diff -up nss/lib/ssl/sslsock.c.ssl2hello nss/lib/ssl/sslsock.c
--- nss/lib/ssl/sslsock.c.ssl2hello	2019-04-26 11:31:02.139693304 +0200
+++ nss/lib/ssl/sslsock.c	2019-04-26 11:31:36.842975724 +0200
@@ -86,7 +86,7 @@ static sslOptions ssl_defaults = {
     .enableTls13CompatMode = PR_FALSE,
     .enableDtlsShortHeader = PR_FALSE,
     .enableHelloDowngradeCheck = PR_FALSE,
-    .enableV2CompatibleHello = PR_FALSE,
+    .enableV2CompatibleHello = PR_TRUE,
     .enablePostHandshakeAuth = PR_FALSE
 };