Night Eye is a browser extension that enables dark mode on almost all websites, including Facebook, Google, Quora, Github, Stackoverflow, and Wikipedia, among others. It is available for Google Chrome, Mozilla Firefox, Opera, Vivaldi, Yandex, and Microsoft Edge . The extension offers three different modes: Dark, Filtered, and Dynamic .
According to user reviews, Night Eye is an excellent dark mode extension that is highly customizable and has bonus features that help make some websites more compatible with dark mode 1. However, one of the downsides is that it requires a paid subscription or a initial payment to purchase a lifetime license for multiple browsers. 
Night Eye is also known for reducing eye strain and promoting overall eye health by minimizing blue light exposure and in my opinion is doing the best job in this field.

Very useful , and easy to use

excellent QoL, very easy to enable/disable

My eyes are sensitive to bright images so this extension has been very helpful in making websites in general easier to view.
I appreciate having an all in one solution that applies a dark theme to sites across the board rather than having to individually setting a dark theme at each location (and some don't even offer that).
Definitely recommended.

Night eye really helps me browsing the internet, I have sensitive eyes so this extension is really helpful.

I *hate* working in anything other than Dark Mode... Every app, every screen. I've used a lot of "dark mode" extensions for browsers (some honestly with more customization options, but at the cost of manual scripting), and by far the best out-of-the-box, cross-platform experience has been Night Eye!

"Night Eye - Dark mode
by Night Eye" is absolutely the best dark mode ever. Try it and you'll keep it forever!

totally does what is expected, a beautiful dark mode for every page, everything synced without errors

great mode. love it

I like dark mode websites

using google sites that don't offer dark theme is awful, but night eye fixes that. it's easy to turn on or off, in the case of it making a website worse, it woks very well for nearly every site that doesn't offer a dark theme.

very helpfuly

Normal modda kullanıp sadece istediğin sayfayı koyu moda alabiliyorsun. Otomatik zamanlayıcısıda var gündüzleri kapatıyor. Oh daha ne olsun. Emeği geçenlere teşekkürü bir borç bilirim.

Shopping on Amazon has never been better with dark mode on

I love this extension. It's saving my eyes

Soy estudiante y suelo trabajar muy tarde, es por ello que uso Nigth Eye - Dark Mode para proteger mi vista de la luz blanca predominante en la web.

I'm student and I work to late so I use Night Eye -Dark Mode because it protects my eyes from white light on web pages

Amazing and well done