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manifest.json
{
  "manifest_version": 2,
  "name": "YtdGainPan",
  "version": "1.2",
  "description": "Adds audio controls for ytd-player",
  "browser_specific_settings": {
    "gecko": {
      "id": "YtdGainPan@example.com",
      "strict_min_version": "61.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "all_frames": true,
      "js": [
        "src/ytd-gain-pan.js"
      ],
      "css": [
        "src/ytd-gain-pan.css"
      ]
    }
  ]
}