Examine source code of Enhancer for YouTube Lite

{
  "manifest_version": 2,
  "name": "Enhancer for YouTube Lite",
  "version": "1.0",
  "description": "Lite version: Cinema mode, Auto HD, Mouse wheel volume, Hide clutter. Local-only.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_title": "Enhancer for YouTube Lite",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "content_script.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0d65d01a-eef7-483e-9131-628b48b59c07}"
    }
  }
}