Examine source code of NFT Scanner

{
  "description": "Scan your NFT assets.",
  "version": "0.0.7",
  "name": "Nifty Scanner",
  "author": "Indorse",
  "background": {
    "page": "background.html"
  },
  "browser_action": {
    "default_icon": "icon-34.png",
    "default_popup": "info.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "info@indorse.io",
      "strict_min_version": "55.0"
    }
  },
  "permissions": [
    "https://api.opensea.io/api/v1/asset/*",
    "https://api.etherscan.io/*",
    "https://api.airtable.com/v0/*",
    "storage"
  ],
  "icons": {
    "128": "icon-34.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://opensea.io/*"
      ],
      "js": [
        "contentScript.bundle.js"
      ],
      "css": [
        "content.styles.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "content.styles.css",
    "icon-34.png",
    "visual-1.png",
    "visual-2.png",
    "Circle.svg",
    "Rectangle.svg",
    "Triangle.svg",
    "GT-America-Standard-Medium.otf",
    "GT-America-Standard-Regular.otf",
    "GT-America-Standard-Bold.otf"
  ],
  "manifest_version": 2,
  "content_security_policy": "script-src 'self'; object-src 'self'; font-src 'self';"
}