Examine source code of Witch hat icon

{
  "manifest_version": 2,
  "name": "Witch hat icon",
  "version": "1.0",
  "description": "The witch hat icon represents a witch character, wearing a pointed hat, often wearing a cloak and often playing a villainous role in cartoons.",
  "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": "{70f602f1-4cf8-47e6-a5eb-f881ba38e4e2}"
    }
  }
}