Examine source code of Math Mini Game Tab

{
  "manifest_version": 2,
  "name": "Math Mini Game Tab",
  "version": "1.0",
  "description": "Solve a simple math puzzle every time you open a new tab!",
  "chrome_url_overrides": {
    "newtab": "math.html"
  },
  "permissions": [],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7d08a918-0e9d-4143-ab50-120f05e070b9}"
    }
  }
}