Unhandled Rejection (SecurityError): The operation is insecure. On a fresh create-react-app project

Question

I created a new project with create-react-app then ran npm start then this showed up. https://imgur.com/a/3By9NCr

Using FF 69.0.3

Answer 1

I had this error occur as well. Was able to clear it up by deleting the create-react-app serviceWorker.js file