Clock

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Clock",
  "version": "1.0",
  "description": "A simple clock in the toolbar.",
  "browser_action": {
    "default_title": "Clock",
    "default_popup": "html/popup.html"
  },
  "background": {
    "scripts": [
      "js/base.js",
      "js/background.js"
    ],
    "persistent": true
  },
  "icons": {
    "16": "images/16.png",
    "32": "images/32.png",
    "48": "images/48.png",
    "128": "images/128.png"
  },
  "manifest_version": 2
}