Add a hook

[Th3Whit3Wolf]

It would be cool if I could give some terminal commands that can be ran as yin yang changes from dark to light.

I am using a light and dark mode userContent.css and userChrome.css for firefox and cronjob/systemd timers are the only other way to achieve switching them on schedule

[oskarsh]

I am planning a feature where the user can add custom scripts that are executed when the setting is enabled. It is not exactly a hook but should give the same functionality.

[amr3k]

@oskarsh Any update on this?