Examine source code of YouTube True Shuffle

{
  "manifest_version": 2,
  "name": "YouTube True Shuffle",
  "version": "1.3.0",
  "description": "Fixes YouTube shuffle to actually be random — no loops, no repeats, optional weighted picks and random seek.",
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon48.png",
      "96": "icons/icon96.png"
    },
    "default_popup": "popup.html",
    "default_title": "YouTube True Shuffle"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "commands": {
    "skip-track": {
      "suggested_key": {
        "default": "Alt+Shift+N",
        "mac": "MacCtrl+Shift+N"
      },
      "description": "Skip to next shuffle track"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "storage",
    "tabs",
    "*://www.youtube.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bdd94b96-e076-4f40-a400-65ac8f488ea7}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}