Andy K wrote:

June 30, 2018 is the deadline for disabling SSL/early TLS and
implementing a more secure encryption protocol – TLS 1.1 or higher
(TLS v1.2 is strongly encouraged) in order to meet the PCI Data
Security Standard (PCI DSS) for safeguarding payment data.

For Firefox and Seamonkey

In about:config, set security.tls.version.min to 2 to prevent
protocols lower than TLS 1.1 from being used.

Reference: http://kb.mozillazine.org/Security.tls.version.*


You can also do this through the user interface:
Edit | Preferences | Privacy & Security | SSL/TLS
Uncheck the box for TLS 1.0.

The two functions are equivalent; your way doesn't prevent the user from enabling TLS 1.0 later.

--
War doesn't determine who's right, just who's left.
--
Paul B. Gallagher

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