Minimal New Page

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Minimal New Page",
  "description": "Override the new tab page with a minimal clock",
  "version": "0.2",
  "incognito": "split",
  "chrome_url_overrides": {
    "newtab": "blank.html"
  },
  "background": {
    "scripts": [
      "assets/script.js"
    ],
    "styles": [
      "assets/styles.css"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "assets/icon.png"
  },
  "icons": {
    "16": "assets/icon16.png",
    "48": "assets/icon48.png",
    "128": "assets/icon128.png"
  },
  "content_security_policy": "script-src 'self'; default-src 'self'",
  "manifest_version": 2
}