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Configure a local account thot with no Admin privileges.
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Assign to this user the Autologin at startup.
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Login as thot
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Open the System Preferences panel and select the Dock subpanel
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Position the Dock on the right margin.
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Activate the flag Automatically Hide and show the Dock
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Open Safari and go to the Preferences panel (Safari→Preferences from the menu, or Command+,).
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In the General tab
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At the bottom of the page, There’s the label Open links from applications:. Select the in the current window flag.
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Close the preferences panel and Safari (not only the window, quit the application).
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reboot the computer and check everything.