Note: If you have installed third party applications to block pop-ups (examples include the Google, MSN, and Yahoo! toolbars), be sure to consult the vendor documentation to allow pop-up windows for desired websites. Mozilla Firefox.current (Windows/macOS).Some popular Penn-affiliated websites requiring pop-ups include the Penn Online Directory.įollow the instructions below to configure your web browser to allow pop-up windows for your selected websites. While this may eliminate unwanted or bothersome pop-up windows, the feature sometimes can impede the functionality of legitimate or useful websites. Most web browsers include a feature to block pop-up windows.