Examine source code of Barcode icon

{
  "manifest_version": 2,
  "name": "Barcode icon",
  "version": "1.0",
  "description": "A barcode symbol is an image representing scanning technology in sales, inventory management, product or payment. It represents a series of parallel black and white lines representing encoded numeric or character information.",
  "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": "{f38020c9-a951-4846-bcc3-d7d3c2dd766b}"
    }
  }
}