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Maybe the extension could check the info on the SSL certificates (if available) if the domain is registered through a proxy?

This is almost necessary for the extension to be useful. A good number of domains I checked are all "run" by WHOISGUARD, INC.

Hm, do SSL certificates have information about the owner?

I think only Extended Validation (EV) certificates have this info by default :(

Some do, some do not.