Firefox 149 Beta Arrives with Split View Mode and Major Performance Boosts

Mozilla has just pushed Firefox 149 to beta, delivering a wave of new features and under-the-hood improvements that promise to make the browsing experience faster, more stable, and more versatile. This latest beta milestone follows the recent Firefox 148 release, which introduced AI controls, and now Mozilla is doubling down on usability and performance.

Split View Mode Now Default

The most eye-catching addition in Firefox 149 Beta is the split view mode, which is now enabled by default for beta testers. This feature, which has been available in Firefox Nightly over the past month, allows users to divide their browser window into two panes, each capable of displaying a separate webpage or tab. Whether you’re comparing products, referencing documentation while writing, or simply multitasking, split view mode eliminates the need to constantly switch between tabs.

The feature is designed to be intuitive—users can drag tabs between panes, resize the split, and even open links in the opposite pane. Mozilla has clearly taken user feedback from Nightly into account, refining the experience to ensure it’s ready for broader adoption. If the beta period goes smoothly, split view mode is expected to ship in the stable Firefox 149.0 release next month.

Enhanced HTTP/3 Upload Performance

Under the hood, Firefox 149 Beta brings significant improvements to HTTP/3 upload performance, especially on unstable network connections. HTTP/3, the latest version of the HTTP protocol, is designed to make web browsing faster and more reliable by using the QUIC transport protocol. However, upload performance on shaky connections has been a sticking point—until now. Mozilla has bolstered the robustness of upload performance, which should mean fewer interruptions and faster uploads, even when your connection isn’t at its best.

New Reporting API

Another technical highlight is the introduction of a new Reporting API. This allows websites to send structured reports about various events (like content blocking or policy violations) directly to a specified endpoint. For developers and site administrators, this means better visibility into how their sites are being used and any issues that may arise, ultimately leading to a smoother and more secure browsing experience for end users.

What’s Next?

With Firefox 149 now in beta, Mozilla is inviting users and developers to test these new features and provide feedback. The company is particularly keen to hear about the split view mode’s stability and usability, as well as any improvements in network performance. If all goes well, the stable release is just around the corner, bringing these enhancements to millions of Firefox users worldwide.

For those eager to try out the latest and greatest, Firefox 149 Beta is available for download on Firefox.com. As always, beta software may have some rough edges, so it’s best suited for those who don’t mind the occasional bug in exchange for early access to new features.

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