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Disable ipv6 and force ipv4 for all DNS lookups.

    Bit more context is needed.

      Firefox allows disabling ipv6 (in about:config, search for network.dns.disableIPv6).

      For why that should be done, refer to this link:
      https://github.com/arkenfox/user.js/blob/2787da7f90b31b19d3549b61a77210b79bd1166b/user.js#L284

      I am copying it below:

      • IPv6 can be abused, especially with MAC addresses, and can leak with VPNs: assuming your ISP and/or router and/or website is IPv6 capable. Most sites will fall back to IPv4
      • [STATS] Firefox telemetry (July 2021) shows 10% of all connections are IPv6
      • [NOTE] This is an application level fallback. Disabling IPv6 is best done at an OS/network level, and/or configured properly in VPN setups. If you are not masking your IP, then this won't make much difference. If you are masking your IP, then it can only help.

        If internet is ipv6 ready, two DNS lookups are made for every request -- ipv4 and ipv6. Orion should block ipv6 requests.

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