The digital clock has finally run out for holdouts clinging to the past, forcing a critical decision for millions of PC users worldwide.
Mozilla has confirmed that it will officially terminate security updates for Firefox on Windows 7, 8, and 8.1 by the end of February 2026.
The organization is the last major browser maker that still supports the discontinued Windows operating systems.
Windows 7 support ended in January 2020 officially, but Microsoft introduced Extended Security Updates for business customers. These allowed businesses to extend support for up to three years, for a price.
Windows 8 and 8.1 support ended in January 2023, which is also the month that Windows 7 ESU support ended officially.
While Mozilla continued to support Firefox on Windows 7 after January 2023, Microsoft ended support for its Edge browser in the same month. Google followed a month later, when it released Chrome 109, the last official version of the web browser that supported the two operating systems.
Mozilla has now confirmed that it won’t release new updates for Firefox 115 ESR, the last version to support Windows 7 and 8/8.1, after February 2026.
- Firefox 115 is now the last version supported on Windows 7, 8 and 8.1.
- Updates will be delivered through the ESR channel until the end of February 2026.
The organization recommends that users upgrade the operating system to a supported version to “continue receiving Firefox security and feature updates”.
However, this could be problematic for a number of reasons, at least when upgrades to newer versions of Windows are considered:
- The next direct upgrade is Windows 10. Microsoft has ended support and ESU updates are only provided until October 2026 for Home and Pro editions. Mozilla plans to continue supporting Firefox on Windows 10 though.
- Windows 11 is supported, but it has stricter system requirements. Systems that do not meet the requirements can’t be upgraded as easily, if at all (there are some that can’t be bypassed).
Affected users might consider switching to Linux. It is a daunting task, but things have improved significantly in this regard over the years. Yes, some apps or games are not available directly, others may not run, but the vast majority of apps and games should run on Linux.
Firefox 115 ESR will continue to work after February 2026, but Mozilla won’t release any new updates for the version of the open source browser.













