GTalk Chat is disabled under Firefox3

Since I upgraded from firefox 2 to firefox 3 (sometime ago) I had to deal with the certificate stuff which is some security at the cost of some unfriendly pain… Anyway security rarely comes without pain: having to remember crazy passwords, having to bear this f*ing virus scanner at work…

So well I encountered this on GTalk from https GMail interface:

Chat is disabled.
Your internet connection is experiencing problems or your network administrator has blocked Gmail chat. Learn more

There is absolutely no internet connection problem (it works with Internet Explorer), and it seems as if not everybody encounter this issue.

I have been fetching the web for a solution without success, so here is mine:

You should add https://chatenabled.mail.google.com/ to your certificates as it will be unknown:

(Code d’erreur : sec_error_untrusted_issuer)

You can log back to GMail and you should see GTalk.