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Re:How Firefox Got Fast Again by contravariant on Monday November 13, 2017 @11:16AM (#15687525)
I think light is the default for the release version, but devs seem to like dark UIs for some reason.
Re:How Firefox Got Fast Again by Sylos on Monday November 13, 2017 @03:34PM (#15689967)
There's a Light theme, a Normal theme and a Dark theme.

Dark is the default for the Developer Edition, which is what you're thinking of. But Normal is the default for Stable. Light is almost the same as Normal, but with a few more elements in white.

Re:How Firefox Got Fast Again by alex_duf on Monday November 13, 2017 @11:30AM (#15687647)
The reason is eye strain in poorly lit offices :)