I really would love it if browsers would provide UI that allows the user to configure the colour scheme (light/dark/auto) and contrast (less/more/auto) globally *and* per site.
Feels like an obvious win, now that there are CSS media queries for these (https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme and https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-contrast).
Why does every site have to write JS and reinvent configuration storage when the browser is right there, reading this stuff? Could we do it in one place?