Mobile internet users are also targeted by various types of ads. To limit the display of pop-ups and enjoy a more comfortable browsing experience with your Nokia N9, you can enable the pop-up blocker feature.
Follow the below procedure:
From the Home screen > Tap on Settings > Applications.
Once in the "Manage applications" menu, select "Web".
In the menu that appears, slide the button next to "Block pop-ups" to the right, to enable this feature.