The issue is with IHub not Firefox. IHub thinks it needs to send you the Java page. So, have you tried completely logging out of IHub and back in? Also, try clearing the data cache. Go to Firefox Options|Privacy & Security. Scroll down until you find the "Manage Date" button. It will be on the right-ish. Clear any data for iHub. (you could just click "Clear data" but that would clear out everything from everybody.)
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