Examine source code of LinkedIn Local Time Finder

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "LinkedIn Local Time Finder",
  "description": "Reads a LinkedIn profile's location, maps it to a timezone, and shows the person's local time on their profile page.",
  "version": "1.0.4",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "service_worker": "background.js"
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "LinkedIn Local Time Finder"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.linkedin.com/*"
      ],
      "js": [
        "tz-enhanced.js",
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://linkedinlocaltimefinder.com/success*"
      ],
      "js": [
        "success-listener.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "host_permissions": [
    "https://linkedinlocaltimefinder.com/*"
  ],
  "permissions": [
    "storage",
    "activeTab"
  ],
  "externally_connectable": {
    "matches": [
      "https://linkedinlocaltimefinder.com/*"
    ]
  },
  "web_accessible_resources": [
    {
      "resources": [
        "tz-lookup.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}