I have the same issue. I was just browsing a few moments ago finalizing my list and I got this:
"You have asked Firefox to connect securely to
www.firstchoicebyandymark.com, 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."