[Mozilla Enterprise] Firefox and Java

[MELTZER, MARC S. (ITID) (FBI)]

We have a web application that calls a Java applet that seems to be very particular under which conditions it runs.

When we use Firefox ESR 38.x and Java 7, everything runs fine.
Firefox ESR 38.x and Java 8, everything runs fine.
Firefox ESR 52.x and Java 7, everything runs fine.

So far, you'll see if we mix old and new versions, things run smoothly.

When we run Firefox ESR 52.x and Java 8, however, the Java applet cannot be called.

Does anyone have any ideas why this might be?  The configurations of the different versions are the same in each case, so I don't think it's a settings issue.  Is there perhaps some protocol or some other setting that has been deprecated in either product that somehow is preventing the applet from running?  Any ideas how to troubleshoot?

Thanks,
Marc