Examine source code of Thumbnail Preview Tool

{
  "manifest_version": 2,
  "name": "Thumbnail Preview Tool",
  "version": "1.0",
  "description": "Preview thumbnails on YouTube, TikTok, and Instagram.",
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{95405e8b-cf3e-44df-9c2b-0f3e78e0ffce}"
    }
  }
}