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firefox 4 is not working on mac os how do I reinstall 3.17

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firefos 4 was downloaded, does not work with this Mac os need version that will

firefos 4 was downloaded, does not work with this Mac os need version that will

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Firefox 4 requires at least OS X 10.5 and an Intel Mac. You can get the latest version of Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html