The string you provided— inurl+viewerframe+mode+motion+my+location+extra+quality —is a set of specific search operators often used to find unsecured network cameras and web-based monitoring systems.
: Turn off Universal Plug and Play on your router to prevent the camera from automatically opening ports to the public internet. inurl+viewerframe+mode+motion+my+location+extra+quality
extra: rarely; it may be treated as a simple text match). Instead, it likely searches for the string extra:quality as it appears in source code or visible text.extra:quality=high or extra:quality=low). The term extra may refer to a secondary or sub-stream.