How do I just not allow a site to use its own colors?
I.e., as an older user, I cannot deal with my favorite website's choice of barf black for everything.
If I do Firefox Preferences -> Colors and unclick "Allow pages to use their own colors" I am happy!
But unfortunately that affects all sites. Therefore I turn to you, dear reader:
What CSS gives the same effect?
Must I think up a new color for each element, or can I just slash all their stupid colors with just one line of CSS, back to the browser / W3C defaults?