Examine source code of Quick Page Screenshot

{
  "manifest_version": 3,
  "name": "Quick Page Screenshot",
  "version": "1.0.0",
  "description": "Capture the visible area of the current tab as a PNG and save it with one click.",
  "action": {
    "default_title": "Capture visible area (PNG)"
  },
  "permissions": [
    "tabs",
    "downloads",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "quick-page-screenshot@trituenhantao.local",
      "strict_min_version": "115.0"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  }
}