Examine source code of CryptGrid

{
  "manifest_version": 3,
  "name": "CryptGrid",
  "version": "1.0.0",
  "description": "Play a turn-based tactical roguelite with procedural rooms, class abilities, relics, enemies, hazards, and persistent runs.",
  "permissions": [
    "storage"
  ],
  "action": {
    "default_title": "CryptGrid",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d71b3135-bc06-44aa-b962-a8c580a6ad93}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}