Examine source code of UG Local Audio

{
  "manifest_version": 3,
  "name": "UG Local Audio",
  "version": "1.0.0",
  "author": "Roman Lefler",
  "homepage_url": "https://github.com/romanlefler/ug-local-audio",
  "description": "Play your local audio files on the Ultimate Guitar website.",
  "icons": {
    "48": "icon-48.png",
    "96": "icon-96.png",
    "128": "icon-128.png"
  },
  "host_permissions": [
    "https://tabs.ultimate-guitar.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://tabs.ultimate-guitar.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ug-local-audio@romanlefler.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "developer": {
    "name": "Roman Lefler",
    "url": "http://romanlefler.com"
  }
}