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Poper Blocker is the first dedicated pop-under blocker that blocks all these annoying popups and popunders that pop no matter where you click on a page. As expected, you can still view the blocked content, if you do so desire, by clicking the link inside the notification's bubble. You will also notice an "Allow Always" button. Press it, and the website will be added to a "Whitelist" section and the blocking for the respective domain will be suppressed.

It's also worth pointing out that the extensions also allows you to suppress the notifications altogether. To enable this, simply visit the extension's Options section. This is also the place where you can whitelist various websites.