Reply to a comment from mariakatosvich

Current Firefox no longer have a user interface setting to disable TLS or SSL3, but you can make the change on the about:config page. Future Firefox versions will support higher TLS versions (1.1 and 1.2) and both SSL3 and TLS 1.0 are enabled by default.
You can set the security.tls.version.min and security.tls.version.max prefs to 0 to disable TLS (0 means SSL3)

Thanks

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