For many years, Mozilla has continued to provide Firefox for 32-bit Linux systems long after most other browsers and operating systems ended support. We made this choice because we care deeply about keeping Firefox available to as many people as possible, helping our users extend the life of their hardware and reduce unnecessary obsolescence.
Today, however, 32-bit Linux (on x86) is no longer widely supported by the vast majority of Linux distributions, and maintaining Firefox on this platform has become increasingly difficult and unreliable. To focus our efforts on delivering the best and most modern Firefox, we are ending support for 32-bit x86 Linux with the release of Firefox 144 (or to rephrase, Firefox 145 will not have 32-bit Linux support).
If you are currently using Firefox on a 32-bit x86 Linux system, we strongly encourage you to move to a 64-bit operating system and install the 64-bit version of Firefox, which will continue to be supported and updated.
For users who cannot transition immediately, Firefox ESR 140 will remain available — including 32-bit builds — and will continue to receive security updates until at least September 2026.
[Updated on 2025-09-09 to clarify the affected builds are 32-bit x86]