It appears that Apple has fixed the color issue on Safari.
Before Yosemite Safari (but not Firefox) displayed untagged images incorrectly in wide gamut displays. It was so annoying you couldn't use Safari with these displays. Now it appears to be fixed.
Before Yosemite Safari (but not Firefox) displayed untagged images incorrectly in wide gamut displays. It was so annoying you couldn't use Safari with these displays. Now it appears to be fixed.