How to Block Pop Unders


Pop-under advertisements that are initiated by websites that you visit can be blocked from your web browser. Changing the settings in your web browser to block pop-under ads will also prevent pop-up ads from displaying. Pop-unders can only be blocked using your web browser if they are opened by web sites that you visit. Pop-under advertisements that pop as a result of adware installed on your computer must be removed from the system using an adware or spyware removal program.

Google Chrome

  • Open the Google Chrome browser from your Windows desktop. Click the blue wrench-shaped icon in the upper right-hand corner of the browser.

  • Choose "Options" from the menu that appears underneath the wrench icon. Click the "Under the Hood" label in the Google Chrome Options window.

  • Click "Content settings..." underneath the "Privacy" heading. Click the "Pop-ups" tab.

  • Left click the bubble next to the text that reads, "Do not allow any site to show pop-ups." Click "Close." Pop-under and pop-up ads will now be blocked in Chrome.

Mozilla Firefox

  • Launch Mozilla Firefox from your computer's desktop or "Start" menu. Left click on the "Tools" button located on the menu bar towards the top of the Firefox window.

  • Select "Options" from the drop-down menu that appears. Left click on the "Content" icon near the top of the window that opens.

  • Click the empty box next to "Block Popup Windows" to place a check mark in it. Click "OK" at the bottom of the "Options" window. Restart Firefox by closing the browser and opening it back up. Pop-up and pop-under ads will now be blocked automatically.

Apple Safari

  • Start the Safari browser from your computer's desktop. Click "Safari" in the left corner of the menu bar (next to the Apple icon).

  • Move your cursor to highlight the "Block Pop-Up Windows" option in the menu. Click on "Block Pop-Up Windows" to place a check mark next to the text.

  • Restart the Safari browser. Both pop-under and pop-up ads will now be blocked by Safari.

Microsoft Internet Explorer

  • Open Internet Explorer from the Windows desktop. Click on the button labeled "Tools" underneath the address bar.

  • Scroll over the "Pop-up Blocker" button to highlight it in the menu that appears. Left click "Turn on Pop-up Blocker" in the small menu that displays to the right.

  • Click "Yes" when the prompt asking if you are sure that you would like to turn on the Internet Explorer Pop-up Blocker appears. Internet Explorer will now block pop-ups and pop-unders initiated by websites.


  • Double click on the Opera icon on your desktop to open the browser. Single click on the "Tools" button located on the Opera menu bar.

  • Select "Quick preferences" in the window that is opened. Choose "Block all pop-ups" from the list of available options.

  • Click the "OK" button to save the pop-up blocker settings. Close any Opera windows that are open on your computer. Reopen Opera and the settings blocking pop-unders and pop-ups will take effect.

Tips & Warnings

  • The pop-up blocking feature within web browsers cannot block pop-unders or pop-ups that display as a result of adware.

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