Examine source code of Audio Whisper Detector

{
  "manifest_version": 2,
  "name": "Audio Whisper Detector",
  "version": "1.0",
  "description": "Boosts quiet audio sections on websites.",
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "detector.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{60d29566-48e4-40c8-827e-2e0a28a68e51}"
    }
  }
}