Unfortunately, Reader Mode in Firefox doesn't work for all pages, only pages that have markup that it understands.[1] I use a Firefox extension called "Dark Ba

Unfortunately, Reader Mode in Firefox doesn't work for all pages, only pages that have markup that it understands.[1] I use a Firefox extension called "Dark Background and Light Text"[2] that lets you override the foreground/background colors for HTML pages. (Despite the name, you can pick whatever colors you like. And you can selectively enable/disable it based on the domain.) Another similar extension, that's also available for Chrome, is "Dark Reader".[3] But its colors are not configurable. Both of these extensions are open source. [1] There was actually an interesting article the other day on how Reader Mode works: https://news.ycombinator.com/item?id=30864311 https://news.ycombinator.com/item?id=30864311 [2] https://addons.mozilla.org/firefox/addon/dark-background-light-text https://addons.mozilla.org/firefox/addon/dark-background-lig... [3] https://addons.mozilla.org/en-US/firefox/addon/darkreader https://addons.mozilla.org/en-US/firefox/addon/darkreader or https://chrome.google.com/webstore/detail/dark-reader/eimadpbcbfnmbkopoojfekhnkhdbieeh https://chrome.google.com/webstore/detail/dark-reader/eimadp...