Amazing! It offers a variety of dark themes, but even the default one "Dark mode #1 (simple dark)" is so good that I didn't really try the others. There is thought put to the color palette, it's not just pitch black but a lighter dark much more pleasing to the eye. Furthermore, the turn-off button is conveniently/easily accessible as there are some unavoidable cases when sites will be broken or incorrectly displayed.

However, I do have some concerns about privacy: why does it need permission to all our website data? Does it have display-customizations for certain sites so it needs to check at runtime which website is loaded?
If yes, ironically, the addons.mozilla.org is not affected by the dark mode :P

Works as it says in the description

this is definitely one of those add ons I've been looking for my whole life...I'm a biotechnologist and read a lot on web...keep up dating it make it unique....thank u Bernard...

It's really work!

It is not completely perfect on every website but still it does exactly what I need

Amazing! easy to use !!
and the color theme is so comfortable!!!

When refresh google search is white flash. Always. Mouse scroll on google search cause big drop fps and slowdown.

Some pages still display weirdly, but this is the most consistent dark mode extension I've found

Perfect