The options always reset when i restart firefox.

Simple UI, works like a charm

Working well. Wish it could change my themes every (n)hours. I have a collection of themes, you know.

Just what I wanted. Thank you!
It changes the Firefox theme when my system theme changes.
This along with Dark Reader makes life easy.

I use the "Change themes based on the system theme" and it works so perfectly. Thank you Simon!

So perfect. This is exactly what I need.

This is one of the best addons for Firefox.

Maybe a Release for Thunderbird 78?

Works well. Thank you for this extension. Cheers!

Thanks!
Utiling together "automaticDark - Time-Based Theme Changer by simonkhzhang" + "Darkify by Gabriel" = and I am completly satisfied with this)

Simple, lightweight and it works, just what you need for something like this.

Working as intended, big big thanks Simonkhzhang

Totally awesome this addon! Match perfectly with Win 10 1909 light/dark mode