Switching between dark pages on Chrome can sometimes lead to a blinding flash of white. This extension tries to preserve background color between page loads, if possible.
For the real Lords of Darkness out there, setting a custom user stylesheet to your preferred color (https://code.google.com/p/chromium/issues/detail?id=1373#c261) will probably be more effective than this extension. The same trick applies to Firefox.
Icon created by Anand A Nair from the Noun Project, CC.