Where Has This Been All These Years? Hiding In The Light?

Being officially a low-vision person who has to blow things up to large size to see them on the screen,  I have been led to using dark mode, white letters on a dark background, more and more.  I just installed the Dark Reader extension on FireFox and it's great.  It might extend the time I'm able to use a computer,  if things get much worse.   Wish I'd found it years ago.  Now to see if I can get it on other browsers.