Examine source code of Flock

{
  "manifest_version": 2,
  "name": "Flock",
  "version": "1.0",
  "description": "A productivity focused new tab.",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "permissions": [
    "storage"
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "flock@itscosmo.live"
    }
  }
}