Firefox 140 Released with Important ESR Features and Updates

Firefox 140 has officially launched with some exciting new features for users, including the introduction of vertical tabs, which allows users to manage more pinned tabs for faster access. Additionally, the ‘Unload Tabs’ feature has been added, enabling users to reduce memory and CPU usage by unloading tabs, which can significantly boost Firefox’s performance. However, the most important aspect of this release is its Extended Support Release (ESR) status. ESR is vital because it is the version of Firefox that many Linux distributions use as the default, and it’s preferred by downstream projects like Waterfox. Enterprises often rely on ESR for testing, and it supports older operating systems and legacy features for a longer period, which is crucial for some users. Specifically, Firefox ESR 115 will continue receiving updates for Windows 7, 8.1, and macOS 10.12-10.15 until September 2025, providing continued support for older systems. The ESR channel’s focus on stability makes it an essential version for a wide range of users, including those who prefer not to immediately adopt the latest features.