diff -up firefox-68.2.0/security/manager/ssl/nsNSSComponent.cpp.old firefox-68.2.0/security/manager/ssl/nsNSSComponent.cpp
--- firefox-68.2.0/security/manager/ssl/nsNSSComponent.cpp.old 2019-10-24 14:20:21.227037984 +0200
+++ firefox-68.2.0/security/manager/ssl/nsNSSComponent.cpp 2019-10-24 14:45:52.769506967 +0200
@@ -996,6 +996,9 @@ void nsNSSComponent::FillTLSVersionRange
return;
}
+ // Enable TLS 1.3 as our NSS supports it.
+ supported.max = 0x304;
+
// Clip the defaults by what NSS actually supports to enable
// working with a system NSS with different ranges.
rangeOut.min = std::max(rangeOut.min, supported.min);