I hate white background on web pages! (Score 1)

At the moment it is possible to configure mozilla to always change the page background to whatever colour you want (I use white text on dark grey background). But this is not good enough as all colour information is lost (immaging that there is a list of entries on the page and some of them are red because they have changed - you can not see that because you've replaced all the colours with your colour!). What would be the perfect solution is to enable Mozilla to be configured to something like "dark background mode" when the browser itself will change the colours to the similar ones but visible on dark backround, i.e. black to white, dark red to light red, light red to dark red... etc. I think links browser does something similar.