Examine source code of Monthly Prayer Timetable

{
  "minimum_chrome_version": "38",
  "sidebar_action": {
    "default_icon": "assets/icon_128.png",
    "default_title": "Prayers Timetable",
    "default_panel": "data/index.html"
  },
  "name": "Monthly Prayers Timetable",
  "short_name": "Calculating Muslim prayers time",
  "icons": {
    "16": "assets/icon_16.png",
    "128": "assets/icon_128.png"
  },
  "applications": {
    "gecko": {
      "id": "@monthlyprayer",
      "strict_min_version": "54.0a1"
    }
  },
  "homepage_url": "http://mediamaster.eu/contatti",
  "version": "1.2.6resigned1",
  "manifest_version": 2,
  "description": "Islamic Monthly Prayers Timetable with HTML5 Geolocation"
}