simple clock

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "simple clock",
  "description": "Just a simple clock",
  "version": "1.0.1",
  "background": {
    "page": "background.html",
    "persistent": true
  },
  "browser_action": {
    "default_icon": "base.png"
  },
  "icons": {
    "128": "icons/icon_128.png"
  },
  "permissions": [
    "storage"
  ],
  "options_page": "options/main.html"
}