Firefox Beta and Developer Edition
Release Notes

Added support for credit card autofill

WebVR has been enabled for Mac OS X users

Added Nepali (ne-NP) locale

Optimize page load by caching JavaScript internal representation

Improved page render speed for Windows users with Off-Main-Thread Painting

Security fixes to address the Meltdown and Spectre timing attacks

Fix a crash reporting issue that inadvertently sends background tab crash reports to Mozilla without user opt-in (bug 1427111)

User profiles created in Firefox 58 (and in future releases) are not supported in previous versions of Firefox. Users who downgrade to a previous version should create a new profile for that version. Learn about alternatives to downgrading on our support site.

On Windows and Linux, Firefox crashes occasionally on Intel Broadwell-U processors with old microcode. Windows users should ensure Windows Update is set to install updates. Linux users should ensure that the distribution package for Intel microcode is installed.