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