How can I turn all colours of web pages into simple black and white, on my web browser?
Which browsers support this (Chrome, Internet Explorer, or Firefox)?
Is this even possible?
I found this nice blog entry which explains how to do it in both IE and other browsers:
"“Grayscaling” in non-IE browsers" (James Padolsey)
The basics for IE specifically:
You'll want to make a custom CSS file and use that in the browser to apply to all pages (look into IE's Accessibility options).
The blog has a demo page for it, and you can download the JS script from there.