When I drag the update to my applications folder it says this error message: action cannot be completed because you not have suficient security privilages for some items.

I've downloaded the latest version of Firefox, but when I try to move the icon to my applications folder (MAC) I get an error message: cannot be completed because you don't have sufficient security privileges.

https://support.mozilla.com/en-US/kb/Installing+Firefox+on+Mac

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