March 7, 2026

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Firefox 146.0.1 Released with Critical Fixes for Font Rendering and Security Issues

Firefox 146.0.1 Released with Critical Fixes for Font Rendering and Security Issues



Firefox 146.0.1 Released with Critical Fixes for Font Rendering and Security Issues

Mozilla released Firefox 146.0.1 for desktop on December 18, 2024, delivering a minor update that addresses several important bugs and security vulnerabilities affecting the popular web browser.

Key Issues Resolved

The latest version tackles multiple problems that have been impacting user experience and browser stability:

Font Rendering Problems: One of the most notable fixes addresses broken font rendering on popular websites caused by Firefox’s fingerprinting protection feature. Fingerprinting is a tracking technique that websites use to identify users based on their browser characteristics, and Firefox’s anti-fingerprinting measures inadvertently disrupted how fonts were displayed on some sites.

Crash Fixes: Mozilla has resolved several crash-related issues affecting different aspects of the browser, including crashes related to browsing, graphics, and accessibility features. The update also fixes crashes associated with media playback and the shutdown of the GMP (Gecko Media Plugin) process.

Profile Management: The browser now properly handles desktop profile shortcuts when users modify copied profile settings, preventing unintended deletion of these shortcuts.

Vertical Tabs Enhancement: For users utilizing vertical tabs, Firefox 146.0.1 improves sidebar text contrast with certain themes, making the interface more readable.

Backup Restoration: When restoring from a backup, success messages now appear in a new tab rather than in restored tabs, preventing situations where the message could be cancelled by restored content.

Thorium Browser: Uses up to 87% less RAM than Chrome

 


Security Updates

The release includes two security fixes, both rated “High” severity according to Mozilla’s four-tier classification system. These vulnerabilities could potentially allow arbitrary code execution, making it crucial for users to update promptly.

While specific technical details of the security fixes have not been disclosed to prevent exploitation, the “High” severity rating indicates these are serious issues that users should not ignore.

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Availability

Firefox 146.0.1 is available as a free, donation-supported browser for Windows, macOS, and Linux platforms. Users can download the update directly from Mozilla’s website, with Windows 10 and 11 users also able to access it through the Mado no Mori Library.

The browser typically updates automatically, but users can manually check for updates by navigating to the menu and selecting “Help” > “About Firefox.” Given the security implications of this release, users who have disabled automatic updates should prioritize installing this version as soon as possible.

This rapid follow-up to Firefox 146.0 demonstrates Mozilla’s commitment to quickly addressing issues that affect user experience and security, particularly when features designed to protect privacy inadvertently cause functionality problems.

Firefox 146.0.1 Released with Critical Fixes for Font Rendering and Security Issues

Firefox 146.0.1 Released with Critical Fixes for Font Rendering and Security Issues


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