My java applet doesn't show up in Firefox

We have a new Mac running OSX 10.8.4 and installed with Firefox 21.0 and Java 7 update 25. The web applet/plugin doesn't show up in Firefox, if we go to java.com and do the tests it just comes back 'We are unable to verify if Java is currently installed and enabled in your browser'
The same test in Safari comes back fine and shows Java 7 Update 25 installed and working.
The plugin does not show at all in Firefox add-ons. Browser functionality is enabled in the main Java control panel.
We have completely removed and reinstalled both Firefox and Java.
Thanks

Hi iNerd
Thanks for the link but neither of the two options that are discussed are presented to the user. Instead the user just gets the message 'We are unable to verify if Java is currently installed and enabled in your browser'. I know it is installed and enabled for general browser use as it all works fine in Safari. We would obviously just use Safari except the key site the user needs to link to works better with Firefox.

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