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i can't install update firefox 15. i am attaching a screen shot of message i get about "sharing". not sure what to do.

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some items had to be skipped. for each item, choos file- get info- make sure lock is deselected.at this point i can't check "sharing & permissions".

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Try deleting Firefox from your applications folder first. You may have to enter your admin password. Once you've removed it, you should be able to drag in the new version without a problem.