Link popup selector works similarly as Link selector. It can be used for url extraction and site navigation. The only difference is that Link popup selector should be used when clicking on a link the site opens a new window (popup) instead of loading the URL in the same tab or opening it in a new tab. This selector will catch the popup creation event and extract the URL. If the site creates a visual popup but not a real window then you should try Element click selector
Note! when selecting these link elements you can move the mouse over the element and press "S" to select it to prevent it from opening a popup.
See Link selector use cases.