Examine source code of JSON valid

{
  "manifest_version": 2,
  "name": "JSON valid",
  "version": "1.1",
  "icons": {
    "48": "icons/json.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/json.png",
    "default_title": "JSON valid",
    "default_popup": "popup/index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0436804c-298b-4ff0-8cb1-def38389e842}"
    }
  }
}