Hi GLB21, Firefox supports TLS 1.2 -- a connection protocol -- automatically without your having to make any changes.

Are you installing an additional program from you bank, such as "Rapport" from IBM or Trusteer?

If there is a page online with written instructions you are trying to follow, feel free to share a link to it if you have questions. Otherwise, it's a little difficult to understand the context.

And just to clarify, Mozilla is the maker of Firefox, a browser. Firefox has various security features to protect you while you are using Firefox, but it is not a security program that protects other programs on your system.

Firefox has supported TLS 1.2 by default since Firefox 27.0 Release (Feb 4, 2014) as per Bug#861266.

From Firefox 61 Release Notes:

On-by-default support for the latest draft of the TLS 1.3 specification

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

• security.tls.version.min = 1
• security.tls.version.max = 4

1 means TLS 1.0 2 means TLS 1.1 3 means TLS 1.2 (default as of 27.0 to 59.0 Releases) 4 means TLS 1.3 (default as of Fx 60.0 and later)

• http://kb.mozillazine.org/security.tls.version.*

James said

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

• security.tls.version.min = 1
• security.tls.version.max = 4

1 means TLS 1.0 2 means TLS 1.1 3 means TLS 1.2 (default as of 27.0 to 59.0 Releases) 4 means TLS 1.3 (default as of Fx 60.0 and later)

Are these 'Fallback' settings ok?:

Pj said

Are these 'Fallback' settings ok?:

When you say "ok" do you mean, are they safe, or do you mean, will they break sites? I think they're safe, and should be compatible with well-run sites.