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The latest update 5.0.3 seems to have solved the problem.
FWIW, I have encountered some other errors in the Maxmind data base which I use to block connections to some "bad" places using a program called LittleSnitch on my Mac.
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China flag on Gmail [RESOLVED]
China flag on Gmail [RESOLVED]
FF 3.6 - Mac OS10.5.8
Computers I've used: IBM 7094/UNIVAC 1108/IBM 360/DEC PDP11/DEC VAX-11 780/DEC VAXstation 8000/Sun SPARCstation 2/Mac from 1984 to 2010
Computers I've used: IBM 7094/UNIVAC 1108/IBM 360/DEC PDP11/DEC VAX-11 780/DEC VAXstation 8000/Sun SPARCstation 2/Mac from 1984 to 2010