Examine source code of Sook

{
  "name": "Sook",
  "version": "1.13",
  "description": "Browse online. Buy from the boutique next door.",
  "manifest_version": 2,
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": {
      "16": "assets/icons/logo-16.png",
      "32": "assets/icons/logo-32.png",
      "48": "assets/icons/logo-48.png",
      "128": "assets/icons/logo-128.png"
    }
  },
  "background": {
    "page": "index.html",
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.amazon.com/*",
        "https://*.amazon.ca/*",
        "https://*.amazon.co.uk/*"
      ],
      "js": [
        "assets/js/content.js"
      ]
    },
    {
      "matches": [
        "https://*.zara.com/*"
      ],
      "js": [
        "assets/js/zaraParser.js"
      ]
    },
    {
      "matches": [
        "https://*.gap.com/*"
      ],
      "js": [
        "assets/js/gapParser.js"
      ]
    },
    {
      "matches": [
        "https://*.asos.com/*"
      ],
      "js": [
        "assets/js/asosParser.js"
      ]
    },
    {
      "matches": [
        "https://*.macys.com/*"
      ],
      "js": [
        "assets/js/macysParser.js"
      ]
    },
    {
      "matches": [
        "https://*.uniqlo.com/*"
      ],
      "js": [
        "assets/js/uniqloParser.js"
      ]
    },
    {
      "matches": [
        "https://*.nordstrom.com/*"
      ],
      "js": [
        "assets/js/nordstromParser.js"
      ]
    },
    {
      "matches": [
        "https://welcome-dev.shopyoursook.com/success",
        "https://welcome.shopyoursook.com/success"
      ],
      "js": [
        "assets/js/sookWeb.js"
      ]
    }
  ],
  "permissions": [
    "geolocation",
    "identity",
    "storage"
  ],
  "icons": {
    "16": "assets/icons/logo-16.png",
    "32": "assets/icons/logo-32.png",
    "48": "assets/icons/logo-48.png",
    "128": "assets/icons/logo-128.png"
  }
}