[sfvisser]

Then you switch?

My entire OS, most apps and 90% of websites switch automatically with a single keyboard shortcut.

[Novosell]

90% of websites have built-in keyboard shortcuts for switching theme? We must visit different wevsites.

I use an extension for that.

[WD-42]

No, you change your OS preference and then most websites that are coded correctly will follow. I do it by sunrise and sunset but have a key binding to override it.