IPv6: should be enabled or disable?

[LinuxIsOne]

On Sun, Dec 11, 2011 at 7:18 PM, Harry Strongburg <harry.ubuntu at harry.lu>wrote:

> It used to be said that Firefox was faster if you disabled IPv6 in
> > about:config. Is this relevant?
>
> If (either your ISP or your networking setup) is giving you invalid
> routes for some reason, then yes, it would cause a slow load to a site
> that is IPv6 enabled. It shouldn't need to be changed unless you're the
> 1% that is using a broken network setup.
>

And the only possible ways to do this either of the following:-

1. From about:config options (within Firefox)
2. From Connections properties (ignore 'IPv6') (
http://postimage.org/image/aupupgorj/)

Any other method/thing also left in it?
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