Automatic switch between dark/light mode for the Firefox New Tab backgrounds

[Propeller18]

I like the Kit wallpapers, but the dark/light version of the Wallpapers don't switch with my Computer's setting. I would like to have a little toggle (where it automatically uses the respective dark/light versions of the selected wallpaper) or two options: Use this for light mode, and that for dark mode. 

[Jon]

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