Firefox Information

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Firefox maintains an internal whitelist of TLDs whose registries have anti-spoofing policies. IDN URLs whose TLDs are not on the whitelist display as Punycode (A-labels) in the UI.

The 11 example.test TLDs are whitelisted in Firefox 3, and so no further configuration is required for that browser. For Firefox 2, the easiest way to whitelist the TLDs is as follows:

  • Make very sure Firefox is not running
  • Find your profile folder
  • Open the file prefs.js in a plain text editor (not Word or Wordpad)
  • Paste the following at the bottom of the file
  • Close the file
  • Restart Firefox 
user_pref("network.IDN.whitelist.xn--0zwm56d", true);
user_pref("network.IDN.whitelist.xn--11b5bs3a9aj6g", true);
user_pref("network.IDN.whitelist.xn--80akhbyknj4f", true);
user_pref("network.IDN.whitelist.xn--9t4b11yi5a", true);
user_pref("network.IDN.whitelist.xn--deba0ad", true);
user_pref("network.IDN.whitelist.xn--g6w251d", true);
user_pref("network.IDN.whitelist.xn--hgbk6aj7f53bba", true);
user_pref("network.IDN.whitelist.xn--hlcj6aya9esc7a", true);
user_pref("network.IDN.whitelist.xn--jxalpdlp", true);
user_pref("network.IDN.whitelist.xn--kgbechtv", true);
user_pref("network.IDN.whitelist.xn--zckzah", true);

Note that damaging prefs.js can be Bad News. Be careful out there.

Firefox 2 has some remaining bugs regarding the display of IDN names, which means that the A-label may be displayed in some parts of the UI even when the TLD is whitelisted. However, this problem is only cosmetic - access to the sites should be unaffected.

Retrieved from "http://idn.icann.org/Firefox_Information"
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