I got to your last post just a few seconds too late. I had already tried clearing the FF cache and history, and now it works fine.
I had already looked at the page source, comparing the working IE version with the non-working FF version, and FF really didn't have the content. It had the code for the upper navigation bar followed immediately by the code for the lower bar, so it really was displaying what it received.
No idea how that happened.
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