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Mac computer will not laod firefox 4.0 disk always fails to mount shows as corrupt

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I am trying to upgrade my Mac computer to fire fox 4.0

When download is completed it shows as unable to mount corrupted image

It happened a number of times I am still using Fire fox 2.0

I am trying to upgrade my Mac computer to fire fox 4.0 When download is completed it shows as unable to mount corrupted image It happened a number of times I am still using Fire fox 2.0

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Firefox 4 requires at least OS X 10.5 and an Intel Mac. 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

Firefox 3.6 requires at least OS X 10.4, if you have 10.4 you can get the latest version of Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html

If you have OS X 10.2 - 10.3.9, the last version of Firefox that works is Firefox 2.0.0.20 available from https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/2.0.0.20/mac/en-US/

Mozilla are working to prevent Mac users with non-compatible systems from getting the notification about Firefox 4, and also not displaying the "Download Firefox 4" button on http://www.mozilla.com