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how to revert to firefox 3

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I downloaded the new version of Firefox and it won't open on my Mac. How do I revert to the previous version. I am running OSX 10.4.1. Thanks

I downloaded the new version of Firefox and it won't open on my Mac. How do I revert to the previous version. I am running OSX 10.4.1. Thanks

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mozillamarcia, the OP is using an Intel Mac so they will not be able to use the unofficial version from tenfourfox, as that one requires a PPC mac.