Examine source code of Youtube NIGHT

{
  "manifest_version": 2,
  "name": "Youtube-NIGHT",
  "version": "0.0.4",
  "description": "New night mode for YouTube and mini fix ui",
  "content_scripts": [
    {
      "all_frames": true,
      "css": [
        "style.css"
      ],
      "matches": [
        "*://youtube.com/*",
        "*://www.youtube.com/*"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "48": "logo.png"
  }
}