SSC is a Chrome extension for monitoring websites and getting notified when they start and stop behaving. The extension runs in the background, constantly checking a website for its status. It is designed to notify you of any website issues. 

It works for websites that are hosted on the Google Cloud Platform.

When a website is not behaving, it will notify you with a notification. The site name and the status code are shown.

To stop the notification, you can simply click on the notification and get back to the previous site. It has a list of values that can be used, such as the ones you may be familiar with. SSC also checks for 503 and 504 status codes as well.