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Why the "Import Data from Another Browser" option cannot be chosen

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I click on History on the menu, then, Show All History option, a new window appears called Library. I click on the button: 'Import and Backups', a drop down menu appears with the option 'Import Data from Another Browser'; however, this option in my browser is light gray, i.e. I cannot choose it. Why?

I click on History on the menu, then, Show All History option, a new window appears called Library. I click on the button: 'Import and Backups', a drop down menu appears with the option 'Import Data from Another Browser'; however, this option in my browser is light gray, i.e. I cannot choose it. Why?

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Are you in the Private Browsing mode when you try that Import menu item?

http://support.mozilla.com/en-US/kb/Private+Browsing