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v4.5.0

MCP-UI-Org/mcp-uiv4.5.0Jun 9, 2026by alyssaxuu

AI Summary

This major update introduces background recording capabilities using the Offscreen API and replaces the legacy editor with a WebCodecs-based implementation for better performance.

Key Highlights

  • Recordings now run in the background using the offscreen API instead of a pinned tab.
  • The editor is lighter and faster now that it runs entirely on WebCodecs.
  • The ffmpeg fallback has been removed.

New Features

  • Background recording using Offscreen API
  • WebCodecs-based editor

Full Release Notes

- Recordings now run in the background using the offscreen API instead of a pinned tab, so they keep going even if the tab you started from gets frozen or discarded.
- The editor is lighter and faster now that it runs entirely on WebCodecs, with the ffmpeg fallback removed.