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manifest.json
{
  "name": "YTCool",
  "description": "Beautifies YouTube in a way.",
  "version": "2.0",
  "author": "Arkinetic",
  "browser_specific_settings": {
    "gecko": {
      "id": "{daf44bf7-a45e-4350-979c-91cf07434c3d}"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.youtube.com/*"
      ],
      "run_at": "document_start",
      "css": [
        "style.css"
      ]
    }
  ],
  "action": {},
  "permissions": [
    "activeTab"
  ],
  "icons": {
    "64": "/icons/ico_512.png"
  },
  "manifest_version": 3
}