Pop-up windows can be helpful or distracting. Some websites require you to allow pop-ups. For example, a bank website might show your monthly statements in pop-ups. Other websites might fill your screen with pop-up ads. You can allow or block pop-ups on individual websites or all websites. If you’re not sure whether you want to block pop-ups on a website, you can choose to block and be notified when the site wants to display a pop-up, then decide if you want to show the pop-up.