The following error shows up with our web app on Firefox when applet is
accessed with Java 7 update 45 installed. It does not happen on IE.

Appears to fail the same way with 7u51 also.

The specific version of Firefox used is being clarified.

"Security Warning - The certificate is not valid and cannot be used to verify
the identity of this website."

It shows a warning about missing Permissions attribute. However, we did
include this attribute in our signed Jar (signing certificate purchased from
Thawte). Our applet is deployed using <object> tag in html.