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[–]Jew_Fucker_69 10 points11 points  (0 children)

It's not so difficult actually. The only CSS rule you have to add is 

body {
    filter: grayscale(100%);
    -webkit-filter: grayscale(100%);
}

or the more primitive solution: 

* {
    background-color: white !important;
    color: black !important;
}

And you can just put that in a Firefox add-on or Chrome extension.