Examine source code of Weather Words Whirl

{
  "manifest_version": 2,
  "name": "Weather Words Whirl",
  "version": "1.0",
  "description": "Master English weather idioms and expressions! Each clue gives a Vietnamese meaning or context — guess the exact English phrase. Perfect for learners who want to sound natural when talking about the weather.",
  "icons": {
    "48": "weather_icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Weather Words Whirl"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d436e501-da2e-49f0-84be-aefc02baff1a}",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}