Not by default, but you can try to enter ''about:config'' in the address bar and set ''security.tls.version.min'' to '''1'''.

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. Firefox may support these protocols (when you absolutely need it) via security.tls.version.enable-deprecated = true in about:config . This should only be enabled temporarily to access your one application. 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/