弹窗杀手Popup Killer is yet another program that automatically closes banned windows. Popup Killer works in the system tray, checks browser windows on a regular interval basis, updates banned windows declared in an XML file, and finally provides ease of use, thanks to hotkeys.-Popup Killer is yet another program that automatically closes banned windows. Popup Killer works in the system tray, checks browser windows on a regular interval basis, updates banned windows declared in an XML file, and finally provides ease of use, thanks to hotkeys.