Sample DevTools theme. Enable DevTools experiments in about:flags, then open DevTools and toggle "Allow UI themes" experiment.
Rainbow DevTools Theme Extension
Rough details here: https://code.google.com/p/chromium/issues/detail?id=318566#c33
Source: https://github.com/paulirish/sample-devtools-theme-extension
Source Manifest.json
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User reviews
Grace Paquette (ID: 0000001df5080540) Voted 1 ★ - Updated 02/18/2015
Rocco Georgi (ID: 000000ce97bf8fb6) Voted 4 ★ - Updated 12/01/2013