Examine source code of dmitlichess

{
  "name": "dmitlichess",
  "version": "0.5.701",
  "manifest_version": 3,
  "description": "Adds top-level grandmaster commentary to lichess.org (audio)",
  "browser_specific_settings": {
    "gecko": {
      "id": "vincent@vincentsimard.com",
      "strict_min_version": "57.0"
    }
  },
  "icons": {
    "16": "images/icon-16.png",
    "128": "images/icon-128.png"
  },
  "default_locale": "en",
  "action": {
    "default_icon": "images/dmitri.png",
    "default_title": "dmitlichess",
    "default_popup": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*.lichess.org/*",
        "https://*.lichess.org/*"
      ],
      "css": [],
      "js": [
        "vendor/webextension-polyfill/dist/browser-polyfill.min.js",
        "scripts/UserPrefs.js",
        "scripts/AudioUtils.js",
        "scripts/MutationUtils.js",
        "scripts/AudioQueue.js",
        "scripts/MoveEmitter.js",
        "scripts/GameStateEmitter.js",
        "scripts/Dmitlichess.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "ogg/*"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage"
  ]
}