ensure that CSS4 system colors are not a fingerprinting vector
From #33534 (closed): Firefox 76 added support for CSS4 system colors. It looks like these were not added to https://searchfox.org/mozilla-central/source/widget/nsXPLookAndFeel.cpp#534 (GetStandinForNativeColor()). We should test the behavior and consider updating the system colors to Windows 10 and MacOS 10.10.x.
https://bugzilla.mozilla.org/show_bug.cgi?id=1590894
"Need to support CSS4 system colors"
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