Battle.net Certificate

I'm not sure if this would go here or on Technical Forums, so forgive my misplacement and move accordingly if needed. Normally whenever I browse around any Blizzard site, mostly battle.net, I have no issue.
But just a few minutes ago I attempted to go to browse to battle.net, and continued to log in.

When I click to go manage the account, Firefox stops me saying this:

Q u o t e:

This Connection is Untrusted



You have asked Firefox to connect
securely to battle.net, 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.

Under technical details:

Q u o t e:

battle.net uses an invalid security certificate.

The certificate is only valid for *.battle.net

(Error code: ssl_error_bad_cert_domain)

Did something happen and now it is not safe?



EDIT:
The page that gives me this error is: https://battle.net/account/index.xml
I am directed to there when I click the "Create or Manage a Battle.net Account"