PostMessage Tracker — live postMessage inspection in Chrome DevTools

PostMessage Tracker is a Chrome extension that adds a DevTools panel for observing messages exchanged between a page and its frames. It records sent and received postMessage events in real time and displays their origin, timestamp, metadata, and payload.

Capabilities: • filter events by origin, type, or payload content; • pretty-print JSON payloads; • pause, resume, and clear the event log; • block selected messages based on origin or data.

The extension is useful for reconstructing cross-window flows and selecting messages for manual checks of event.origin, sensitive data exposure, or unsafe payload handling. The store listing does not claim listener source inspection, message editing and replay, automated origin-bypass testing, or PoC generation.

Tool: https://chromewebstore.google.com/detail/postmessage-tracker/alkcnimeadmepbknnpliacknonaihgai