Examine source code of Random Password Generator

{
  "manifest_version": 3,
  "name": "Random Password Generator",
  "version": "1.1",
  "description": "Generates random strong passwords.",
  "permissions": [],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "passgen@smitelt.com"
    }
  }
}