Mozilla Firefox 83 comes with big JavaScript improvements


Mozilla has announced the release of Firefox 83. Unlike Firefox 82, which was a modest upgrade, Firefox 83 includes big improvements, including improvements to the SpiderMonkey JavaScript engine that increases page loading performance, page responsiveness, and reduces memory usage.

With Firefox 83, Mozilla decided to replace parts of its JavaScript engine. In addition to improving browser security and making it easier to maintain, the changes increase page load performance by 15%, page responsiveness by 12%, and reduce memory usage by 8%. You will not have to do anything to take advantage of these improvements as they are enabled by default in the update.

Another new feature is HTTPS-only mode. This is an optional feature that can be enabled in Firefox preferences. As you can see from the name, this mode will ensure that all your website connections are encrypted and secure, giving you peace of mind when connected to a public network. If a website does not support HTTPS, you will be greeted with a “Secure connection not available” message. You have the option of accessing the website using HTTP only, but the warning will notify you before continuing.

Other notable changes include pinch zoom support for Windows touchscreen devices and touchpads on Mac devices, directional arrows can be used to fast forward, rewind, and adjust volume in Picture-in mode -Picture, and AcroForm support has been added, allowing you to fill out, print and save PDF supported forms.

The company said this release is important for WebRender as the rollout spans Windows 7 and 8 as well as macOS 10.12 to 10.15. Regarding Mac devices, the company said Firefox 83 and above will run on Apple’s new Silicon processor using emulation under Apple’s Rosetta 2 that ships with Big Sur. In the future, the company will support the new processor natively.


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