Examine source code of Used product icon

{
  "manifest_version": 2,
  "name": "Used product icon",
  "version": "1.0",
  "description": "The used product icon is usually a small image that appears next to the product name or in the product description to help users easily recognize the product's condition is no longer 100% new.",
  "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": "{94a27bf9-7e89-4983-8f6d-0298c7d817b9}"
    }
  }
}