Probably not right place to post, but certificate of
extended-validation.badssl.com is signed for Mozilla Foundation so it's part of Mozilla, and Most of it is about certificates, so...
It doesn't look like no actual person from Mozilla looking at it because person supposed to assigned to it now working at Dropbox, Mozilla poilcy test subdomain is terribly outdated like 'mozillla-modern' only supporting TLS 1.2 while actual recommendation is TLS 1.3 only, basic things like
revoked.badssl.com is now expired for two weeks.
I think someone from Mozilla need to look at it and do the cleanup.
it proably fall into crack because its source code is under chromium project but server is Mozilla's