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Lolu chungechunge lwabekwa kunqolobane. Uyacelwa ubuze umbuzo omusha uma udinga usizo.

Two versions downloaded. Why and which one do I use?

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Using iMac 21" OS X.8.2

Using iMac 21" OS X.8.2

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What are the different files named? For the Mac, I think you are looking for something like this:

Firefox 15.0.1.dmg

See also: How to download and install Firefox on Mac

If in doubt, you can download again (make sure the Desktop tab is selected, unless you want a mobile version for Android devices).

http://www.mozilla.org/en-US/firefox/fx/#desktop