Safari 12 (Mac) - Using the Popup Blocker
This document explains how to enable and disable Safari's popup blocker. For general information on popup blockers, see Popup Blocker - FAQ
Click Safari, and then click Preferences.
Click the Websites tab and locate Pop-up Windows on the left side.
In the bottom right, toggle the drop-down menu labelled When visiting other websites to your preferences. You may also whitelist currently-open websites on this screen.