Just do it yourself with Greasemonkey:

https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/

I use the third-party app Harmonic to browse HN and it has a dark mode. It's quite nice, actually. Though I do think your tone is unusually inappropriate for a feature request.

Why do you think there must be a dark mode version of HN?

Save the earth.

how does dark mode save the earth?

This does not answer your question. I do not know the answer. That said these [1] are the uBlock Origin rules I use. This includes some colors that can be changed to fit anyone's preference.

[1] - https://mirror.newsdump.org/hn-ublock-colors-other.txt

I am using an add-on called "Dark Reader" in firefox.

I suppose it had to come to light eventually. For many years hundreds of people -- from web designers all the way up to the highest Freemasons -- secretly conspired to thwart every attempt to implement dark mode in HN to frustrate you personally. Not funny indeed.

Paint it black. It's just a document from the web and now resides on your computer. Do whatever you like with it! There is no authorian sleepy forcing you to consume it like it was.

that is NOT funny

You're right, it's an honest and straightforward solution.

yes, on desktop. its a "fix", not solution. more like a cheap excuse