Examine source code of 2048 Puzzle Game

{
  "manifest_version": 3,
  "version": "1.0.0",
  "id": "contact@2048-online.io",
  "name": "__MSG_appName__",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "author": "Alfred Torbjonsen",
  "homepage_url": "https://2048-online.io/",
  "short_name": "2048 Game",
  "browser_specific_settings": {
    "gecko": {
      "id": "contact@2048-online.io"
    }
  },
  "action": {
    "default_icon": {
      "16": "images/icon16.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    },
    "default_title": "Play 2048",
    "default_popup": "popup.html"
  }
}