Examine source code of Hextent

{
  "name": "Hextent",
  "version": "3.0",
  "description": "A wonderful new colour with every new tab. Make your day full of colour with Hextent",
  "manifest_version": 2,
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "Hextent.png",
    "48": "Hextent.png",
    "128": "Hextent.png"
  }
}