| network.dns.disableIPv6 | boolean | Firefox 68, Firefox ESR 68 | false
| If true, IPv6 DNS lokoups are disabled.
| network.IDN_show_punycode | boolean | Firefox 68, Firefox ESR 68 | false
| If true, display the punycode version of internationalized domain names.
| places.history.enabled | boolean | Firefox 68, Firefox ESR 68 | true
| If false, history is not enabled.
| network.dns.disableIPv6 | boolean | Firefox 68, Firefox ESR 68 | false
| If true, IPv6 DNS lokoups are disabled.
| network.IDN_show_punycode | boolean | Firefox 68, Firefox ESR 68 | false
| If true, display the punycode version of internationalized domain names.
| places.history.enabled | boolean | Firefox 68, Firefox ESR 68 | true
| If false, history is not enabled.