# WebTransport Inspector

> DevTools extension for inspecting WebTransport connections and MoQT protocol traffic

Canonical page: [https://chrome-stats.com/d/webtransport-inspector](https://chrome-stats.com/d/webtransport-inspector)

## Overview

- **ID:** `webtransport-inspector`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** moqtap
- **Category:** web-development
- **Daily users:** 1
- **Weekly downloads:** 1
- **Version:** 0.4.0
- **Last updated:** 2026-09-03
- **First published:** 2026-03-28
- **Size:** 208 KB
- **Data as of:** 2026-09-09
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/webtransport-inspector/)

## Description

Inspect WebTransport connections and MoQT protocol traffic right from Chrome DevTools.

moqtap adds a new panel to DevTools that gives you full visibility into WebTransport sessions — whether you're debugging a media pipeline or working on MoQT protocol implementations.

What it does:
<ul><li>Captures all WebTransport connections on a page, including those created inside Web Workers (essential for WebCodecs and MediaSession workflows)</li><li>Auto-detects the MoQT protocol and draft version directly from wire bytes — no configuration needed</li><li>Decodes MoQT control messages with full field display, so you can see subscribe requests, track info, and errors as they happen</li><li>Tracks active subscriptions with namespace and track name resolution</li><li>Shows live bitrate for each session, so you can monitor throughput at a glance</li><li>Includes a stream data viewer with hex and JSON modes for inspecting raw payloads</li><li>Detects content types automatically — fMP4/CMAF video segments, JSON control data, and raw binary</li><li>Adds filtering and grouping tools for tracks and streams, including namespace grouping, active-only view, and TX/RX direction filters</li><li>Lets you pause stream payload recording without losing control messages or track lifecycle visibility</li><li>Captures stack traces for outgoing control messages and unidirectional stream creation, with clickable source links in DevTools</li><li>Lets you export and import .moqtrace files to share debug sessions with your team</li></ul>
Works with:
<ul><li>MoQT drafts 07 through 19 (auto-detected)</li><li>Plain WebTransport connections (non-MoQT) are displayed gracefully</li><li>WebTransport in Web Workers and SharedWorkers</li><li>High-throughput video streaming sessions (tested at 40+ Mbps)</li></ul>
Built for developers working with WebTransport and Media over QUIC Transport. Lightweight, non-intrusive, and designed to stay out of your way on sites that don't use WebTransport.

Open source: <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/2a67602eef57eb193390149615c2f12db6f1573bd10905204612099c80a91960/https%3A//github.com/moqtap/extension" rel="nofollow">https://github.com/moqtap/extension</a>

## Rankings

- #106,461 — Overall
- #18 — transpose

## Permissions and access

### Permissions

- `storage`

### 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 was recently updated in the past month. New updates may not be stable or safe.

> 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/webtransport-inspector)