New Safari Technology Preview is focused on bug fixes.
Note: Tab Groups do not sync in this release.
Safari Technology Preview Release Notes
Download: Downloads for Safari
Release Notes: Safari Technology Preview Release Notes
Reference: Apple Releases Safari Technology Preview 137 With Bug Fixes and Performance Improvements
Recommendations
Developer:
Try new features of Safari Technology Preview.QA engineer:
Try web resources on Safari Technology Preview for regressions.PM/DM:
Business as usual.