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manifest.json
{
  "manifest_version": 3,
  "name": "YouTubeLegacyUI",
  "version": "1.0.0",
  "description": "YouTubeを旧UIにします",
  "icons": {
    "16": "icons/icon_x16.png",
    "48": "icons/icon_x48.png",
    "128": "icons/icon_x128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "css": [
        "css/main.css"
      ]
    }
  ],
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}