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The heuristic I cribbed from the web doesn't work.  In particular, it says that google.coop.evil.com is owned by google.  Oops.

I can't accept any false positives for the phishing warning.  I tried other heuristics, but they fail except for trusted top and second level domains, e.g., ca.gov.  Since those cases won't affect the most common source of false phishing warnings, I'm not going to even try.

alanhkarp/SitePassword,alanhkarp/SitePassword