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Firefox 4 downloaded, won't work with my Mac, lost 3.6.10 where can I find this version to download

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I was running Firefox 3.6.10 and received an update notice to download the latest version. After download and replacement(of new version) in Applications, I tried to open the new file and got a message that this version won't run on my Mac 10.4.11. I want to download Firefox 3.6.10 but cannot find it on the website. Any suggestions???

I was running Firefox 3.6.10 and received an update notice to download the latest version. After download and replacement(of new version) in Applications, I tried to open the new file and got a message that this version won't run on my Mac 10.4.11. I want to download Firefox 3.6.10 but cannot find it on the website. Any suggestions???

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