Examine source code of Timezone Finder

{
  "manifest_version": 2,
  "name": "Timezone Finder",
  "version": "1.0.1",
  "description": "This is a simple extension that displays your current time zone",
  "author": "Aman Thukral",
  "icons": {
    "128": "icons8-clock-128.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons8-clock-128.png",
    "default_title": "Timezone finder"
  },
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "main.js"
    ]
  }
}