Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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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/