Hacker News Reader

Firefox's reader mode works great and includes a dark theme.

The icon shows up in the right side of the URL bar, but you can always force it by prepending the URL, e.g. about:reader?url=<url>

https://darkreader.org/

I just turned this off today, after one too many "an extension is slowing this page down" warnings from Firefox, always from Dark Reader. It's a pretty useful addon, but there's enough websites that implement their own dark mode that it's less necessary these days (I hope), and possibly making it not worth the slowdown.

I always edit the CSS style when this site comes up