I have no idea how this is a recommended addon. When adding it to Firefox, a tab opens up with what appears to be a book they are selling, unrelated to this addon. I reported this, and I would advise you to steer clear.

Awesome.

It is really good, but can mess up some sites

Downloading this extension is the best thing I've ever done for my health and well-being!

Transforms web pages into eye-friendly dark themes, reducing strain during nighttime browsing. Customization options provide flexibility to suit personal preferences, this extension is a game-changer for a more comfortable and enjoyable online experience.

Created a great extension.

It works really well for most things, but if a website has a Disqus-style comment section it won't automatically turn it dark and I have to turn dark mode off and on for it to work. I have this problem on SBNation sites and on Angrymetalguy.com