Apple releases new Safari Technology Preview. This update is mostly related to bug fixes and performance optimizations.
Note: On macOS Big Sur, this release requires enabling GPU Process: Media option from Experimental Features under the Develop menu to address issues with streaming services.
Safari Technology Preview Release Notes
Apple Developer: Downloads for Safari
Release Notes: Safari Technology Preview Release Notes
Reference: Apple Releases Safari Technology Preview 129 With Bug Fixes and Performance Improvements
Recommendations
Developer:
Check new Technology Preview for compatibility issues.QA engineer:
Check new Technology Preview for compatibility issues.PM/DM:
Business as usual.