Examine source code of Time Tracker Glass

{
  "manifest_version": 2,
  "name": "Time Tracker Glass",
  "version": "1.0",
  "description": "Track your website usage time with beautiful dark glassmorphism UI",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "webNavigation",
    "webRequest",
    "<all_urls>",
    "alarms"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png"
    },
    "default_title": "Web Usage Tracker",
    "default_popup": "popup/dashboard.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3f58817c-8d11-4459-bf89-df66c7477631}"
    }
  }
}