Examine source code of Sudoku - Free

{
  "manifest_version": 2,
  "offline_enabled": true,
  "name": "__MSG_appName__",
  "short_name": "Solitaire",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "version": "3.22.20.1",
  "author": "VAWLT LLC",
  "icons": {
    "16": "icon-16x16.png",
    "32": "icon-32x32.png",
    "48": "icon-48x48.png",
    "128": "icon-128x128.png"
  },
  "browser_action": {
    "default_icon": "icon-32x32.png",
    "default_title": "Sudoku - FREE",
    "default_popup": "popup.html"
  }
}