I use dark reader, but I just know one day I'll wake up to news that it had secretly been sold a month prior and had been doing all kinds of nefarious things. This is inherently a problem with browser extensions that both auto-update and basically require access to every website.
Good thing that more and more site and apps are supporting dark modes as time passes. Many supports automatic switching based on OS/browser setting as well, what is great.
I dream with the day where this extension won't be needed anymore. Hopefully HN itself will support it someday.