Open the app

Open the app at https://fine-ping.glitch.me/.

Open DevTools

Right-click inspect element and select the Debugger tab. Then click command + P to search for and open two files:

• client.js,

• and firebase-messaging-sw.js.

You'll likely need to open the Application tab in DevTools and navigate to the Service Workers side tab. Then click the link for firebase-messaging-sw.js to inspect it in the Sources tab.

Video