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