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How can I use the "prefers-color-scheme: dark" CSS media query on FF Developers Edition, Ubuntu 18.04?

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I'm trying to test latest CSS properties that I think FF 67 supports. Specifically:

prefers-color-scheme: dark

Is this something I can set in FF? Or is this an OS level integration?

Thanks.

I'm trying to test latest CSS properties that I think FF 67 supports. Specifically: prefers-color-scheme: dark Is this something I can set in FF? Or is this an OS level integration? Thanks.

Edeziri site na jhchnc

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(removed comment, figured out how to edit post)

Edeziri site na jhchnc

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It's OS based and probably you can't set the dark mode in Ubuntu. It works in Win10 and perhaps in Mac.

But according to bug 1529323, devs are considering setting 'prefers-color-scheme: dark' when the dark theme is chosen in Firefox.