Dear Alexander Schlarb, I hope you receive this message. This agent switcher is by far the best I've tested at present. It gets the information correct on the sites I've tested it on. Other add-ons will show a different agent yet reveal under system information my real system information. Your add on doesn't. There's just one thing I would really appreciate, if possible, to set custom screen resolution, is that possible? I hope this review reaches you. Thanks.