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I have glaucoma in one eye so naturally bright white and bright colors blind me. Any way to adust for my condition?

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Adjust for dark mode on most web sites in my browser and offer the option for dark or light mode?

Adjust for dark mode on most web sites in my browser and offer the option for dark or light mode?

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When you select the built-in Dark theme, or if you install an Add-on dark theme, Firefox usually will signal websites automatically to use a dark theme if they have one. More info:

Change web appearance settings in Firefox

Since that won't cover very many sites, you might want to use an add-on to dark theme websites. This one is in the "Recommended Extensions" program:

https://addons.mozilla.org/firefox/addon/darkreader/

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