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

Apple Logo Gradient 16x9 1

Apple Just Made an Extremely Rare Product Announcement

Thursday August 27, 2026 7:58 am PDT by
The new Mac mini and Mac Studio models unveiled by Apple this week are the company's first new Macs announced in August since 2020. It is extremely rare for Apple to announce new products of any kind in August, excluding smaller things like new color options and accessories. As mentioned, Apple's last notable August product announcement was in 2020, when it updated the 27-inch iMac and a...
Apple Surprise Shine

Apple Event: Six New Products to Expect on September 9

Thursday August 27, 2026 8:00 am PDT by
Apple has announced that it will be holding an event on Wednesday, September 9 at 10 a.m. Pacific Time, with the company widely expected to unveil the iPhone 18 Pro, iPhone 18 Pro Max, its first-ever foldable iPhone, and more. Other products expected to be announced at the event include an Apple Watch Series 12 with a ceramic case option, an Apple Watch Ultra 4, AirPods 5 with and without...
iPhone 18 Pro Dark Cherry Feature

iPhone 18 Pro Pre-Orders May Start at an Unusual Time

Friday August 28, 2026 8:17 am PDT by
Pre-orders of Apple's iPhone 18 Pro may not open until Saturday, September 12, a day later than the company's usual schedule, according to a new report. Apple is set to hold its annual iPhone event on Wednesday, September 9, where the iPhone 18 Pro models, its first-ever foldable iPhone, and the Apple Watch Series 12 and Ultra 4 are all expected to be announced. Under Apple's typical...

Top Rated Comments

72 months ago
Snappier? Snappier.
Score: 3 Votes (Like | Disagree)
72 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
72 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
72 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
72 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
72 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)