Firefox will not download to my mac. It says it's not recognized. Suggestions?

WHEN I TRIED TO DOWNLOAD FIREFOX ON TO MY NEW MACBOOK, I RECEIVED THE MESSAGE 'DISK IMAGE NOT MOUNTED. THIS THEN CHANGED TO A FILE NOT RECOGNIZED MESSAGE. I NEVER GOT THE FIREFOX ICON. NOTHING.
THANKS

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Doublechecking before proceeding ... is that the itunes.msi or itunes64.msi files that can't be found? Or is it some other file?

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Firefox will not download to my mac. It says it's not recognized. Suggestions?

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