So, turns out my previous comment, which I have now deleted, was due to a false positive while troubleshooting Firefox to find what caused an ungodly high memory usage (>95% of RAM eaten). There are still some problems with Dark Reader, it won't remember the settings for some websites or won't turn itself on or off on some pages for some unknown reasons, but, overall, it does it's job in a good way.

Excellente extension !

굿~!!

Great add-on, very useful for using my computer at night. The only thing is that I can't seem to turn it off? I can adjust the settings and switch between Dark/Light modes, but when I try to use the "Off" button or the keyboard shortcut nothing happens. Several times, when I've been using my computer in the day and didn't want an extremely dark or desaturated screen on webpages, I've just uninstalled the extension and reinstalled it later. This is obviously very annoying, though.

EN:
The best extension of its kind. Everything stated is there. Safe, open source and mozzila tested, updated regularly.

RU:
Лучшее расширение в своем роде. Всё заявленое есть. Безопасно, открыт исходный код и проверен mozzila, регулярно обновляется.

I've been using it for only a few days, and I'm amazed with how good it is. Sometimes the result looks even better than the own website's dark mode theme. There are also a few cases where the result isn't great of course, but it's fine...

My only complaint is that this extension breaks QR Codes in some websites, due to the black background touching the qr code's border squares. Nothing that can be done I think... I just use the shortcut to disable the extension, read the qrcode then enable it again.

Sexcellent. does exactly what I wanted it to do, and even better than I wanted it to do it!

A great extension for the eye