Thanks for the report! The dark theme is only a browser theme, it does not control dark/light mode. On Win10, you can configure it in Windows settings. Workaround on Linux: Open about:config, create a pref called `ui.systemUsesDarkTheme` set it to `1` and restart Firefox.
Bug 1671797 Comment 2 Edit History
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Thanks for the report! The dark theme is only a browser theme, it does not control dark/light mode. On Win10, you can configure it in Windows settings. Workaround on Linux: Open about:config, create a pref called `ui.systemUsesDarkTheme`, set it to `1` and restart Firefox.