Two methods to prevent unwanted pop-ups

Add-on or extension software on the browser:
In nowadays is possible to add software extension in the browser to block pop-ups, that software detects if any website is attempting to open a new window and simply blocks the code from being processed. This add-on have the possibility to allow o block any website that give to the user the flexibility and the control over the pop-ups of any website.

Disable Client-Side Scripts (JavaScript):
Normally when we access to a website, the browser run the scripts in the client-site, some of this scripts are for the normal functionality of the site and other are the pop-ups. so, disabling the JavaScripts in the client-site we can block the pop-ups. However there are several issues in this method because disabling the scripts we can limit the functionality of many websites.