When I tried to create a new account at www.scala-lang.org I got:
This Connection is Untrusted You have asked Firefox to connect securely to www.scala-lang.org, but we can't confirm that your connection is secure. Normally, when you try to connect securely, sites will present trusted identification to prove that you are going to the right place. However, this site's identity can't be verified. What Should I Do? If you usually connect to this site without problems, this error could mean that someone is trying to impersonate the site, and you shouldn't continue.
www.scala-lang.org uses an invalid security certificate.
The certificate is not trusted because no issuer chain was provided.