how to disable TLS 1.0 and checking enabling SSl 3.0 in Firefox 27.0.1?

Question

How to disable TLS 1.0 and checking enabling SSL 3.0 in Firefox 27.0.1 (new Version) ?

I suppose I can find it at the Encryption tab.

I followed below path Tools -> Options -> Advanced

but there was not the tab anymore.

Answer 1

Almost anything can be configured in about:config. This also includes allowed TLS versions.

• security.tls.version.min specifies the minimum allowed protocol version
• security.tls.version.max specifies the maximum allowed protocol version

Acceptable values for these options:

• 0 – SSLv3
• 1 – TLS 1.0
• 2 – TLS 1.1
• 3 – TLS 1.2

Also, as noted in the linked article, the GUI options are gone since Firefox 23.