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Is there any way by which we can blacken all the sites which we open with a BLACK background color?

I have tried Stylish addon for Firefox. But I want to do it for many other sites like Google News, Google Maps and even Stack Overflow or Super User?

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Just to satisfy my own curiosity, why would you want to do that? – BloodPhilia Jun 28 '10 at 10:06
up vote 1 down vote accepted

This userstyle is enabled for all pages by default: myfavolours. Related one two three.

I've asked about using colour profiles to achieve something similar, but that hasn't been done yet.

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This should do the trick.

tools > options > content > colors > background

also uncheck the "allow pages to choose their own colors".

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