Examine source code of Attendance Assistant

{
  "manifest_version": 2,
  "name": "Attendance Assistant",
  "version": "1.3",
  "description": "Reminds you at 5 PM to fill your NewersWorld timesheet and helps you do it.",
  "permissions": [
    "alarms",
    "notifications",
    "storage",
    "tabs",
    "activeTab",
    "https://newersworld.tothenew.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon48.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://newersworld.tothenew.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icon48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "attendance-assistant@example.com"
    }
  }
}