Examine source code of Free shipping icon

{
  "manifest_version": 2,
  "name": "Free shipping icon",
  "version": "1.0",
  "description": "Free Shipping Icon is used to notify customers that they do not have to pay shipping costs when purchasing a product. This icon is commonly seen in e-commerce, sales promotions, and delivery apps.",
  "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": "{c4094135-feca-4c80-a64e-dbeb4577f438}"
    }
  }
}