--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -1989,17 +1989,17 @@ pref("network.dns.offline-localhost", tr
 pref("network.standard-url.max-length", 1048576);
 
 // The preference controls if the rust URL parser is run in parallel with the
 // C++ implementation. Requires restart for changes to take effect.
 pref("network.standard-url.enable-rust", false);
 
 // Whether nsIURI.host/.hostname/.spec should return a punycode string
 // If set to false we will revert to previous behaviour and return a unicode string.
-pref("network.standard-url.punycode-host", true);
+pref("network.standard-url.punycode-host", false);
 
 // Idle timeout for ftp control connections - 5 minute default
 pref("network.ftp.idleConnectionTimeout", 300);
 
 // directory listing format
 // 2: HTML
 // 3: XUL directory viewer
 // all other values are treated like 2