The glaring white background of Windows and websites is a real problem for older people and people with vision problems, like cataracts. There are ways to change the appearance of almost everything on your platform, especially colors, fonts, and sizes of fonts. I have my Windows 10 laptop set up for a light to medium gray background, black text, and forest green menu and task bars.
I selected those colors for ease on the eyes across my entire platform and apps using a combination of:
(1)
Personalization options in Firebox: Tools---Settings---Fonts and colors.
I think this is the main thing you need because your browser, not the Winnipesaukee Forum, controls what you see on the screen. This will change the background color of all websites to your chosen color. You can easily toggle back and forth between your chosen color and the original color of a website using this Firefox add-on:
https://addons.mozilla.org/en-US/fir...websitecolors/. The shortcut icon can be placed on your menu bar for quick access.
(2)
Winaero Tweaker: https://winaero.com/ I've used this for years. It allows you to change a lot of annoying things, like tiny menu fonts, and for me it has been bug free.
(3)
Personalization menu in Windows 10. Here you can opt for a high-contrast theme and choose your background color. Perhaps this is easier in Windows 11? I would love to see a screenshot of your Windows 11 dark theme.
I can't guarantee that those will work in Windows 11 and it can take quite a bit of trial and error to get everything to your liking.