Examine source code of Quick Notes

{
  "manifest_version": 2,
  "name": "Quick Notes",
  "version": "1.0",
  "description": "Create and manage multiple notes!",
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_security_policy": "script-src 'self' https://fonts.googleapis.com; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{f920ec4a-26cc-4dbc-9b04-b343d4ebd2a0}"
    }
  }
}