Using Firefox 2.0 with IPv6 on MacOS X

By default, Firefox disables IPv6 support on MacOS X but not on other platforms. To enable IPv6 on Firefox, do:

1. "about:config" in the url box.
   
2. filter "ipv6",
   
3. select "network.dns.disableIPv6"
   
4. and set the value to "false".
   

For more information, see mozilla knowledge base.