This add-on does a great job. I think it's the best among competitors.
I kindly ask the author to add hotkey to enable-disable it, because there's a small number of sites where it's action makes pieces of text less visible.

This is a serious add-on for your eyes that let you get a more visible look with high-contrast black and white text

This is exactly what I've been looking for it makes the text and fonts easier to read. Thank you for making this! Remember to put in a paypal or ko-fi donate button so we can help you out.