Browser extension for Chrome and Firefox for inspecting MoQT over WebTransport. Monitor connections, decode control messages, track subscriptions, inspect streams and datagrams, and detect media formats.

WebTransport Inspector is a browser extension for Chrome and Firefox that adds MoQT protocol inspection to your browser’s DevTools. Monitor WebTransport connections, decode MoQ control messages, track subscriptions, inspect streams and datagrams, and detect media formats — all without leaving the browser.

Key features

Chrome and Firefox support
DevTools panel integration
Real-time control message decoding with chunk reassembly
WebTransport connection monitoring (including iframes)
Track subscription tracking with namespace grouping and direction filters
Stream and datagram inspector with virtual scrolling and text filtering
ISO BMFF media detection (CMAF/LOC/fMP4) with box-level detail
CBOR and MessagePack payload detection
Hex viewer with inline object boundary banners and per-object navigation
Recording controls (pause/resume capture, clear stream data)
Trace export and import (.moqtrace format)