First of all, you have to mention which browser are you using. Every browser has different methods. Most people use Google Chrome. Click on three dots from the right top corner of the chrome browser. Now click on settings and from settings go to content settings. Click on pop up and redirects and select what do you want to enable or disable.
Google has been updated its browser Google Chrome. Last year there were lots of fake websites which tried to compromise users information that’s why Google has blocked its pop up window. Google Chrome auto open pop up windows now is blocked due to safety reason.
Now if you are opening any website which contains pop up, will ask permission for opening any pop-up. So no need to worry about pop up if you are using Google Chrome browser.