Option 01.
Navigate to and open '~/Library/Applications Support/AddressBook/'.
If a window titled 'AddressBook' exists and contains files and folders - you may have a chance of data recovery. If the folder exists but is empty - the contents have been removed (and data recovery may be possible) or deleted (and thus, no chance of recovery). If the 'AddressBook' folder does not exist, it may have been relocated or renamed (and data recovery may be possible), or deleted (and thus, no chance of recovery).
Option 02.
01. Select and copy (select the current web browsers' 'Edit, Copy' menu item or press 'Command C') ...
~/Library/Applications Support/AddressBook/
02. Select 'Finder's 'Go, Go to Folder...' menu item, or 'Command <shift> G'. A window or drop down sheet will appear.
03. Perform a paste (select the current web browsers' 'Edit, Paste' menu item, or press 'Command V').
04. Click the 'Go' button.
If a window titled 'AddressBook' appears - with files and folders, you may have a chance of data recovery. If the folder appears but is empty or the 'Go to Folder' titled window or 'Go to the Folder:' drop down sheet displays a 'The folder cannot be found' error - the 'AddressBook' folder may have been relocated or renamed (and data recovery may be possible), or deleted (and thus, no chance of recovery).
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Note '~' or '$HOME' represents the path to the 'current users' Home folder.
