Examine source code of Frame Sync Audio Delay

{
  "manifest_version": 3,
  "name": "Frame Sync (Fix for Wireless Audio Delay)",
  "version": "1.8.1",
  "description": "Frame Sync is the best solution for wireless audio delay, syncing video with audio for lag-free playback",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": true
    }
  ],
  "icons": {
    "256": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "framesync@example.com",
      "strict_min_version": "109.0"
    }
  }
}