Here's a JS bookmarklet I use to apply dark mode to any website. It tries to preserve colors and avoids inverting graphics. Add a new bookmark to your toolbar and paste in that JS in place of the link. I hope you find it useful!

https://gist.github.com/mpetrovich/b3e4ec291d21bbdbe17b1adf4...

>I just want HN in dark mode....

Dark Reader extension for Firefox, works on mobile and desktop. I constantly forget this setup and blinds myself when I access HN from elsewhere.

I use an alternative front end to Hacker News https://hn.premii.com

You can adjust the theme to your liking and I find it actually quite pleasant. No subscription, no login, mobile friendly and it has been stable and online for several years.

Dark Reader Mode for Firefox works well for me! ;)

I would be surprised if nobody already created a plugin for firefox/chrome that adds dark mode honestly