Examine source code of Cats

{
  "name": "__MSG_appName__",
  "short_name": "__MSG_appShortName__",
  "description": "__MSG_appDescription__",
  "version": "1.0.1",
  "manifest_version": 2,
  "default_locale": "en",
  "icons": {
    "16": "images/icon-16.png",
    "24": "images/icon-24.png",
    "32": "images/icon-32.png",
    "64": "images/icon-64.png",
    "128": "images/icon-128.png"
  },
  "background": {
    "scripts": [
      "bg.js"
    ],
    "persistent": false
  },
  "permissions": [],
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  }
}