Firefox 138 Beta Released with Tab Enhancements and Autofill Improvements
Mozilla has released Firefox 138 to the public beta channel, continuing its focus on usability improvements and modern web standards. This release introduces new Contrast Control settings, enhanced tab management features, and several platform-specific tweaks that refine the browsing experience.
New Contrast Control for Better Accessibility
One of the headline features in Firefox 138 is the revamped Contrast Control system. This replaces the older color settings and gives users more control over how websites appear, especially for those who need higher readability. While the feature is disabled by default, users can toggle it on via browser settings, choosing between:
Automatic (syncs with system theme)
Custom (user-defined contrast levels)
This makes browsing more accessible for users with visual sensitivities or those who prefer consistent color schemes.
Tab Group Features Continue to Evolve
Tab groups, introduced in Firefox 137, are now being expanded in this beta release. Firefox 138 adds right-click options like:
Add Tabs to New Tab Group
Remove from Group
These updates aim to make tab organization more intuitive. Additionally, Linux and macOS users can now copy links from background tabs using the tabstrip context menu — a small but helpful productivity boost.
Autofill, Bug Reporting, and Platform Upgrades
Firefox 138 also improves autofill for addresses and credit cards, especially on sites with dynamic forms. Mozilla has also introduced a “Report broken site” option in the main menu, making it easier for users to notify Mozilla of page rendering or compatibility issues.
Other platform-specific enhancements include:
Windows 11: Acrylic-style pop-up menus for a more native look
Android:
Support for TLS client authentication certificates
Ability to share downloaded files or URLs
Desktop mode enabled by default on tablets
Developer-Focused Changes
Web developers also benefit from several updates:
Support for
error.captureStackTraceNew
Error.isErrormethodImport Attributes support for module imports
These changes improve debugging, compatibility, and flexibility in modern JavaScript development.
Try It Now
Firefox 138 is a smaller update, but it fine-tunes multiple areas to improve accessibility, usability, and developer experience. If you want to try the beta, head over to the official Firefox Beta page and download it today.
Click below and ‘share’ this article!