well, it significantly mangles things on The Guardian. basically, all of the little "NSA" tags in this article: http://www.theguardian.com/commentisfree/2013/sep/05/governm...

get wiped out, making the text difficult to understand.

Also, be careful to wait for it to work. I didn't think it worked and clicked it a second time. I ended up with funfetti colors, not smooth gradients.