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Intalling 4.0 on my Mac PowerPC G5 caused me to lose the prior version and 4.0 won't run on my processor. I do I reinstall a prior version?

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Intalling 4.0 on my Mac PowerPC G5 caused me to lose the prior version and 4.0 won't run on my processor. I do I reinstall a prior version?5.8

Intalling 4.0 on my Mac PowerPC G5 caused me to lose the prior version and 4.0 won't run on my processor. I do I reinstall a prior version?'''5.8'''

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There is a third party version of Firefox 4 that runs on OS X 10.4/10.5 and PPC Macs, for details see http://www.floodgap.com/software/tenfourfox

If you prefer, you can get the latest version of Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html