I use Chatzilla to chat on IRC. When I connect to an SSL port, I'll often get the message that I need to add an exception because the security certificate is invalid. In fact, this is the rule rather than the exception.
Servers like geekshed, rizon, etc... servers everyone uses. I feel they are perfectly safe, and I'd very much like to set things up so I don't have to accept a certificate each time I connect or my connection drops for a few seconds and a reconnect happens.
Often, I'll have to request a certificate multiple times before the connection finally continues. If this was just accepted automatically it would save a lot of time.