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Just install Poper Blocker and from that moment on, any time a new pop-under or pop-up window is about to pop, it will be automatically blocked and a notification will be shown. You can view the blocked content by clicking on its link in the notification. “Allow always” will suppress the blocking of any future content generated by the current website and add it to the whitelist.
The whitelist can be managed by the extension’s options page. ...