Examine source code of Stoic Tabs

{
  "manifest_version": 2,
  "name": "Stoic Tabs",
  "version": "0.3",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "background": {
    "scripts": [
      "js/main.js"
    ]
  }
}