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My firefox is missing on the hard drive and my mac cannot read the latest version of firefox that I downloaded

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My firefox browser is missing from my mac hard drive. I went to download a new version and it will not work with a mac that is older than OS 10.5. I can't find a downloadable version of Firefox that will work with my OS 10.4

My firefox browser is missing from my mac hard drive. I went to download a new version and it will not work with a mac that is older than OS 10.5. I can't find a downloadable version of Firefox that will work with my OS 10.4

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Firefox 3.6.19 is available here.
http://www.mozilla.com/en-US/firefox/all-older.html