Examine source code of Daily Quote i

{
  "manifest_version": 2,
  "name": "Daily Quote",
  "version": "1.0",
  "description": "Show an inspirational quote on every new tab.",
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{54513aad-e8d6-481a-a869-84b7d97ca82f}"
    }
  }
}