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⇱ Firefox Nightly Enables Split-View Mode Option By Default - Phoronix


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Firefox Nightly Enables Split-View Mode Option By Default

Written by Michael Larabel in Mozilla on 26 January 2026 at 02:18 PM EST. 26 Comments
The latest Firefox Nightly builds have now enabled the Split View mode by default to easily view two web pages at once within a single window.

Firefox Split View is now on by default in the latest Firefox 149 Nightly builds so you can add an existing tab to a split view or multi-select two tabs for the split viewing mode.

👁 Firefox 149 split view mode on Ubuntu Linux


I tried out the latest Firefox Nightly Linux build and indeed the split-view mode is working as advertised.

👁 Firefox split view mode


The Firefox Nightly builds now having split view mode enabled by default was mentioned in today's Firefox Nightly News.

👁 Firefox AI window mode option


That Mozilla blog post also noted the addition of the new browser.aiwindow.enabled configuration option to open a new AI Window. That Firefox AI Window is still in its "extremely early days". The AI chat functionality also requires being signed into a Mozilla Account.

Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via MichaelLarabel.com.