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for websites I can't recommend the browser add on stylus enough.

Slack not having a dark mode is also a thing I don't understand.

I feel like this is worth mentioning.

If I go looking for an extension called "Stylish", will I find the original? Is it trustworthy?

AFAIK, you should use Stylus (opensource clone) instead of Stylish (history-stealing original), like mentioned in GP.

Oh. The names are close so I accidentally conflated the two. Thanks!

There is a dark mode setting on the Android app. I'm looking at it right now.

Otherwise, you can customize the color profile to your liking.