Examine source code of Classic Dungeon Game

{
  "manifest_version": 3,
  "name": "Classic Dungeon Game",
  "version": "1.0.1",
  "action": {
    "default_icon": {
      "24": "img/24x24.png",
      "32": "img/32x32.png"
    },
    "default_title": "2048!",
    "default_popup": "index.html"
  },
  "description": "Play Classic Dungeon Game right on Your Fire Fox!",
  "icons": {
    "16": "img/16x16.png",
    "48": "img/48x48.png",
    "128": "img/128x128.png"
  },
  "options_page": "index.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "{66c4f47e-81ed-4096-9516-b738d7e7791f}",
      "strict_min_version": "105.0"
    }
  }
}