--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -1529,17 +1529,17 @@ pref("network.IDN_show_punycode", false)
 // profile is used.
 // If "network.IDN.restriction_profile" is "moderate", the Moderately
 // Restrictive profile is used.
 // In all other cases, the ASCII-Only profile is used.
 // Note that these preferences are referred to ONLY when
 // "network.IDN_show_punycode" is false. In other words, all IDNs will be shown
 // in punycode if "network.IDN_show_punycode" is true.
 pref("network.IDN.restriction_profile", "moderate");
-pref("network.IDN.use_whitelist", true);
+pref("network.IDN.use_whitelist", false);
 
 // ccTLDs
 pref("network.IDN.whitelist.ac", true);
 pref("network.IDN.whitelist.ar", true);
 pref("network.IDN.whitelist.at", true);
 pref("network.IDN.whitelist.br", true);
 pref("network.IDN.whitelist.ca", true);
 pref("network.IDN.whitelist.ch", true);

--- a/netwerk/test/unit/test_idnservice.js
+++ b/netwerk/test/unit/test_idnservice.js
@@ -17,40 +17,9 @@ function run_test() {
      // - Converting UTF-8 to ACE and back gives us the expected answer
      // - Converting the ASCII string UTF-8 -> ACE leaves the string unchanged
      // - isACE returns true when we expect it to (third array elem true)
      do_check_eq(idnService.convertUTF8toACE(reference[i][0]), reference[i][1]);
      do_check_eq(idnService.convertUTF8toACE(reference[i][1]), reference[i][1]);
      do_check_eq(idnService.convertACEtoUTF8(reference[i][1]), reference[i][0]);
      do_check_eq(idnService.isACE(reference[i][1]), reference[i][2]);
   }
-
-  // add an IDN whitelist pref
-  var pbi = Components.classes["@mozilla.org/preferences-service;1"]
-                      .getService(Components.interfaces.nsIPrefBranch);
-  pbi.setBoolPref("network.IDN.whitelist.es", true);
-
-  // After bug 722299, set network.IDN.restriction_profile to "ASCII" in
-  // order not to change the behaviour of non-whitelisted TLDs
-  var oldProfile = pbi.getCharPref("network.IDN.restriction_profile", "moderate");
-  pbi.setCharPref("network.IDN.restriction_profile", "ASCII");
-
-  // check convertToDisplayIDN against the whitelist
-  var isASCII = {};
-  do_check_eq(idnService.convertToDisplayIDN("b\u00FCcher.es", isASCII), "b\u00FCcher.es");
-  do_check_eq(isASCII.value, false);
-  do_check_eq(idnService.convertToDisplayIDN("xn--bcher-kva.es", isASCII), "b\u00FCcher.es");
-  do_check_eq(isASCII.value, false);
-  do_check_eq(idnService.convertToDisplayIDN("b\u00FCcher.uk", isASCII), "xn--bcher-kva.uk");
-  do_check_eq(isASCII.value, true);
-  do_check_eq(idnService.convertToDisplayIDN("xn--bcher-kva.uk", isASCII), "xn--bcher-kva.uk");
-  do_check_eq(isASCII.value, true);
-
-  // check ACE TLD's are handled by the whitelist
-  pbi.setBoolPref("network.IDN.whitelist.xn--k-dha", true);
-  do_check_eq(idnService.convertToDisplayIDN("test.\u00FCk", isASCII), "test.\u00FCk");
-  do_check_eq(isASCII.value, false);
-  do_check_eq(idnService.convertToDisplayIDN("test.xn--k-dha", isASCII), "test.\u00FCk");
-  do_check_eq(isASCII.value, false);
-
-  // reset pref to default
-  pbi.setCharPref("network.IDN.restriction_profile", oldProfile);
 }