Examine source code of Cactus desert

{
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "name": "Cactus desert",
  "description": "Cactus is a succulent plant that comes in many forms: large trees, shrubs or ground covers.",
  "version": "1.0.0",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{5cca17b3-acf4-48bc-bf78-e002466a0fe0}"
    }
  }
}