Examine source code of Sand Castle Icon

{
  "manifest_version": 2,
  "name": "Sand Castle Icon",
  "version": "1.0",
  "description": "The sand castle icon is an iconic image of the beach, childhood and summer.",
  "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": "{766e2d5b-52e6-4650-a2d4-7ebe9e657cd8}"
    }
  }
}