Overview

• Firefox 138 introduces user profiles, allowing users to create separate bookmarks, tabs, and histories for focused browsing and privacy customization.
• Tab groups, previously introduced in Firefox 137, are now globally available, simplifying multi-tab management with drag-and-drop functionality.
• The update patches eleven security vulnerabilities, including four high-risk flaws that could enable remote code execution.
• New UI enhancements include Windows 11–style popups and an address bar weather feature, though the latter is currently limited to the US.
• Updates to Firefox ESR and Tor Browser ensure enterprise and privacy-focused users benefit from the same security fixes as the main release.