Examine source code of Location update icon

{
  "manifest_version": 2,
  "name": "Location update icon",
  "version": "1.0",
  "description": "This icon represents updating, refreshing, or confirming the current location of a user or object on the map.",
  "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": "{06a91a50-f0e0-4cf4-bf03-7377619abe4e}"
    }
  }
}