Enable TLS 1.1 and 1.2 in Mozilla Firefox 24.0

For you Firefox users out there here’s the way to enable TLS 1.1 and 1.2.

Mozilla Firefox 24.0 defaults to SSL 3.0 for the lowest type of encryption and TLS 1.0 as the highest type of encryption.

Type in


in the address bar and move past the warning.
Type in


and replace the ‘1’ with ‘3’ to enable TLS 1.2.

You may also set the lowest allowed encryption menthod by doing as follows.



and replace the ‘0’ with ‘1’ to switch from SSL 3.0 to TLS 1.0.

You may also look up the reference over at Mozilla by yourself here

// CrashMAG

7 thoughts on “Enable TLS 1.1 and 1.2 in Mozilla Firefox 24.0”

  1. Thank you. Why don’t Mozilla provide a user setting for this? It’s irresponsible for browser vendors to be promoting insecure protocols like this. Even Microsoft have seen the light and enabled TLS 1.1 and 1.2 in IE11.

    1. I totally agree that this should be made accessible on the Preferences menu. Further, it would be a great public service – in keeping with a non-profit mentality – to promote that customers upgrade to the higher encryption rate. Just my two cents worth…rounded up to a nickel.

  2. sorry, I am in Firefox 47.0
    and I can see the security.tls.version.max and .min,
    but I cannot replace the ‘1’ with ‘3’ nor the ‘0’ with ‘1’

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