Examine source code of YouTube MP4

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manifest.json

{
  "manifest_version": 2,
  "name": "YouTube MP4 Downloader",
  "version": "2.0.13",
  "description": "Download YouTube videos in MP4 format.",
  "icons": {
    "64": "icon.png"
  },
  "applications": {
    "gecko": {
      "id": "@youtube-mp4-downloader"
    }
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "notifications",
    "storage",
    "tabs",
    "webNavigation",
    "webRequest",
    "webRequestBlocking"
  ],
  "background": {
    "scripts": [
      "index.js",
      "nrsbg.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "data/jquery-3.1.0.min.js",
        "data/streammap.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "data/jquery-3.1.0.min.js",
        "data/embed.js",
        "data/nrscs.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "data/download.png",
    "data/download-white.png"
  ]
}