Examine source code of Rental icon

{
  "manifest_version": 2,
  "name": "Rental icon",
  "version": "1.0",
  "description": "The rental icon is commonly used in applications, websites, or services related to renting property, equipment, housing, vehicles, offices, etc.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Click me!"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0d1e21cb-b330-4a1b-8055-afc2efcf4163}"
    }
  }
}