https://www.mozilla.org/en-US/firefox/74.0/releasenotes/

Changed
(…)
We have disabled TLS 1.0 and TLS 1.1 to improve your website connections. Sites that don't support TLS version 1.2 will now show an error page.

We reverted the change for an undetermined amount of time to better enable access to critical government sites sharing COVID19 information.