Examine source code of YouTube Thumbnail Viewer

{
  "manifest_version": 3,
  "name": "YouTube Thumbnail Viewer",
  "version": "1.1",
  "description": "Right click a YouTube Thumbnail to view a full-size version.",
  "permissions": [
    "tabs",
    "menus"
  ],
  "host_permissions": [
    "https://www.youtube.com/*"
  ],
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "background": {
    "scripts": [
      "main.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f272f306-ab66-441f-9f39-01c49c319930}",
      "strict_min_version": "109.0"
    }
  }
}