Coinhive is a script to mine with your browser, but many antivirus now classified it as virus (wrong), you can simply disable it from settings and again it's not something that can harm your computer/server/raspberry/etc...

If you are a noob it's not my bad. And yes it's completely open source (no lie) just check the source code and remove what you want...ah no sorry you are a noob... So don't blame me and my software, blame your ignorance.