Examine source code of Chari-Tab

{
  "name": "Chari-Tab",
  "description": "Override the new tab page with newtab.chari-tab.com",
  "version": "1.2",
  "icons": {
    "128": "charicon.png"
  },
  "default_icon": "charicon.png",
  "chrome_url_overrides": {
    "newtab": "newtab_override.html"
  },
  "manifest_version": 2
}