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/405927-utillibrary/code/UtilLibrary.js?version=881919
!!! NOT MEANT FOR PUBLIC USE !!!
Feel free to use the library, if you find it useful, but the library is not meant for public use.
I would recommend copying the code into your own library, rather than using this library as-is.
If you do decide to use the library, be ready to expect: