Examine source code of TimeBox

{
  "manifest_version": 2,
  "name": "TimeBox",
  "version": "1.0.0",
  "description": "TimeBox is a Chrome/Firefox extension aimed at helping remote teams by making it easier to see from where and when their co-worker's do their work during COVID-19 pandemic.",
  "author": "Anurag Pandey",
  "icons": {
    "128": "images/clock.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "images/clock.png",
    "default_title": "TimeBox"
  },
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "main.js"
    ]
  }
}