Data object in push event is empty for Chrome Extension

[asagabandi]

Describe your environment

Operating System version: macOS (11.5.2)
Browser version: Google Chrome (95.0.4638.69)
Firebase SDK version: 7.16.1
Firebase Product: messaging

Describe the problem

Trying to use Firebase Cloud Messaging in Chrome Extension. Was able to register firebase messaging service worker and retrieve the token from SDK, but push notifications doesn't work. Upon sending a test notification from Firebase Cloud Messaging, service worker code gets fired, but setBackgroundMessageHandler doesn't get executed since payload is empty.

Steps to reproduce:

Sample project you can find here: https://github.com/asagabandi/firebase-messaging-chrome-extension

Relevant Code:

Part of the code, where setBackgroundMessageHandler should be called:

messaging.setBackgroundMessageHandler((payload) => {
    console.log('[firebase-sw.js] Received background message ', payload);
    const notificationTitle = 'Firebase notification';
    const notificationOptions = {
        body: 'Test firebase notification',
        icon: 'Sample logo'
    };
    return self.registration.showNotification(notificationTitle, notificationOptions);
});