Safari: Highlight Non-Retina images

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It is possible in Safari to highlight non-retina images with a red overlay, this makes it easier to determine if 2x images assets are loading correctly on a retina display. You can enable the hightlight effect with the following defaults write command:

defaults write -g CGContextHighlight2xScaledImages YES

Disable the overlay effect with:

defaults delete -g CGContextHighlight2xScaledImages

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