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not compatible with OS X 10.5.8 on pre-Intel processor

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I downloaded Firefox and when I tried to open it a message said it was not compatible with this architecture. I am running on a Mac mini with a pre-Intel processor and OS X10.5.8

I downloaded Firefox and when I tried to open it a message said it was not compatible with this architecture. I am running on a Mac mini with a pre-Intel processor and OS X10.5.8

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Firefox 3.6.x is the last available from Mozilla for PPC Macs.
http://www.mozilla.com/en-US/firefox/all-older.html

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/
https://code.google.com/p/tenfourfox/wiki/PluginsNoLongerSupported