manifest.json

{
  "manifest_version": 3,
  "name": "My Extension",
  "version": "1.0.0",
  "description": "A helpful Chrome extension.",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "My Extension"
  },
  "background": {
    "service_worker": "background.js"
  },
  "permissions": [
    "storage"
  ]
}

Want the whole extension, not just the manifest?

ManifestGo writes the popup, service worker and scripts for you with AI.

Build this extension with AI

What is Manifest V3?

Manifest V3 is the current Chrome extension format. It replaces background pages with service workers, moves host access into host_permissions, and blocks remotely hosted code. Every extension needs a manifest.json at its root.

Ask for as few permissions as you can — fewer permissions means fewer install warnings and faster Chrome Web Store review. New to extensions? Read our step-by-step guide.