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I was starting the desktop by dropping the icon onto the FF icon from the desktop. When I started FF and pasted the url (http://localhost:7633/zimbra/mail#1) from IE everything loaded ok.
With Firefox sometimes you'll have to clear the cache ("Clear Private Data") and restart Firefox. And in some occasions you may even need to repeat this several times. I found this after installing 0.53 myself, but eventually it worked. Thanks!