Examine source code of JossWork

{
  "applications": {
    "gecko": {
      "id": "jitu@josswork.com",
      "strict_min_version": "42.0"
    }
  },
  "name": "JossWork",
  "short_name": "JossWork",
  "version": "1.5.10resigned1",
  "manifest_version": 2,
  "description": "A simple extension for Hasslefree automated work attendance system. Existing internet connection is enough to get it done, no hardware setup required. Automatic attendance count when team members are connected to wifi with browser.",
  "homepage_url": "https://www.josswork.com",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "default_locale": "en",
  "background": {
    "scripts": [
      "src/bg/background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_title": "Click here to Check-in",
    "default_popup": "popup.html",
    "default_icon": "icons/icon.png"
  },
  "options_ui": {
    "page": "src/options.html"
  },
  "permissions": [
    "idle",
    "storage",
    "geolocation",
    "notifications",
    "https://app.josswork.com/"
  ]
}