"Firefox addon that fixes low contrast text when using dark desktop theme"
"A flat dark GTK-theme with ergonomic contrasts. It supports Gnome, Cinnamon, Xfce4, Mate and Openbox."
"It's astounding how many web designers forget to specify a background color on their site."
See also https://ulyssesonline.com/blackletterhead/ + https://github.com/ulyssesr/BlackLetterhead