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I have an iMac OSX 10.6.6. When I tried to download a newer Firefox, I got the popup:"you have chosen to open Firefox 6.0.dmg which is a dmg file. What should Firefox do with this file?" with the options to "Open With" or "Save File." What to do?

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I have an iMac OSX 10.6.6. When I tried to download a newer Firefox, I got the popup:"you have chosen to open Firefox 6.0.dmg which is a dmg file. What should Firefox do with this file?" with the options to "Open With" or "Save File." What to do?

I have an iMac OSX 10.6.6. When I tried to download a newer Firefox, I got the popup:"you have chosen to open Firefox 6.0.dmg which is a dmg file. What should Firefox do with this file?" with the options to "Open With" or "Save File." What to do?

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