Examine source code of Nepali Patro (Calendar)

{
  "manifest_version": 2,
  "name": "Nepali Patro",
  "version": "1.1",
  "description": "Nepali Patro using HamroPatro widget",
  "homepage_url": "https://github.com/sanghaarsha/NepaliPatroChrome",
  "icons": {
    "48": "./hamropatro.png"
  },
  "browser_action": {
    "default_icon": "./hamropatro.png",
    "default_title": "Nepali Patro",
    "default_popup": "./patro.html"
  }
}