Examine source code of Temperature Converter

{
  "manifest_version": 2,
  "name": "Temperature Converter",
  "version": "1.0",
  "description": "Converts temperatures between Celsius, Fahrenheit, and Kelvin.",
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Temperature Converter"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "temperature-converter@example.com"
    }
  }
}