Examine source code of World map icon

{
  "manifest_version": 2,
  "name": "World map icon",
  "version": "1.0",
  "description": "World map icons are often used in travel, geography, global social networking, or international shipping services.",
  "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": "{ff827968-e668-434b-a13b-d756b95f4e1d}"
    }
  }
}