Examine source code of Lingo Labyrinth

{
  "manifest_version": 2,
  "name": "Lingo Labyrinth",
  "version": "1.0",
  "description": "Navigate through engaging multiple-choice vocabulary challenges. Build your English word power with fun, daily brain-training exercises designed to expand your lexicon.",
  "icons": {
    "48": "lingo_labyrinth_logo.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Lingo Labyrinth"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{625d1287-56c2-4ee1-9229-a06fce078155}",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}