One of the best dark mode extensions (along with Sauron, another great one). 5 stars. The following are my reasons:

1. Much snappier than all the other similarly principled extensions I've tried (including Dark Reader & Midnight Lizard, both of which are so... insufferably... slow...)
2. I have not encountered white blinding flashes (yet?) in-between opening new tabs & loading new pages. Dark Reader does this a lot & it is absolutely terrible. Midnight Lizard does this sometimes as well.
3. User friendly in terms of managing preferences.