Examine source code of Vietnamese Numbers & Time

{
  "manifest_version": 2,
  "name": "Vietnamese Numbers & Time",
  "version": "1.0",
  "description": "Quick popup quiz to practice basic Vietnamese numbers, days, months, and time expressions translated to English. Ideal for beginners!",
  "icons": {
    "48": "vocab_icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Vietnamese Numbers & Time"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{209437bd-f359-4a91-bfac-62f8d227551a}",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}