SDB:Disable IPv6 for Firefox

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If you don't need IPv6 support turned on, here is how to disable it in Mozilla Firefox.

Before you start

  • If your next question is:"What is IPv6?" then you don't need it.
  • If the browser is used in commercial environment, then you have to ask your company's network administrator.


  • Type about:config in the address bar, and hit the Return or Enter key.

Firefox IPv6 about config.jpg

  • Type ipv6 in the filter field.
  • Highlight network.dns.disableIPv6 by right-clicking it, and change the value from false to true using Toggle.

Firefox IPv6 filter toggle.jpg

  • This will disable asking DNS for IPv6 addresses and will speed up website access if your network is not configured properly for IPv6.