Examine source code of Custom New Tab Quotes

{
  "manifest_version": 2,
  "name": "Custom New Tab Quotes",
  "version": "1.0",
  "description": "Show a motivational quote on every new tab.",
  "permissions": [],
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{15599399-03b0-429c-9211-e0651803b40e}"
    }
  }
}