Examine source code of YouTube Lyrics Overlay

{
  "manifest_version": 3,
  "name": "YouTube Lyrics Overlay",
  "version": "0.1.1",
  "description": "Muestra letras sincronizadas y traducciones sobre el reproductor de YouTube.",
  "icons": {
    "16": "icons/16.svg",
    "32": "icons/32.svg",
    "48": "icons/48.svg",
    "96": "icons/96.svg"
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "host_permissions": [
    "https://lrclib.net/*",
    "https://api.mymemory.translated.net/*",
    "https://apertium.org/*",
    "https://libretranslate.com/*"
  ],
  "optional_host_permissions": [
    "https://*/*",
    "http://localhost/*",
    "http://127.0.0.1/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*",
        "https://m.youtube.com/*",
        "https://music.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "action": {
    "default_title": "YouTube Lyrics Overlay",
    "default_icon": {
      "16": "icons/16.svg",
      "32": "icons/32.svg"
    }
  },
  "commands": {
    "toggle-lyrics": {
      "suggested_key": {
        "default": "Alt+Shift+L"
      },
      "description": "Mostrar u ocultar letras"
    },
    "toggle-translation": {
      "suggested_key": {
        "default": "Alt+Shift+T"
      },
      "description": "Activar o desactivar traduccion"
    },
    "offset-forward": {
      "suggested_key": {
        "default": "Alt+Shift+Right"
      },
      "description": "Retrasar la letra 250 ms"
    },
    "offset-backward": {
      "suggested_key": {
        "default": "Alt+Shift+Left"
      },
      "description": "Adelantar la letra 250 ms"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube-lyrics-overlay@example.local",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ]
      }
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self' 'wasm-unsafe-eval'; worker-src 'self'; object-src 'none'"
  }
}