Peer’s Certificate has been revoked
The error SEC_ERROR_REVOKED_CERTIFICATE means that the website's SSL/TLS certificate has been revoked by the certificate authority (CA). This prevents secure connections because the certificate is no longer trusted.
Todas as respostas (3)
That's not a Firefox issue but whatever that site issue with the CA to fix.
Firefox might be the last browser that does a real-time check of whether a site's SSL certificate is still valid. Most other browsers rely on a list that is updated from time to time.
To cross-check whether the certificate was really revoked, you can use this test page: https://www.ssllabs.com/ssltest/analyze.html?d=students.cuchd.in (Spoiler alert: Firefox is correct)
It seems weird that there is a Try Again button, but no "Advanced" button allowing you to make an exception. I think you need to use another browser for this site for a while until the site installs an updated certificate from GoDaddy (or a different vendor if it is fed up with this common GoDaddy issue).