Citrix-XenApp Error (SSL-Server 61) with FF on OpenSuse 12.2

good day dear opensuse-fans,

I am trying to utilize Citrix XenApp to remotely access my work
userid and applications from home. I can login and see my virtual
desktop/applications, but when I try to run an application
I get SSL Error 61: you have chosen not to trust “Thawte Premium Server CA”
the issuer of the server’s security certificate.

How to get rid this error?
What can i do!?

How can i try to to update the certificate with FF