Apple Releases Safari Technology Preview 120 With Bug Fixes and Performance Improvements - MacRumorsOpen MenuShow RoundupsShow Forums menuVisit ForumsOpen Sidebar
Skip to Content

Apple Releases Safari Technology Preview 120 With Bug Fixes and Performance Improvements

safaripreviewiconApple 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 120 includes bug fixes and performance improvements for Web Inspector, Scrolling, CSS, JavaScript, Web API, Media, WebRTC, Web Audio, Accessibility, Payment Request, Speech Recognition, and Private Click Measurement.

The current ‌Safari Technology Preview‌ release is the built on the new Safari 14 update included in macOS Big Sur with support for Safari Web Extensions imported from other browsers, tab previews, password breach notifications, web authentication with Touch ID, and more.

The new ‌Safari Technology Preview‌ update is available for both macOS Catalina and macOS Big Sur, the newest version of the Mac operating system.

The ‌Safari Technology Preview‌ update is available through the Software Update mechanism in System Preferences 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

Safari Technology Preview Updated Feature 1

Apple Releases Safari Technology Preview 256 With Bug Fixes and Performance Improvements

Wednesday November 4, 2026 4:21 pm PST by
Apple today released a new update for Safari Technology Preview, the experimental browser that was first introduced in March 2016. Apple designed Safari Technology Preview to allow users to test features that are planned for future release versions of the Safari browser. Safari Technology Preview 256 includes fixes and updates for Accessibility, Animations, CSS, Editing, Forms, HTML,...
iOS 28 AI

Apple Taking New Approach to Developing iOS 28 and macOS 28

Sunday November 8, 2026 7:42 am PST by
Apple has made a change to its development process for iOS 28, macOS 28, and corresponding software updates, according to Bloomberg's Mark Gurman. In his Power On newsletter today, he said Apple separates development of each year's new operating systems into three major stages. Typically, he said each stage consists of four weeks of coding followed by a four-week "convergence" period where...
duo aquarium

More Fun iPhone Duo Apps: 30 New Picks to Try

Friday November 6, 2026 3:27 pm PST by
When the iPhone Duo launched, we shared a list of some of the fun apps developers created for the new form factor. Two weeks out, developers are continuing to come up with fresh ideas, so we thought we'd share some of our favorites. Games Marbles Unhinged ($2.99) - Marbles Unhinged is a marble maze designed for the Duo. When you fold it, the floor turns into a ramp. If you stand the top...

Top Rated Comments

75 months ago
Snappier? Snappier.
Score: 3 Votes (Like | Disagree)
75 months ago

Trying to switch from Chrome to Safari. Realized Gmail gets reloaded all the time due to "significant memory" messages. Tried Safari Technology Preview (STP) -- seems to happen less, but is still happening.
@TabascoMuffin seems from your cross-out, are you saying it's still happening on the newest STP?

Another question, how is everyone dealing with website notifications, like the Safari Push Notifications that MacRumors for example offers? I just realized when I click on one, even though I have STP set up as the default browser, the system insists of opening up Safari (not-STP) and loading the page in that. Although just now it opened Safari and actually loaded the page in both Safari and STP.
When you load a page with more than 2GB RAM on STP 119 or 14.0.3 on Big Sur, it becomes unusable, very laggy, and the message "safari using significant memory" appears.
Tested on MBP16 and iMac 2020.

However, on STP 120 I was able to load the same page to 2.6GB RAM and then got the "safari using significant memory" message. But this time, the page wasn't laggy and I could still scroll down and load more pictures for example.

It's not happening on Chrome nor Firefox.
Score: 2 Votes (Like | Disagree)
Blowback Avatar
75 months ago

Two weird issues with this release:
[LIST=1]
* Can only sporadically get Command-N to open a new window. Quitting and restarting helps, but then it fails again.
* Pinned tabs don't "stick." I create them in one window, and they don't appear in the next, or when I restart.

Make sure to alert Apple....
Score: 1 Votes (Like | Disagree)
Blowback Avatar
75 months ago

ANYONE❓⁉️❓
For Q #1: Yes...if I read you correctly; when I open a website in either it ONLY opens in that version of Safari.
For Q #2: Just received an update yesterday. The updates arrive just as per other Apple applications. Check your Prefs/updates .
Hope this helps.
Score: 1 Votes (Like | Disagree)
k.alexander Avatar
75 months ago

❓❓❓Just to confirm: when you receive a website apple/safari push notification, it opens in just STP? And does it also open in regular Safari?

❓❓❓How are you updating to each new version of STP? Do you go and manually download and install on top of the current version, or is the update coming through the AppStore?
ANYONE❓⁉️❓
Score: 1 Votes (Like | Disagree)
Blowback Avatar
75 months ago

I had some issues a few years back and went and downloaded the preview to see if it would fix them. Never used it much since.

Anyone who is not a developer using the Preview?
Me. No real issues. TIP: great for doing crossword puzzles in 'Safari' and checking spelling/ answers in STR!
Score: 1 Votes (Like | Disagree)
Latest Stories
Apple Releases macOS Golden Gate 27.2.1
Apple Releases macOS Golden Gate 27.2.1
52 minutes ago
Apple Releases iOS 27.2.1 With Bug Fixes
Apple Releases iOS 27.2.1 With Bug Fixes
56 minutes ago
Apple Releases watchOS 27.2.1 and visionOS 27.2.1 With Security Fixes
Apple Releases watchOS 27.2.1 and visionOS 27.2.1 With Security Fixes
58 minutes ago
Apple Watch Ultra 4 Gets $99 Amazon Discounts, Starting at $699.99
Apple Watch Ultra 4 Gets $99 Amazon Discounts, Starting at $699.99
1 hour ago
Apple Pay Ad Features Martial Arts Convenience Store Food Fight
Apple Pay Ad Features Martial Arts Convenience Store Food Fight
1 hour ago
Apple Continues to Say Some AI Features Will Have Fees for Extra Usage
Apple Continues to Say Some AI Features Will Have Fees for Extra Usage
1 hour ago
Apple Announces Türkiye Expansion Plans as Tim Cook Visits
Apple Announces Türkiye Expansion Plans as Tim Cook Visits
3 hours ago
Singapore Saved Apple $2.7 Billion in Taxes This Year
Singapore Saved Apple $2.7 Billion in Taxes This Year
3 hours ago
Apple Music's 2026 Artist of the Year is Olivia Dean
Apple Music's 2026 Artist of the Year is Olivia Dean
3 hours ago
This Could Be Your Last Chance to Pre-Order the HomeView at a Discount
This Could Be Your Last Chance to Pre-Order the HomeView at a Discount
3 hours ago
Some HomePod Mini 2 Buyers Returning Units Over Mac Speaker Issues
Some HomePod Mini 2 Buyers Returning Units Over Mac Speaker Issues
4 hours ago
MacBook Pro With PROLED XDR Display: Details You Might Have Missed
MacBook Pro With PROLED XDR Display: Details You Might Have Missed
4 hours ago
Satechi Offers MacRumors Readers 30% Off Select Accessories in Early Black Friday Sale
Satechi Offers MacRumors Readers 30% Off Select Accessories in Early Black Friday Sale
4 hours ago
Leaker Envisions a Shorter iPhone With a New iOS Layout
Leaker Envisions a Shorter iPhone With a New iOS Layout
5 hours ago
Apple to Give You More Control Over When Your Mac Passwords Lock
Apple to Give You More Control Over When Your Mac Passwords Lock
5 hours ago
Siri Is Getting a Better Memory
Siri Is Getting a Better Memory
6 hours ago
iPhone 18e Could Feature Bigger Display and Battery
iPhone 18e Could Feature Bigger Display and Battery
6 hours ago
Apple's Siri Boss May Leave - Here's Who Could Take Over
Apple's Siri Boss May Leave - Here's Who Could Take Over
7 hours ago
Apple Launching Two More New Products This Friday
Apple Launching Two More New Products This Friday
7 hours ago
Apple Store Subscription Sign-Up Controversy Exposed
Apple Store Subscription Sign-Up Controversy Exposed
16 hours ago
Siri AI Rumored to Become 'More Like an Agent' as Early as Next Year
Siri AI Rumored to Become 'More Like an Agent' as Early as Next Year
1 day ago
Apple Taking New Approach to Developing iOS 28 and macOS 28
Apple Taking New Approach to Developing iOS 28 and macOS 28
1 day ago
Early Apple Black Friday Deals on Apple Watch, MacBook Air, and More
Early Apple Black Friday Deals on Apple Watch, MacBook Air, and More
2 days ago
'Backglow' Lets You Customize New MacBook Pro's Glowing Apple Logo
'Backglow' Lets You Customize New MacBook Pro's Glowing Apple Logo
2 days ago
Top Stories: Apple Product Launches, iOS 27.3 Beta, and More
Top Stories: Apple Product Launches, iOS 27.3 Beta, and More
2 days ago
More Fun iPhone Duo Apps: 30 New Picks to Try
More Fun iPhone Duo Apps: 30 New Picks to Try
3 days ago
Hands-On With Apple's New OLED Touchscreen MacBook Pro
Hands-On With Apple's New OLED Touchscreen MacBook Pro
3 days ago
Apple Store With All-New Design Opening Soon in Southern California
Apple Store With All-New Design Opening Soon in Southern California
3 days ago
Control the Glowing Apple Logo on Your New MacBook Pro
Control the Glowing Apple Logo on Your New MacBook Pro
3 days ago
Apple Shares New 'Apple Card: Apply and Use in Minutes' Ad
Apple Shares New 'Apple Card: Apply and Use in Minutes' Ad
3 days ago