Examine source code of Etsy - Sold out

{
  "name": "Etsy - Sold out",
  "version": "1.0",
  "description": "Show the price of sold out items in etsy",
  "manifest_version": 2,
  "icons": {
    "16": "etsy-sold-out.png",
    "48": "etsy-sold-out.png",
    "128": "etsy-sold-out.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.etsy.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ]
}