Why can't I update to Firefox 4 even though I'm running Mac OS 10.5.8?

The site lists on its system requirements that I have either Mac OS 10.5.x or 10.6.x. I have 10.5.8 but the site says my operating system isn't compatible with Firefox 4. Am I overlooking something obvious here? Any suggestions would be appreciated! Thanks!

Firefox 4+ versions aren't compatible with Power PC Mac's.
For older Macs that aren't supported in Firefox 4+ versions, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 . 
http://www.floodgap.com/software/tenfourfox/
http://tenfourfox.blogspot.com/

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Why can't I update to Firefox 4 even though I'm running Mac OS 10.5.8?

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