investigate whether the -moz-windows-accent-color-in-titlebar media query adds a fingerprinting vector
As of Firefox 56, support was added for a -moz-windows-accent-color-in-titlebar media query. We should determine whether this adds a fingerprinting vector and what to do about it if it does. See: https://bugzilla.mozilla.org/show_bug.cgi?id=1379938