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

YESSSS!! I've been many days thinking about how could I manage to achieve something like this, setting my two custom themes instead of using the default dynamic theme which I don't really like, and finally found it! Thanks a lot Simon for your idea and your time invested on this!!

btw, the themes I use and I totally love are:
Day: "Google Chrome Light" https://addons.mozilla.org/es/firefox/addon/google-chrome-light/
Night: "Google Chrome Dark" https://addons.mozilla.org/es/firefox/addon/google-chrome-dark/

Both made by the same user, StyleFox

是否可以加一个根据系统自动主题的选项？不喜欢用火狐的默认主题，因为标题栏是黑色的，非常感谢。

Best plugin to meet my need