Examine source code of Luftr Loudness Meter

{
  "manifest_version": 3,
  "name": "Luftr Loudness Meter",
  "short_name": "Luftr Loudness",
  "version": "0.2.0",
  "description": "Real-time browser loudness meter with LUFS, LRA and ITU true-peak monitoring for broadcast, streaming and audio QC.",
  "homepage_url": "https://luftraudio.org/",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage"
  ],
  "action": {
    "default_title": "Open Luftr Loudness Meter",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "luftr-loudness-meter@luftraudio.org",
      "strict_min_version": "151.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}