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There are TLS settings prefs on the about:config page that specify the minimum and maximum TLS version.

security.tls.version.max = 3 (TLS 1.2) security.tls.version.min = 1 (TLS 1.0) 1 means TLS 1.0; 2 means TLS 1.1; 3 means TLS 1.2; 4 means TLS 1.3; http://kb.mozillazine.org/security.tls.version.*