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Only late Retina display may have a wide enough gamut, so it's still possible that Firefox throws away the color profile (and therefore shows both reds as different, yet inaccurate), while Safari handles it (and therefore collapses the reds to 255).

"Debugging" color settings is tricky, because it can be hard what goes wrong along the chain, and what you end up observing may be counterintuitive.

EDIT: I observe the same behaviour than you on my early 2013 13" Retina MBP. Firefox seems to ignore the color profile on the red image while every other app doesn't (including downloading the image and using Preview). Other images, notably the Iceland one, highlight that my screen does have a wider gamut in some color areas, maybe just not in the red.

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