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Is your question about what TLS the current versions of Firefox supports?
Firefox supports TLS 1.2 at minimum and TLS 1.3 at maximum as 1.4 is still in development. TLS 1.0 and TLS 1.1 have been deprecated since Firefox 78 Release and should not be used now days.
Is your question about what TLS the current versions of Firefox supports?
Firefox supports TLS 1.2 at minimum and TLS 1.3 at maximum as 1.4 is still in development. TLS 1.0 and TLS 1.1 have been deprecated [https://www.mozilla.org/firefox/78.0/releasenotes/ since Firefox 78 Release] and should not be used now days.
https://blog.mozilla.org/security/2018/10/15/removing-old-versions-of-tls/
https://hacks.mozilla.org/2020/02/its-the-boot-for-tls-1-0-and-tls-1-1/
