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Where can I go to download an older version of Firefox?

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I am using OS X 10.5.8 on a PowerPC G5, but when I attempt to download Firefox from the Mozilla site, I get an error message that says my operating system is not compatible.

I am using OS X 10.5.8 on a PowerPC G5, but when I attempt to download Firefox from the Mozilla site, I get an error message that says my operating system is not compatible.

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For older Macs that aren't supported in Firefox 4 / 5 / 6, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 .
http://www.floodgap.com/software/tenfourfox/
http://code.google.com/p/tenfourfox/downloads/list

Or use 3.6.21
http://www.mozilla.com/en-US/firefox/all-older.html