Examine source code of Approval barcode symbol

{
  "manifest_version": 2,
  "name": "Approval barcode symbol",
  "version": "1.0",
  "description": "An approval barcode symbol is typically a combination of a barcode image and a confirmation mark (such as a check mark ✅, a seal 🛡️, or a.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Click me!"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{fd1136dd-7986-4789-bdb6-6f2161711e08}"
    }
  }
}