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How often have you been browsing a website only for it to finish loading, and regardless of where you click, loads an advert in a separate window? The main difference between this type of advert and the traditional pop-up is that these often load underneath the active browser window, only rearing their ugly heads once you’ve finished browsing. These aren’t pop-ups, but pop-unders.

block pop-unders

As a browser, Chrome Google Chrome - A Fantastic Replacement For Mobile Safari [iOS] Google Chrome - A Fantastic Replacement For Mobile Safari [iOS] Do you use Chrome on your computer to browse the web? A lot of people do, as it is one of the most popular web browsers out there. It runs fast, and it offers a... Read More has long been effective at killing pop-ups but not pop-unders. Poper Blocker is an extension for Chrome which promises to finally kill pop-unders in a similar way to how the browser itself kills pop-ups. By default whenever a pop-under appears, the extension displays a notification with the option of displaying it in case it is something you want to see.

poper blocker

Preferences can be saved to a whitelist, so any websites you frequent that do use these windows can be permanently allowed through the filter. The whitelist can be managed from the preferences page of the extension. The extension only requires access to your data on websites, as opposed to browser history and other personal information.


  • Automatically block pop-unders that appear regardless of where you click on the screen.
  • Notifications displayed each time the app blocks a pop-under.
  • Add a whitelist of sites and manage them from the extension preferences.
  • Similar: CleanWebApp and FlashControl,

Check out Poper Blocker @ Chrome Web Store

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