Firefox Portable & Java Plugin

Dear all,

I've being trying to run Firefox Portable (versions ESR 45.7 and regular 45) with jPortable (versions 8 update 91 and 121) with no success.

I'm capable of seeing the plugin available in the browser but when I try to run an applet (such as in https://www.java.com/en/download/installed.jsp) it just stays blank after I click on "Verify java version".

Some time later a message appears saying that it wasn't able to detect the installed version.

Any idea what is happening?

Kind regards,