![Download the new version uBlock Origin 1.51.0](https://cdn1.cdnme.se/5447227/9-3/14_64e61dfbddf2b36505b4c7c8.png)
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Example of a filter using the new popunder filter option: This effectively take care of the easy to reproduce case in issue #991. They are essentially the reverse of what is happening with nuisance popups, where the nuisance content is opened in a new tab or window. Popunders are when a web page opens a new legitimate content in another tab or window, while at the same time loading nuisance content in the current tab. This gives uBlock Origin the ability to block popunders.
![Download the new version uBlock Origin 1.51.0](https://cdn1.cdnme.se/5447227/9-3/14_64e61dfbddf2b36505b4c7c8.png)