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Adjust new tab appearance according to system dark/light theme?

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Niklas
Niklas
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I am using a wallpaper on the New Tabs page.

It's nice. But I would like to do one additional thing with them: Adjust the selected wallpaper based on the dark or light mode on the operating system, for example by toning the brightness down a bit when using dark mode, or choosing a different image/color altogether.

I don't think this is possible using the settings alone, but maybe using useChrome.css? However, I cannot figure out how exactly to do that.

I am using a [[Customize items on your Firefox New Tab page|wallpaper on the New Tabs]] page. It's nice. But I would like to do one additional thing with them: Adjust the selected wallpaper based on the dark or light mode on the operating system, for example by toning the brightness down a bit when using dark mode, or choosing a different image/color altogether. I don't think this is possible using the settings alone, but maybe using useChrome.css? However, I cannot figure out how exactly to do that.

Modified by Niklas

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