Examine source code of Amazon SellerFlag

{
  "manifest_version": 2,
  "name": "Amazon SellerFlag",
  "version": "1.0",
  "description": "Zeigt das Herkunftsland eines Verkäufers auf amazon.de",
  "icons": {
    "48": "icon-48.png",
    "96": "icon-96.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "sellerflag@proton.me",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.amazon.de/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ]
}