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I cannot use the downloaded firefox on my Mac. Am I wasting my time or is there a version that works on my specific computer?

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When I double clicked on the Firefox I had downloaded it told me that Firefox did not work on Mac OS X.

When I double clicked on the Firefox I had downloaded it told me that Firefox did not work on Mac OS X.

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Firefox 3.6.19 works with Masc OSX 10.4.11.

http://www.mozilla.com/en-US/firefox/all-older.html