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firefox 4 downloaD "mounting failed" need help

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I recently had my mac reformatting and lost firefox so when I treied to download it I ended up getting the message above"mounting failed" or "image failed".I tried twice..Mac OSX 10.3.9

I recently had my mac reformatting and lost firefox so when I treied to download it I ended up getting the message above"mounting failed" or "image failed".I tried twice..Mac OSX 10.3.9

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Firefox 2.0.0.20 is the last ever release for Mac OSX 10.3.9 and earlier versions.
Get it here:
https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/2.0.0.20/mac/en-US/