Good... almost. For instance, it doesn't work in this very page page at addons.mozilla.org

Ist eigentlich ganz gut für die wenigen Websites, die noch keinen Darkmode haben! Aber manchmal kommt es verständlicher Weise zu darstellungsproblemem 8 out of a 10!

Works really well for the most part, and on a lot of websites it completely looks like the site is using their own dark mode. However, it's not very good at detecting when sites have their own dark mode, so you have to manually disable it sometimes. Also, sometimes it doesn't properly invert some things and you'll have to change the filter mode or disable it for that site. But having dark mode for everything is worth the small bugs

4/5 cause you can't override what's protected by the browser

It takes time to apply the dark mode, but something is better than nothing

Unfortunately, it doesn't work on wikipedia-at least not for me.

Can you "darkify" some images? Sometimes all is dark and there are super light images it's horrible ☹️

Edit: they have the background of the old colors ☹️

Edit 2: some website divs with a the same background color as body but when dark reader is applied, their background color is different ☹️

Definitely helps me with this affliction to light brought on by migraines. Thank you 😊