Do you find yourself highlighting text?

I read a lot of PDFs and webpages, but what strikes me is the colour schemes are often unsuitable for reading. Take the standard black text on white background, there has been research showing that applying a blue or other filter to the page makes the tones easier to see and thus easier to read. At present I find myself highlighting the text to give it a blue highlight rectangle!

So.. now we just need an easy way to change PDFs and webpages colour schemes to fit what we want. Its not difficult, so someone will do it eventually.. just like I've done custom userContent.css code to remove adverts we could change the colours. Perhaps even Greasemonkey can do it.. ah, yes we have Page recolourisation just what I was thinking!