I am on Mac OS 10.6.7 and Java Plug-in 2 for NAPI will not work in FF4.0?

When trying to attend a webinar which uses the Java 2 NAPI plug-in I get an error message in FF 4.0 saying I need to install thiis plug-in, which is already installed. I have gone to the add-on manager and disabled this plug-in restarted and enabled it again, but it still will not work.
Any ideas?

I forgot one detail. This happened while I was having trouble seeing the mouse cursor (I use Apple's Magic Mouse). It had disappeared briefly. I had to drag the cursor out of the Firefox Window for it to reappear. I accidentally entered full screen view while the cursor was not visible.

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