Since full color management (bug 455077) has been landed in Firefox our screenshot code could produce incorrectly tagged images. Especially if the display isn't sRGB, which mostly happens under MacOS. For details see bug 1631089 comment 15.

I wonder if a wdspec test might be useful here, which has a pre-created reference image similarly to the Puppeteer unit test. That way we could check for equality even without having to deeply analyze the image like the tag, and colors of each pixel.

James, what do you think? I don't see problems for Chrome, but maybe we should talk with Brian in regards of Safari.

I think I might argue that WebDriver doesn't specifically require that you do anything in particular with colour management, so a test requiring specific behaviour seems dubious. But we could definitely have a Firefox-only test for this.

The severity field is not set for this bug.
:whimboo, could you have a look please?

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