Before you install, Greasy Fork would like you to know that this script contains antifeatures, which are things there for the script author's benefit, rather than yours.
This script will inject ads on the sites you visit.
The author of this script explains:
ALL ADS ARE REMOVED BY DEFAULT. If you like the script, you have the OPTION can enable a setting that will REPLACE the ads on MooMoo.io with new ads that will be used to compensate ALL the developers who collaborated on this script.