You will need to install a user script manager extension to install this script.
This script should not be not be installed directly. It is a library for other scripts to include with the meta directive
// @require https://greasyfork.org/scripts/457244-download-corner-pop-black-red-theme/code/download%20corner%20pop%20black-red%20theme.js?version=1132550
black-red theme for download corner pop