I'm not necessarily asking you, but I'm taking your message as an opportunity to ask if anyone knows of an extension that does the opposite? I have pretty bad

I'm not necessarily asking you, but I'm taking your message as an opportunity to ask if anyone knows of an extension that does the opposite? I have pretty bad astigmatism, and I cannot read pages with dark background. There used to be an extension I used for this purpose, but it stopped working several years ago, and I have suffered ever since. Going into developer mode to play around with the stylesheet works, but is a huge hassle.