Calculator

manifest.json

{
  "update_url": "http://clients2.google.com/service/update2/crx",
  "name": "Calculator",
  "description": "Calculator by Manthra All Rights Reseverd",
  "version": "2.2",
  "manifest_version": 2,
  "icons": {
    "16": "16.png",
    "48": "48.png",
    "128": "128.png"
  },
  "browser_action": {
    "default_icon": "16.png",
    "default_popup": "popup.html",
    "default_title": "Calculator"
  }
}