Until

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Until",
  "description": "A clean, simple new tab countdown extension to wait for exiciting dates.",
  "version": "1.3",
  "chrome_url_overrides": {
    "newtab": "until.html"
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  }
}