Google Cloud Messaging

gcm

Low RiskCategory: CommunicationView Official Docs↗

Technical Context

Enables access to Google Cloud Messaging (now Firebase Cloud Messaging) for receiving push notifications from external servers. This allows real-time updates without constant polling.

What This Means For You

The extension can receive instant notifications from its servers without constantly checking for updates. This enables real-time features like chat notifications.

Related APIs

This permission enables access to these Chrome APIs:

chrome.gcm

Common Use Cases

✓Chat apps
✓Email notifiers
✓Real-time updates

How to Declare in manifest.json

Add the "gcm" permission to your extension manifest:

{
  "manifest_version": 3,
  "name": "My Extension",
  "permissions": [
    "gcm"
  ]
}

Related Permissions

Runtime

runtime

This allows different parts of the extension to communicate with each other. It also enables the extension to respond when Chrome starts or when you click its icon.

low

Identity

identity

The extension can sign into services on your behalf using Google login or other authentication providers. By itself, it cannot see your email address.

low

Native Messaging

nativeMessaging

The extension can talk to other programs installed on your computer, not just things in the browser. This is used by password managers and system utilities.

high

Web Navigation

webNavigation

The extension can see when you navigate to different pages and how you got there, like clicking a link or using back/forward. It sees URLs as you browse.

high

Web Authentication Proxy

webAuthenticationProxy

The extension can intercept security key authentication requests. This is highly specialized and used for remote access to security keys.

high