So you’ve set up a tunnel with your favorite tunnelbroker (for example Tunnelbroker.net or SixXS) but Firefox still refuses to “see the light” and insists on an IPv4 web. You simply need to type about:config in the address bar and change network.dns.disableIPv6 to false.
Firefox and IPv6
Published
Managing organized complexity 
Funny you had to do that,
the default is set to false.
Not on Jolicloud.