Unfortunately you are correct, Firefox is the only browser that doesn't support it, but support might be added in the future bugzilla.mozilla.org/show_bug.cgi?....
Also, From what I can tell, Firefox can automatically change the color of the scrollbar based on the background you set, so, as long as you test your dark mode on Firefox before publishing your site, you should be good.
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Unfortunately this is currently not supported in firefox
Unfortunately you are correct, Firefox is the only browser that doesn't support it, but support might be added in the future bugzilla.mozilla.org/show_bug.cgi?....
caniuse.com/?search=color-scheme
Also, From what I can tell, Firefox can automatically change the color of the scrollbar based on the background you set, so, as long as you test your dark mode on Firefox before publishing your site, you should be good.