I've sent a patch to wine-patches that works for me. Would you care to try it?
Mozilla is almost certainly wrong, though: the maximum size for the TZ environment variable is 15 chars (16 with the NULL): http://msdn.microsoft.com/library/en-us/vclib/html/_crt__tzset.asp
The corresponding names in _tzname are probably only 3 chars in length, so 4 bytes long including the NULL terminator.
Mozilla is probably scribbling over memory in this case, with who knows what consequences.
--Juan
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