Apple Releases Safari Technology Preview 128 With Bug Fixes and Performance Improvements Wednesday July 21, 2021 4:36 pm PDT by Juli Clover Apple today released a new update for Safari Technology Preview, the experimental browser Apple first introduced in March 2016. Apple designed the Safari Technology Preview to test features that may be introduced into future release versions of Safari. Safari Technology Preview release 128 includes bug fixes and performance improvements for Web Inspector, CSS, JavaScript, Live Text, Media, Performance API, and Web API. The current Safari Technology Preview release is built on the new Safari 15 update included in macOS Monterey, and as such, it includes several Safari 15 features. There's a new streamlined tab bar with support for Tab Groups to organize tabs, along with improved support for Safari Web Extensions.