Following the promotion of Firefox 140 to the stable ESR channel, Mozilla has moved Firefox 141 to the beta channel for public testing. While this update appears relatively minor, it includes useful performance improvements and UI tweaks, particularly for Linux users and developers.

Mozilla plans to officially release Firefox 141 on July 22, 2025, alongside Firefox 140.1 ESR and Firefox 128.13 ESR.

Performance Gains for Linux Users

One of the key highlights in Firefox 141 is its focus on improving memory usage on Linux systems. The browser is now better optimized, leading to smoother performance and reduced memory overhead for Linux users.

In addition, users will no longer be forced to restart Firefox after applying updates via a package manager. This change results in a smoother update experience with fewer disruptions.

Tab Pinning Made Easier

A small but thoughtful update has been introduced to tab management. Firefox 141 now allows users to:

• Drag a tab to the pinned tabs tray to pin it

• Drag a pinned tab out to unpin it

This intuitive gesture makes managing tabs quicker and more user-friendly, especially for multitaskers.

Visual Improvements to New Tab Customization

Another visible change appears on the New Tab page. The old gear icon used to customize the layout has been replaced with a new “Customize” button. It comes with a fade-in and fade-out animation, offering a sleeker and more modern visual feel.

Web Development Updates

Firefox 141 delivers a few notable updates for web developers:

• CHIPS (Cookies Having Independent Partitioned State) is now re-enabled

• Support for the closedby attribute and the related closedBy property

• The browser will now clear the bfcache (backwards-forwards cache) when it receives a Clear-Site-Data: "cache" response header

• Support for webkitdirectory attribute and HTMLInputElement.webkitdirectory property on Firefox for Android

These updates enhance browser behavior consistency across platforms and add flexibility for developers targeting modern web standards.

Add-On Development Enhancements

For add-on developers, Firefox 141 adds support for the i18n.getPreferredSystemLanguages method. This API allows extensions to:

• Retrieve the system’s preferred locales

• Complement the existing i18n.getAcceptLanguages method, which fetches browser-defined languages

This helps developers create more localized and user-friendly extensions.

While Firefox 141 may not introduce sweeping changes, it offers meaningful improvements for Linux users, better tab management, UI refinements, and important developer features. It continues Mozilla’s steady pace of enhancing Firefox’s user and developer experience.

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