Examine source code of Papaya icon

{
  "manifest_version": 2,
  "name": "Papaya icon",
  "version": "1.0",
  "description": "The papaya fruit symbol is rich in vitamins, good for digestion, associated with agricultural areas and the countryside atmosphere.",
  "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": "{8a6a7c0a-33a2-4a8e-9258-51e12794dd65}"
    }
  }
}