It works. It sorts alphabetically by the name of the color, so you might need to take that into consideration when choosing colors, but it does what it says it does.
If you undo, you'll see an artifact where it creates another column (or row, perhaps, in some cases) of color as part of the script process, but it removes that when it's finished running.
Not much more to say - tried it in Chrome and Firefox, and it works fine.
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