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accessibility.tabfocus controls what elements receive focus when the user presses the Tab key.
Note: On Mac OS X, if this preference is not set, the Full Keyboard Access setting in System Preferences > Keyboard is honored.
- Give focus only to text fields (default on Mac OSX)
- Give focus to all form elements except text fields.
- Give focus only to links and linked images.
- You can add these values to combine their functionality. The value 7 (give focus to all elements) is the default on Windows and Linux.