Examine source code of Modern YouTube

{
  "manifest_version": 2,
  "name": "Modern YouTube",
  "author": "danicsete",
  "version": "2.3",
  "permissions": [
    "*://www.youtube.com/*"
  ],
  "content_scripts": [
    {
      "js": [
        "Modern_YouTube.js"
      ],
      "run_at": "document_end",
      "matches": [
        "*://www.youtube.com/*"
      ],
      "all_frames": true,
      "match_about_blank": true
    }
  ],
  "icons": {
    "32": "icons/icon.png",
    "48": "icons/icon.png",
    "64": "icons/icon.png",
    "96": "icons/icon.png",
    "128": "icons/icon.png",
    "256": "icons/icon.png"
  }
}