If you want to block those annoying "Sign in to example.com with google.com" Chrome popups follow these instructions https://support.google.com/chrome/answer/14264742 Select "Block sign-in prompts from identity services".

#GoogleChrome

Learn about third-party sign-in - Computer - Google Chrome Help

Third-party sign-in is a type of federated sign-in that allows you to log in with an identity service, instead of creating unique login credentials for each individual website you visit. If you allow