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I am running Mac OS X 10.5.8 and I cannot download Firefox 4 because it says it is incompatible with my operating system, although supposedly it is compatible with OS X 10.5

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  • Last reply by TonyE

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I would like to download Firefox 4. I get an error message during download saying it is incompatible with my operating system and that it needs OS X 10.5 or 10.6 but I AM using 10.5.8, so what might be the problem?

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Firefox 4 requires at least OS X 10.5 and an Intel Mac. There is a third party version of Firefox 4 that runs on OS X 10.4/10.5 and PPC Macs, for details see

If you prefer, you can get the latest version of Firefox 3.6 from