Examine source code of Safe Links Auto-Close

{
  "manifest_version": 3,
  "name": "Safe Links Auto-Close",
  "version": "1.0",
  "description": "Automatically closes Microsoft Safe Links tabs after a customizable delay",
  "browser_specific_settings": {
    "gecko": {
      "id": "safe-links-cleanup@emsixteen.com"
    }
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "icons": {
    "48": "icon48.png",
    "96": "icon96.png"
  }
}