Can't override GitHub theming

[wasker]

I run Windows in dark mode (widgets look better and less distracting), but prefer content to be light, because I can't read white-on-black for long periods of time. Firefox applies dark mode to content in this case, and I hope Midnight-Lizard to override that.

On GitHub, when I signed out:

1. Firefox applies dark mode, I can't change it on GitHub itself (signed out).
2. I enable Midnight-Lizard with enhanced contrast theme.
3. GH looks dark anyway.