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Why did not Firefox warn me BEFORE the new verson 4 downloaded, that it would not operate on my MAC OS X.4???

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Without warning or option to cancel, Firefox 4 downloaded on my Mac OS X.4. Now Firefox will not open and I cannot use it. And no instructions given on how to remove and restore a Firefox that will run on Mac OS X.4.

Without warning or option to cancel, Firefox 4 downloaded on my Mac OS X.4. Now Firefox will not open and I cannot use it. And no instructions given on how to remove and restore a Firefox that will run on Mac OS X.4.

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I have the same exact problem only I don't have a Mac.