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Go to Extensios Configuration ( Menu -> More tools -> Extensions )
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Enable Developer Mode ( Check the box on top of the Extensions Page )
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Load Unpacked Extension ( click it! )
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Navigate to the directory with these files
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Visit Chrome Flags (enter chrome://flags/ in the address bar)
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Find and enable Developer Tools experiment
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Enable Custom UI themes ( Open DevTools -> Settings (cog) -> Experiments -> "Allow custom UI themes" )
VERSION:
update 2016/03/26: still working fine with Chrome Version 49.0.2623.87
1.4 : compatible with Chromium 44.0.2403.155, Chrome Version 45.0.2438.3
1.3 : compatible with Version 43.0.2357.132