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Each time I try to install version 4.0.1 I get the following message:"this operation cannot be completed because you do not have sufficient privileges for some of these items." How can I overcome this?

Each time I try to install version 4.0.1 I get the following message:"this operation cannot be completed because you do not have sufficient privileges for some of these items." How can I overcome this?

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Download a new copy of the Firefox program and save the DMG file to the desktop

Your profile data is stored elsewhere in the Firefox Profile Folder, so you won't lose your bookmarks and other personal data.