Firefox version 147.0 was released on January 13, 2026.
Notable changes include:
- Compliance with the Linux XDG Base Directory Specification (after 20 years...)
- Improved AMD GPU performance
- Expanded Apple Silicon WebGPU support.
I'll have to check it out on my M1 MacBook Air.
Release notes
https://www.firefox.com/en-US/firefox/147.0/releasenotes/?redirect_source=mozilla-org&utm_source=firefox-browser&utm_medium=firefox-desktop&utm_campaign=about-dialog
The following is a summary by Geminai.
Here's a summary of the key updates in Firefox version 147.0 (released on January 13, 2026).
Major Updates and New Features
Safe Browsing V5 Support: Enhanced security by transitioning from the previous Safe Browsing V4 protocol to the new V5 protocol.
Compliance with Linux XDG Base Directory Specification: After nearly 20 years, support has been added for the Freedesktop.org XDG Base Directory Specification, a long-standing request from Linux users.
Improved AMD GPU Performance: Enabled 'Zero-copy' playback for hardware decoding video, significantly improving video playback performance on systems using AMD GPUs.
Expanded Apple Silicon WebGPU Support: WebGPU support is now enabled by default on all macOS versions with Apple Silicon chips.
Introduction of Compression Dictionaries: Supports the IETF RFC 9842 standard, reducing data transfer volume and improving page loading speed in bandwidth-limited environments.
Official Introduction of Auto PiP (Picture-in-Picture): The feature that allows videos to continue playing even when switching tabs has been officially implemented. ( for activation)
Other Improvements
GNOME Rendering Optimization (Linux): Updated pixel grid matching functionality to improve rendering clarity in GNOME environments using fractional scaling.
Improved Windows Compatibility: Fixed an issue where tabs in maximized windows on certain monitors could not be clicked.
Enhanced Security for Android Firefox: Enabled 'Site Isolation' functionality at the same level as the desktop version, protecting against side-channel attacks such as Spectre.
Browser Compatibility: Adjusted the quality value of the header to match other browsers (such as Chrome), resolving server response error issues.
Updates for Web Developers
Navigation API Support: Added a new API that complements the existing History API, allowing for more granular control over browser navigation.
CSS Anchor Positioning: Introduced anchor positioning functionality, enabling relative combination of positions between elements.
Support for ES Modules within Service Workers: Improved compatibility for modern web app development.
New CSS Units: Implemented root font-relative units such as , , , and .
For more detailed technical information, please refer to the release notes provided in the link.
