Examine source code of ScribeCount

{
  "description": "ScribeCount helps indie authors and publishers to track their Royalties and Profits across platforms and marketplaces.",
  "version": "1.5.7.6",
  "name": "ScribeCount",
  "background": {
    "persistent": true,
    "page": "background.html"
  },
  "browser_action": {
    "default_title": "Click to initiate sync data and open ScribeCount",
    "default_icon": "icon-34.png"
  },
  "icons": {
    "16": "icon-16.png",
    "34": "icon-34.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "permissions": [
    "tabs",
    "alarms",
    "webRequest",
    "webRequestBlocking",
    "https://*.scribecount.com/*",
    "https://*.amazon.com/*",
    "https://*.amazon.co.uk/*",
    "https://*.amazon.ca/*",
    "https://*.amazon.com.mx/*",
    "https://*.amazon.com.br/*",
    "https://*.amazon.de/*",
    "https://*.amazon.it/*",
    "https://*.amazon.sa/*",
    "https://*.amazon.com.tr/*",
    "https://*.amazon.es/*",
    "https://*.amazon.fr/*",
    "https://*.amazon.in/*",
    "https://*.amazon.ae/*",
    "https://*.amazon.nl/*",
    "https://*.amazon.se/*",
    "https://*.amazon.pl/*",
    "https://*.amazon.eg/*",
    "https://*.amazon.co.jp/*",
    "https://*.amazon.com.au/*",
    "https://*.amazon.sg/*",
    "https://*.amazon.cn/*",
    "https://*.amazonaws.com/*",
    "https://*.barnesandnoble.com/*",
    "https://*.kobo.com/*",
    "https://*.draft2digital.com/*",
    "https://*.apple.com/*",
    "https://*.google.com/*",
    "https://*.googleusercontent.com/*",
    "https://*.smashwords.com/*",
    "https://*.ingramspark.com/*",
    "https://*.findawayvoices.com/*",
    "https://*.findawayworld.com/*",
    "https://voices.inaudio.com/",
    "cookies",
    "*://*.findawayvoices.com/*",
    "*://*.findaway.com/*",
    "*://*.inaudio.com/*",
    "*://*.acx.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.scribecount.com/*"
      ],
      "js": [
        "myContentScript.bundle.js"
      ]
    }
  ],
  "manifest_version": 2,
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{1f3de61d-5903-4598-8c3c-89cff1ba071d}"
    }
  }
}