Just dowloaded firefox4 on m macbookpro(10.4.11). i keep getting a message that it's incompatible with this version of my Mac. what's wrong?

I've been happily using firefox on my macbookpro and I downloaded firefox4 but when I try to start it up, i get a message saying that I cannot use the application Firefox with this version of Mac OS X. Can I get the old firefox back? Did I screw something up? Help.

Firefox 4 requires at least OS X 10.5
You can get the latest version of Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html

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