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does not work with Mac OS X Leopard, on G5 Imac, says "not supported etc)

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does not work with Mac OS X Leopard, on G5 Imac, says "not support

does not work with Mac OS X Leopard, on G5 Imac, says "not support

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Firefox 4 is not supported on PowerPC (G3, G4, G5) machines. Only Intel processors support it.

The last supported version of Firefox on your computer is 3.6.17, which is available here.

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For older Macs that aren't supported in Firefox 4.0, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 .
http://www.floodgap.com/software/tenfourfox/