Examine source code of ConvertoPDF new tab

{
  "manifest_version": 2,
  "version": "1.1.833.771",
  "name": "ConvertoPDF",
  "description": "ConvertoPDF new tab, allows you to view, edit, convert and create PDFs online. Plus get direct access to yahoo search on your Firefox new tab page.",
  "icons": {
    "128": "icons/ConvertoPDF-128.png"
  },
  "background": {
    "scripts": [
      "js/brand.js",
      "js/stat.js",
      "js/nt.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/ConvertoPDF-128.png",
    "default_title": "ConvertoPDF"
  },
  "web_accessible_resources": [
    "icons/checker.gif"
  ],
  "homepage_url": "https://www.convertopdf.com/",
  "content_scripts": [
    {
      "matches": [
        "*://*.convertopdf.com/*"
      ],
      "js": [
        "js/contentScript.js"
      ],
      "css": [
        "css/contentStyle.css"
      ],
      "run_at": "document_start"
    }
  ],
  "chrome_url_overrides": {
    "newtab": "html/newtab.html"
  },
  "permissions": [
    "*://*.convertopdf.com/*",
    "https://service.prsstobe.com/*",
    "https://*.blpsearch.com/*",
    "storage"
  ]
}