SERIOUS MEMORY LEAK. After a month of my laptop locking up and requiring a forced restart I narrowed it down to being Dark Reader with Sepia cranked up to the maximum setting. There's no doubt this is the most effective extension for forcing websites to "go dark". Unfortunately, it's unusable if it freezes your computer every few hours. UPDATE: tried it again a few months later and still the same problem.

DAMN GOOD!

has ads in the install and uninstall screens. bad

Works in many cases but fails to distinguish between domains and sub domains.

Midnight Lizard works more consistently

What's going on with this extension? Firefox reports that this is the culprit for the slowdowns and i check my task manager and it's using loads of RAM??

Best addon in history

works better than expected and replaced bad solutions I have used for years

After turning off dark mode on some web pages, you cannot turn on dark mode again. The button does not respond. Reinstalling an add-on does not help because some files remain after uninstalling it that saves its settings. There is no option to completely reset the add-on.