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Firefox does highlight registered domain "looking.tk" in white font and the rest of the URL is colored gray ("google.com.auth.something.else.realistic.looking.tk" and path).

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I've long been curious how exactly they determine the "registered domain", and your comment made me finally look for the answer. It looks like they use (and semi-manually maintain) a list of "effective TLDs": https://www.publicsuffix.org/

The maintenance process is described here: https://github.com/publicsuffix/list/wiki/Guidelines

For me it is black for the domain vs. dark grey for the rest (FF65). I actually never noticed this before, nice!

I think its dependent upon your theme. For example with a dark theme it is like so : https://i.imgur.com/bwsyhjN.png

Oh of course! Much more pronounced there.

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