Great features and really saves my eye strain. Unfortunately it makes your browser extremely slow. Some sites take over 30 seconds to load with this add-on enabled. When you disable the add-on the sites load fine.

This add-on attempts and almost always achieves an incredibly difficult thing. Websites are incredibly varied in the way they implement CSS so adjusting it on the fly is a monumental task. This does so in a very intelligent way and mostly works well. There are situations where you have to tweak the settings a bit but I don't see that as a negative. The fact that there are so many ways to configure things is a huge plus. A big thanks to the developers and contributors to this project. You're doing an amazing job!

Used to really enjoy this addon, but has been very slow and several sites have stopped loading sections properly since latest update

UPDATE: 24-nov 2020: now even salesforce is get properly dark 🌘💪😀
Thanks, still the best "darkning" tool 🤟👍
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UPDATE on my review 11-may 2020:
Since last update of the Add-On, all works well again 👍😃
Thank You!!
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Since last update of 24-apr 2020, the add-no no longer works properly on FaceBook. FB default images ( e.g. Like or Shortcuts to Messenger ) don't show up any-more???
24-apr 2020 - 15:12
Also other sites have similar problems, looks like "radio-buttons" don't work any-more. The radio-button options are not showing???

One of the best and most useful extension ever.

The Best.