Configure a local account thot with no Admin privileges.
Assign to this user the Autologin at startup.
Login as thot
Open the System Preferences panel and select the Dock subpanel
Position the Dock on the right margin.
Activate the flag Automatically Hide and show the Dock
Open Safari and go to the Preferences panel (Safari→Preferences from the menu, or Command+,).
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.
Close the preferences panel and Safari (not only the window, quit the application).
reboot the computer and check everything.