Click the arrows to the right of Block and Notify, and choose Block. The website you’re on will be listed in the Currently Open Websites area. Select the Websites tab and on the left click Pop-up windows. Want to be more selective? Instead of a blanket ban, here’s how to turn off pop-ups on specific sites on Mac: How to block pop-ups for specific sites on Mac Notice a difference? Like clearing your search history or removing extensions from Safari, blocking pop-ups is one way to streamline and speed up your Mac. You’re done - Safari is now free of pop-ups! Select the Security icon at the top and check the box for Block pop-up windows. Under the Safari drop-down menu, click Preferences.
You can choose to block all pop-ups or just block specific pop-ups on Macbooks and iMacs. Here’s how to enable a pop-up blocker on Safari.