Mozilla Firefox warns websites to enable TLS 1.2 (How to disable old TLS versions)

Mozilla forces websites to enable at least TLS version 1.2 in the near future. Websites that still use TLS 1.0 and TLS 1.1 will be warned by Firefox. If websites do not use Transport Layer Security 1.2 or even better TLS 1.3, Mozilla Firefox will display a warning message.

TLS 1.0 and TLS 1.1 are no longer supported in the test version of Firefox from October. It is expected that in 2020 the support for the older TLS version will no longer be supported in Firefox, just as the Google Chrome, Safari, and Edge web browsers.

Disable TLS 1.0 and TLS 1.1 support in Firefox

It is possible to disable TLS 1.0 and TLS 1.1 support in the current version of Firefox.

To disable the older version of TLS in Firefox, open the about:config page in the navigation bar.
Accept the warning “I accept the risk” and search for: security.tls.version.

Double-click on security.tls.version.min and change 1 to 3. This will change the TLS settings for Firefox.

change tls security firefox

You now force Firefox to accept at least TLS version 1.2 when visiting websites.

For more information about TLS and your web browser, you can view your current Firefox TLS setting on

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