Launched last October, Apple's redesigned MacBook Pro models with M1 Pro and M1 Max chips feature Liquid Retina XDR displays with ProMotion technology for adaptive refresh rates ranging from 24Hz to 120Hz.
When viewing a static webpage that doesn't require a high refresh rate, the MacBook Pro's display adopts the lower refresh rate to preserve battery life, but when gaming, scrolling, or doing other activities where a higher refresh rate will result in smoother content, the higher frame rates will kick in.
According to Mozilla's release notes, the latest Firefox 103 update brings improved performance on displays capable of refresh rates upwards of 120Hz, suggesting the 14-inch and 16-inch Macs with ProMotion stand to benefit.
As some readers will recall, soon after Apple launched 14-inch and 16-inch MacBook Pro models with Apple silicon last October, many users began reporting issues with stuttering, janky scrolling when browsing in Apple's Safari.
While some users reported noticing smoother Safari scrolling and performance on these Macs after upgrading to macOS Monterey 12.2, Apple has never officially confirmed that ProMotion is functional in its native browser for Mac. Therefore, anyone still unconvinced that they are seeing optimal refresh rates in Safari now at least has an alternative option to use a browser that should be capable of running ProMotion at full tilt.
In addition to the above, Firefox 103 also offers improved responsiveness on macOS during periods of high CPU load, which it achieves by switching to a modern lock API, according to the release notes.
Also new in this update is the ability to change the subtitles font size directly from within a Picture-in-Picture window, as well as support for subtitles on platforms including Funimation, Dailymotion, Tubi, Hotstar, and SonyLIV.
In other tweaks, required fields in PDFs are now highlighted, and there are a number of bugs and security vulnerabilities that have also been fixed. Firefox 103 for macOS is available now from the Mozilla website, where users can find a full list of changes.
Related Roundup: 14 & 16" MacBook Pro
Buyer's Guide: 14" & 16" MacBook Pro (Caution)
Related Forum: MacBook Pro
This article, "Firefox 103 Includes Performance Boost for Macs With 120Hz+ Displays" first appeared on MacRumors.com
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source https://www.macrumors.com/2022/07/27/firefox-103-update-promotion-displays/
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