Firefox 140 Arrives With ESR Status

Longtime Slashdot reader williamyf writes: Firefox 140 just landed. Some user-facing features include: Vertical Tabs: You can now keep more -- or fewer -- pinned tabs in view for quicker access to important windows. Just drag the divider to resize your pinned tabs section. Unload Tabs: You can now unload tabs by right-clicking on a tab (or multiple selected tabs) and selecting "Unload Tab." This can speed up performance by reducing Firefox's memory and CPU usage. But the most important feature? This release is an Extended Support Release (ESR). Why are ESRs so important? ESR is the Firefox version that ships as the default with many Linux distributions. Some downstream projects (like Waterfox) depend on the ESR version. Many enterprise software systems are tested only against ESR. When features are dropped -- like support for older operating systems or Flash -- ESR keeps that functionality around for longer. And speaking of old operating systems: If you are using Windows 7, 8.1, or macOS 10.12~10.15, note that FireFox ESR 115 (the last version supporting these OSs) will continue to receive patches until at least September 2025. So one can see why ESR is very important for some people. The release notes are available here. Read more of this story at Slashdot.

Jun 25, 2025 - 08:00

Longtime Slashdot reader williamyf writes: Firefox 140 just landed. Some user-facing features include: Vertical Tabs: You can now keep more -- or fewer -- pinned tabs in view for quicker access to important windows. Just drag the divider to resize your pinned tabs section. Unload Tabs: You can now unload tabs by right-clicking on a tab (or multiple selected tabs) and selecting "Unload Tab." This can speed up performance by reducing Firefox's memory and CPU usage. But the most important feature? This release is an Extended Support Release (ESR). Why are ESRs so important? ESR is the Firefox version that ships as the default with many Linux distributions. Some downstream projects (like Waterfox) depend on the ESR version. Many enterprise software systems are tested only against ESR. When features are dropped -- like support for older operating systems or Flash -- ESR keeps that functionality around for longer. And speaking of old operating systems: If you are using Windows 7, 8.1, or macOS 10.12~10.15, note that FireFox ESR 115 (the last version supporting these OSs) will continue to receive patches until at least September 2025. So one can see why ESR is very important for some people. The release notes are available here.