Examine source code of Peapix New Tab

{
  "manifest_version": 2,
  "name": "Peapix New Tab",
  "version": "2.1.1",
  "homepage_url": "https://peapix.com",
  "description": "A beautiful New Tab page. Customize your new tab background with Bing homepage images.",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": false,
    "open_in_tab": true
  },
  "permissions": [
    "storage",
    "alarms",
    "topSites",
    "https://peapix.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}