Apple Releases Safari Technology Preview 166 With Bug Fixes and Performance Improvements

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 Feature
‌Safari Technology Preview‌ release 166 includes bug fixes and performance improvements for Web Inspector, CSS, JavaScript, Popover, Media, MSE, Web API, and Accessibility.

The current ‌Safari Technology Preview‌ release is version 16.4 and is compatible with machines running macOS Ventura and macOS Monterey.

The ‌Safari Technology Preview‌ update is available through the Software Update mechanism in System Preferences or System Settings to anyone who has downloaded the browser. Full release notes for the update are available on the Safari Technology Preview website.

Apple's aim with ‌Safari Technology Preview‌ is to gather feedback from developers and users on its browser development process. ‌Safari Technology Preview‌ can run side-by-side with the existing Safari browser and while designed for developers, it does not require a developer account to download.

Popular Stories

iPhone 17 Pro 34ths Perspective

iPhone 17 Pro Launching Later This Year With These 10 New Features

Sunday March 23, 2025 10:00 am PDT by
While the iPhone 17 Pro and iPhone 17 Pro Max are not expected to launch until September, there are already plenty of rumors about the devices. Below, we recap key changes rumored for the iPhone 17 Pro models as of March 2025: Aluminum frame: iPhone 17 Pro models are rumored to have an aluminum frame, whereas the iPhone 15 Pro and iPhone 16 Pro models have a titanium frame, and the iPhone ...
iOS 18

iOS 18.4 Expected Next Week - Here Are the Release Notes

Friday March 28, 2025 2:01 pm PDT by
With the second release candidate of iOS 18.4 that Apple seeded out today, the company finally provided us with release notes that give a full rundown on what to expect. There's an Apple Vision Pro app, new Apple Intelligence features for notifications and additional language support, plus an Apple News Food feature for Apple News+ subscribers, and several updates that should improve the...
Magic Mouse Green

What to Expect From the Magic Mouse 3

Saturday March 29, 2025 10:15 am PDT by
Apple is reportedly working on a new Magic Mouse. Below, we recap what to expect. The two key rumors for the Magic Mouse 3 so far include a relocated charging port, along with a more ergonomic design. It was briefly rumored that the Magic Mouse 3 would also feature voice control, but that was misinterpreted information. Relocated Charging Port While the Magic Mouse switched from...
top stories 2025 03 29

Top Stories: WWDC 2025 Announced, iPhone 17 Pro and iOS 19 Rumors, and More

Saturday March 29, 2025 6:00 am PDT by
Apple's big developer event is a little over two months away, and rumors about what we can expect to see in Apple's next major operating system updates are becoming increasingly frequent. A public release of iOS 18.4 is also imminent with a number of updates and improvements, although we won't be getting the major Apple Intelligence Siri upgrades that had reportedly been planned for this...
Foldable iPhone 2023 Feature Homescreen

Six Things to Know About Apple's Upcoming Foldable iPhone

Friday March 28, 2025 3:54 pm PDT by
We've been hearing rumors about a foldable iPhone for almost a decade now, but it looks like we might finally see the device come to fruition in 2026. We're going to be waiting many more months for the foldable iPhone, but so far we're hearing good things. Apple wants to make it creaseless. It's taken Apple multiple years to design a foldable iPhone that it's satisfied with because Apple ...
iOS 19 visionOS UI Elements

Apple Codename Provides Clue About iOS 19's Rumored New Design

Sunday March 30, 2025 6:40 am PDT by
Multiple sources have claimed that iOS 19 will introduce a new design with more translucent buttons, menus, notification banners, and more, and there is now another clue that points towards this glass-like appearance. Bloomberg's Mark Gurman today said the new design project is codenamed "Solarium" internally. A solarium is a room with glass walls that allow in plenty of sunlight, so this...
maxresdefault

Apple Releases iOS 18.4 With Priority Notifications, Ambient Music, New Emoji and More

Monday March 31, 2025 10:03 am PDT by
Apple today released iOS 18.4 and iPadOS 18.4, the fourth major updates to the iOS 18 and iPadOS 18 operating system updates that came out last year. iOS 18.4 and iPadOS 18.4 come two months after Apple released iOS 18.3 and iPadOS 18.3. Subscribe to the MacRumors YouTube channel for more videos. The new software can be downloaded on eligible iPhones and iPads over-the-air by going to...
ipad pro 2024

Gurman: New iPad Pro and MacBook Pro Models With M5 Chips to Launch Later This Year

Sunday March 30, 2025 6:06 am PDT by
Apple's next-generation iPad Pro models with the M5 chip will "launch this year," according to Bloomberg's Mark Gurman. In his Power On newsletter today, Gurman said the new iPad Pro models have progressed to an "advanced testing" stage, and he expects mass production of the devices to begin in the second half of this year. If that timeframe is met, the new iPad Pro models could launch...

Top Rated Comments

soyazul Avatar
27 months ago
Please Apple improves the Youtube experience on Safari on Intel Macs. Currently, it is an awful experience.
Score: 3 Votes (Like | Disagree)
Realityck Avatar
27 months ago

I heard it’s going to be snappier!! ?
Safari has been for awhile. There is little improvement now with faster AS Soc’s, and GHz ISP. So could say other browsers need to be as Snappy. :cool:
Score: 2 Votes (Like | Disagree)
steve333 Avatar
27 months ago
Now on Yahoo Mail there is no option anymore in the Spam folder to add a sender to the blocked list, while it is still available while using firefox
Safari has turned into a real dumpster fire
Score: 1 Votes (Like | Disagree)
maxdefcon Avatar
27 months ago

Now on Yahoo Mail there is no option anymore in the Spam folder to add a sender to the blocked list, while it is still available while using firefox
Safari has turned into a real dumpster fire
Then use Firefox... problem solved! :)
Score: 1 Votes (Like | Disagree)
AUGUSTU5 Avatar
27 months ago

Please Apple improves the Youtube experience on Safari on Intel Macs. Currently, it is an awful experience.
Even on an M1Pro the Youtube experience is like dog crap. Ok, maybe not sooooo bad, but sometimes extremely slow and hourly freezes that affect all tabs haunt me. - Chrome is so very much faster and quicker on loading web content. It just needs the second more on every request in safari, but because of the Passkey limitations, Chrome is just not a daily driver option for me. - add. many features in Safari are great and make it awesome to use, but the performance is just "slow" in real world usage.
Score: 1 Votes (Like | Disagree)
DeLaSoul Avatar
27 months ago
Where did AV1 codec support go? It was in there, now it’s pulled?
Score: 1 Votes (Like | Disagree)