Examine source code of JSON Validator

{
  "manifest_version": 2,
  "name": "JSON Validator",
  "version": "1.0",
  "description": "Instantly validate JSON syntax.",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png",
    "default_title": "Validate JSON"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c0f33540-de54-4903-9ded-28dc1f8aacb1}"
    }
  }
}