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manifest.json

{
  "manifest_version": 2,
  "name": "YouTube: Play Only Audio",
  "version": "1.0.5",
  "description": "Turn off video of any YouTube video and play only its audio.",
  "permissions": [
    "webRequest",
    "*://www.youtube.com/*",
    "*://*.googlevideo.com/*"
  ],
  "icons": {
    "16": "assets/Logo@16.png",
    "32": "assets/Logo@32.png",
    "48": "assets/Logo@48.png",
    "96": "assets/Logo@96.png",
    "128": "assets/Logo@128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "youtube.js"
      ],
      "run_at": "document_start"
    }
  ]
}