as well.
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