This is a theme for the Developer Tools [CTRL/CMD + SHIFT + I]. Installation Instructions --------------------------------------------------------- - Add this theme - Goto chrome://flags/#enable-devtools-experiments and Enable Developer Tools experiments. Select [Relaunch Now] at the bottom of the page. - Open developer tools settings, select Experiments tab, and check 'Allow custom UI themes'. - Open developer tools settings, in the Preferences switch Theme to the Dark. - Reload devtools.