Blocking pop-up windows
Some webpages display pop-up windows. For example, a webpage might use a pop-up window to request your user name or to display ads. You can block these pop-up windows.
To block pop-up windows:
Choose Action menu > Block Pop-Up Windows so that a checkmark appears next to it. (The Action menu is near the upper-right corner of the Safari window, and looks like a gear.)
Blocking pop-up windows stops only those windows that appear when you open or close a page. It does not block pop-up windows that open when you click a link.
If you block pop-up windows, you might miss important information for a webpage.