# Service Worker Detector

> This extension detects if a website registers a Service Worker by reading the navigator.serviceWorker.controller property. It also parses the Web App Manifest.

Canonical page: [https://chrome-stats.com/d/service-worker-detector](https://chrome-stats.com/d/service-worker-detector)

## Overview

- **ID:** `service-worker-detector`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Removed
- **Publisher:** Thomas Steiner
- **Daily users:** 136
- **Weekly downloads:** 3
- **Rating:** 4.86 / 5 (7 ratings)
- **Version:** 2.4.0
- **Last updated:** 2020-11-03
- **First published:** 2017-04-21
- **Size:** 202 KB
- **Data as of:** 2025-05-11
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/service-worker-detector/)
- **Website:** [https://github.com/google/service-worker-detector/issues](https://github.com/google/service-worker-detector/issues)

## Description

The Service Worker Detector Chrome extension enables users to identify if a website registers a Service Worker by inspecting the navigator.serviceWorker.controller property. It also parses the Web App Manifest associated with the site. This lightweight and efficient tool is perfect for developers and testers working on progressive web apps (PWAs) or those analyzing site capabilities related to offline availability and caching strategies. With a simple interface, it facilitates rapid detection and manifest analysis without needing to dive deep into developer tools.

## Permissions and access

### Permissions

- `activeTab`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension is not longer available in the store

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/service-worker-detector)