MiniCal

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "MiniCal",
  "description": "A pop-up calendar for quick reference",
  "version": "0.01",
  "author": "Thomas Hammerlund",
  "icons": {
    "128": "images/icon128.png"
  },
  "action": {
    "default_icon": "images/icon128.png",
    "default_popup": "calendar.html"
  }
}