I am so happy to have a universal "dark mode" for browsing that is customizable like this! I have tried dozens of dark mode Firefox extensions, and none of them give the granular control and theme customization that Midnight Lizard does.
The only reasons I didn't give 5 stars are:
1) Saving changes to an existing theme is a bit cumbersome. Any change made sets the theme to "custom" instead of the theme I was currently using. Then I have to click Color Schemes, then choose the one you are editing from the dropdown, then enter the name again in the box before clicking "save". I'd like to be able to update the current theme by clicking "Apply" on the main screen.
2) The toolbar icon for this extension is very brightly colored, and rather too small to see the detail in certain browser themes. It would be nice to have a monochrome, simple geometric icon that blends with the rest of the native themes, or the ability for the user to customize the icon.

Other than that, great work, and thank you very much for helping me use my browser without burning out my retinas (the web is normally way too bright).
Also, thanks for the Solarized-like scheme on the forums. Please make it a built in theme, since I know I'm not the only person wanting it.

Cooool!
!!

This app is insanely useful, and works on every website i've tested. My only complaint is that it's a hard to use at first, and when changing values, it'll take a few seconds after pressing apply for your results to show up which is annoying when you want to fine tune a page to your liking.

Thank you
it is One of the best dark mode add-on.
Please add right click context menu command to enable/disable it.

After installing this I get the "This extension (Midnight Lizard) is slowing down the tab, would you like to stop it" popups at ALL sites I visit. Browser was lagging like crazy. NOT RECOMMENDED.

EDIT: Thanks, I followed the advice from the developer and things are a lot lighter overall now, although sites where a different theme is active still feel quite heavy on the browser though, but it's not a universal problem now.

I like the app, but when you move the icon to the "Other tools" list, the scale of the settings window changes to a very small one.

Very easy to use, hope to support Traditional Chinese interface!

Ayuda en un % a descanzar la vista, siempre que mantenga una tonalidad gris, pero es agradable.