Adjust dark/light mode independent of browser style

[anyone00]

Is your feature request related to a problem? Please describe.
It is not related to any problem, I've set my OS theme to light mode and firefox uses that. but I want my webpages to be dark, so I use dark reader extension but that does not affect other extensions.

Describe the solution you'd like
It would be nice to have a switch in the settings to choose between dark/light/auto.

Describe alternatives you've considered
I can use dark mode in my OS settings & firefox but that's not my preference.

Additional context
It already has dark mode support so I suppose it would not be hard to add the feature.