I'd like to suggest adding an additional setting related to page rendering. Specifically, changing the page's default color tone (for example: "Disabled" - standard display; "Custom"; "Darkened" - #242424; "Black" - #000000). Any third-party solutions would consume more resources for such changes. In my case, because I use an OLED monitor, I use an extension to change the default color tone to #000000. Reading information on various pages, whether Wikipedia or local resources, is much more enjoyable, especially late at night.
Example as a screenshot below