Examine source code of Pdf2DocPro

{
  "background": {
    "scripts": [
      "js/usages.js",
      "js/background.js"
    ]
  },
  "browser_action": {},
  "chrome_url_overrides": {
    "newtab": "html/newTab.html"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "description": "Pdf2DocPro extension allows you to enjoy a free PDF converter",
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "manifest_version": 2,
  "name": "Pdf2DocPro",
  "permissions": [
    "tabs",
    "https://*.pdf2docpro.com/*"
  ],
  "short_name": "Pdf2DocPro",
  "version": "2.0.0.21",
  "web_accessible_resources": [
    "html/js/ConvertAPI.js"
  ]
}