diff -up nss/lib/ssl/sslsock.c.tls13-default nss/lib/ssl/sslsock.c
--- nss/lib/ssl/sslsock.c.tls13-default	2020-01-27 10:21:44.930830558 +0100
+++ nss/lib/ssl/sslsock.c	2020-01-27 10:21:47.419852229 +0100
@@ -97,7 +97,7 @@ static sslOptions ssl_defaults = {
  */
 static SSLVersionRange versions_defaults_stream = {
     SSL_LIBRARY_VERSION_TLS_1_0,
-    SSL_LIBRARY_VERSION_TLS_1_3
+    SSL_LIBRARY_VERSION_TLS_1_2
 };
 
 static SSLVersionRange versions_defaults_datagram = {