Firefox looks like Windows firefox in (system-wide) light mode, but follows gtk3 theme in dark mode

I think you’re mistaken. “System theme – auto” always uses GTK colors, in both light and dark mode. The “Light” theme is different, even if the difference is more subtle than with “Dark”. “System theme” (light mode) is a distinctly warmer shade of gray than “Light” (which is the only variation you didn’t screenshot).

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