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It's interesting it thinks i'm on FF 4. I guess FF has updated faster than a snow melting in Florida and it cannot keep up. But FF4, come one!
Did I tell you about the time I inadvertently locked out an early-adopter of MSIE 10? Yup: code said MSIE [1-4] without trailing \. or \b. If they're using ::yawn:: UA detection rather than feature detection, they could easily have something that says "Firefox " left over from, uh, 2011 or whenever FF5 was released.
:: shuffling papers ::
Oh, ###. I meant that as a joke, but quick detour to FF Updates List reveals that my own computer went to FF5 in mid-August 2011, followed by FF6 scarcely a week later.