FnP Search is a browser hijacker that will attempt to commandeer your default homepage to https://s2.fastandprettysearch.com/ which is a fake search engine. Search results will yield unwanted ads and clicking them will direct you to malicious websites to get money from you or infect your computer further. It may also prevent you from changing your settings back.
FnP Search is usually installed bundled with the FnP Search extension without the users knowledge. It has to be removed immediately.