D/L'd FF v4.0(b1) today. Installed twice but FF will no longer start-up

I'm using Mac OSX 10.4.11. I excitedly downloaded Firefox v4.0 (b1) and moved the new files to Applications folder (twice). Now FF won't start-up. I don't even get a spinning ball! Suggestions?
== This happened ==
Every time Firefox opened
== Replaced previous version of FF with newest version ==
== User Agent ==
Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10_4_11; en) AppleWebKit/533.16 (KHTML, like Gecko) Version/4.1 Safari/533.16

Can you try starting Firefox in [[Safe Mode]] to see if it starts up? If it does, close out the Safe mode Firefox and start it up normally.

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