Mozilla hasn’t stopped working on improvements for Firefox, and a few weeks ago it started talking about what was coming: tab groups, vertical tabs, a sidebar, and a new profile management system.

Firefox Nightly 131Now, the test builds of the Nightly channel (which aren’t fully stable, but are great for experimenting) already have two of these new features. As Mozilla notes, we already have both the option to enable vertical tabs and a new sidebar in Firefox Nightly 131.

Vertical tabsPeople who open many tabs can have a great ally in this new vertical organization, especially on panoramic monitors, where we enjoy a very wide horizontal resolution.

We could sacrifice some of these pixels for the new sidebar where a large number of tabs could be seen. The alternative until now was to have all these tabs arranged horizontally, but if we had a large number of open tabs, this made it impossible to identify them correctly.

Other browsers already use them. Mozilla is certainly not the first to offer this kind of feature. Microsoft Edge added this functionality a long time ago, and so did Arc, the browser that my colleague Javier Lacort recently described as the best browser in the world.

New sidebarAlong with vertical tabs, the new sidebar lets you “cross-reference your favorite tools” like your mobile tabs, favorite extensions, or bookmarks, keeping the main window always in the foreground.

Currently in testing phase. To try both options, you need to download the latest version of Firefox Nightly, then we can enable these options in Settings -> Firefox Labs. In the options list, we can enable both the sidebar and vertical tabs. The two new features are in the testing phase and will take some time to reach the stable version of Firefox.

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