diff --git a/modules/libpref/src/init/all.js b/modules/libpref/src/init/all.js
index 79bf5e757d1..857b94ac6a6 100644
--- a/modules/libpref/src/init/all.js
+++ b/modules/libpref/src/init/all.js
@@ -626,6 +626,7 @@ pref("network.IDN.whitelist.tw", true);
 pref("network.IDN.whitelist.vn", true);
 
 // non-ccTLDs
+pref("network.IDN.whitelist.biz", true);
 pref("network.IDN.whitelist.cat", true);
 pref("network.IDN.whitelist.info", true);
 pref("network.IDN.whitelist.museum", true);