extension ExtPose

Service Worker Detector

CRX id


Description from extension meta

This extension detects if a website registers a Service Worker.

Image from store Service Worker Detector
Description from store 👷 This extension detects if a website registers a Service Worker [1] by reading the navigator.serviceWorker.controller property [2]. It also parses the Web App Manifest and displays the information in an accessible way. Find the source code of the extension on GitHub [3]. 🤔 Why would you want this? If you aren’t into Web development, most probably you wouldn’t. However, if you are into Web development, the extension helps you identify (unexpected) Service Worker registrations in the wild and lets you analyze their code and learn from them. 💡 Why would you use this extension and not just the amazing Chrome Developer Tools? The answer is that the extension proactively detects Service Workers before you even have to open the Developer Tools (which you probably eventually will end up doing anyway). -- [1] https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorker [2] https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerContainer/controller [3] https://github.com/google/service-worker-detector

Latest reviews

  • (2022-04-29) Vitaliy Romanyuk: Doesn't work (lazy dumb on icon still sleeping when workers are loads and works) on latest Cent (Chromium 86.0.4240.198)
  • (2018-01-18) Julius Schröder: Works perfectly!
  • (2017-02-28) Marco Pöhler: easy access to service workers

Latest issues

  • (2021-08-01, v:2.4.0) Stijn Hommes: Block service workers
    Can you please build in an option to disallow service worker registration on all except whitelisted domains?


1,000 history
4.2 (5 votes)
Last update / version
2020-11-29 / 2.4.0
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