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dark-background-light-text-extension
Firefox addon that turns every page colors into "light text on dark background"
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Dark mode is actually too stark a contrast and wears on my eyes. I have an addon that I can choose the colors. I have a dark gray background with green text and it is way better than having a 27" white light flashlight shining in my face for 10 hours a day. Everyone is different, choose what works for you. https://github.com/m-khvoinitsky/dark-background-light-text-extension