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System theme: this option makes websites match your operating system theme.Firefox theme: this option makes websites match the Firefox theme you have installed, whether it's a third-party theme, alpenglow, colorways, etc.
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You can choose to have website appearance match your: Select the color scheme you want to use for the websites you visit.Scroll down to Language and Appearance.
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To access these settings, follow the steps below: You can configure this behavior and choose the color scheme you would like to use for those websites. If you set a light theme for Firefox in your browser's preferences and then set a dark theme from the colorways palette, colorways will override the light theme and websites appearance will adjust to match the new dark theme. When you visit a website in Firefox version 100 and above, its appearance changes to match your browser's theme.
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Please update your version of Firefox for the latest features and security updates.
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