There should be no problems running it with FF, it's working quite well on my system with FF1.5.0.7 - which version of Zimbra have you got installed? Have you got any extensions installed in FF that may be causing this? Try disabling any extions (if you have any installed) one by one and see if any of the are causing the problem.
I forgot the obvious have you cleared the cache and restarted FF and which o/s is this on?
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Regards
Bill
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