Examine source code of Google Homepage

{
  "manifest_version": 2,
  "name": "Google Homepage",
  "version": "2.3",
  "description": "The most efficient way to use your favourite search engine.",
  "icons": {
    "16": "icons/favicon/16.png",
    "24": "icons/favicon/24.png",
    "32": "icons/favicon/32.png",
    "64": "icons/favicon/64.png",
    "128": "icons/favicon/128.png",
    "256": "icons/favicon/256.png",
    "512": "icons/favicon/512.png"
  },
  "permissions": [
    "bookmarks",
    "search",
    "topSites",
    "tabs",
    "storage",
    "https://www.metaweather.com/*",
    "https://suggestqueries.google.com/*",
    "https://besticon-demo.herokuapp.com/*"
  ],
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  }
}