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

 };