Firefox 138 launches with improved profile management and security updates

[harlan4096]

Firefox 138 is the latest version of Mozilla's open source browser. It will be released later today, if you are reading this on April 29th, 2025.

It is the third major Firefox release in a row that introduced highly requested features in the browser. Firefox 136 introduced vertical tabs, Firefox 137 tab groups, and Firefox 138, today's release, improved profile management.

As always, Firefox 128.10 ESR and Firefox 115.23 ESR are also released today. These are extended security update releases for Firefox that fix security issues and issues only.

Firefox 138: the major changes

Improved Profile Management



I reviewed an early version of Firefox's profile management in January. Firefox has supported profiles for a long time, but it was not obvious how to use it. Veteran users know the startup parameter -p or that they can manage profiles by loading about:profiles.

The new profiles manager brings Firefox's profile management closer to its Chromium counterparts.

Once enabled, it is available via Menu > Profiles. You can create profiles, switch to a profile, or manage them from the starting point.

Each profile works as a separate data set in Firefox. Any customizations you make, e.g., installing extensions, changing settings, or adding bookmarks, applies only to that profile.

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