Safari Technology Preview Release 126 is now available for download for macOS Big Sur and betas of macOS Monterey. If you already have Safari Technology Preview installed, you can update in the Software Update pane of System Preferences on macOS.
Many of the new Safari 15 features are now available in Safari Technology Preview 126:
Streamlined tab bar. Use Tab Groups to save and organize your tabs. Experience the new design. Test your site. Experiment with theme-color.
Live Text. Select and interact with text in images on the web in macOS Monterey betas on M1 Macs.
Improved Safari Web Extensions. Try out the support for
declarativeNetRequest, which expanded to 150K content blocking rules and non-persistent background pages for improved performance.
Quick Notes. Add links and Safari highlights to remember important information or ideas on the web in macOS Monterey betas.
WebGL 2. Try out the improved 3D graphics performance of WebGL running on top of Metal via ANGLE.
If you see bugs or unexpected behavior with the interface of Safari Technology Preview, please file Feedback in Apple’s Feedback Assistant. If you come across an implementation bug in web technology, or have a request, please file a ticket at bugs.webkit.org.
UPDATE: If you downloaded an earlier version of Safari Technology Preview 126, you may need to reboot.