Examine source code of Getlinkaz Video Youtube Downloader Mp4 HD, Mp3

{
  "name": "Getlinkaz Video Downloader Express",
  "developer": {
    "name": "Getlinkaz",
    "url": "https://www.getlinkaz.com/"
  },
  "description": "Getlinkaz Video Downloader for firefox web-browser with MP3 and Full-HD downloads. Instant, one-click Youtube video downloader with high-quality 256Kbps/128Kbps MP3 and Full-HD video downloading options.",
  "manifest_version": 2,
  "version": "1.0.5",
  "icons": {
    "48": "icons/icon.png"
  },
  "background": {
    "scripts": [
      "includes/purify.min.js",
      "includes/background.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "includes/purify.min.js",
        "includes/getlinkaz-downloader.js"
      ],
      "matches": [
        "http://www.youtube.com/*",
        "https://www.youtube.com/*"
      ],
      "exclude_matches": [
        "http://www.youtube.com/embed/*",
        "https://www.youtube.com/embed/*"
      ],
      "run_at": "document_start"
    }
  ],
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "applications": {
    "gecko": {
      "id": "{4e404be1-51ad-49a0-86b7-fc12a62dbfe9}"
    }
  },
  "web_accessible_resources": [
    "icons/icon.png",
    "icons/icon72.png",
    "options/options.html"
  ],
  "permissions": [
    "<all_urls>",
    "downloads",
    "storage"
  ],
  "incognito": "spanning"
}