Firefox can't open the application "because it is not supported on this architecture

"You cannot open the application "Firefox" because it is not supported on this architecture."

Thanks for the link to the system requirements, edmeister. However, my system appears to fit every requirements listed, but still gives the same error message.
Here is what my system profiler tells me about my Imac:
Mac OS X v. 10.5.8
Processor: 2 GHz Intel Core 2 Duo, which Wikipedia tells me is "x86" processor
3 GB 667 MHz DDR2 SDRAM
My Activity Monitor says:
1.87 GB of my system memory free
303 GB of hard disk space free
Is there some explanation why I am being told Firefox 4 is not being supported on this architecture?

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