Examine source code of Skyscraper Icon

{
  "manifest_version": 2,
  "name": "Skyscraper Icon",
  "version": "1.0",
  "description": "Skyscraper icons are often modern, tall, and represent urbanization.",
  "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": "{04e9ed2c-6c5f-4ea0-927c-95b3e0ea54b1}"
    }
  }
}