“For reference, Google Chrome ended support for 32-bit Linux in 2016. So in 2026, Mozilla will have supported 32-bit Linux for ten years longer than Chrome did.”

🔑 Timeline of Support Changes

• October 14, 2025
  • Release of Firefox 144, last version supporting 32-bit Linux.
  • Same day as Windows 10 end of life.
• October 2025 onward
  • Firefox 145 and newer: 64-bit only.
• September 2026
  • End of Firefox ESR 140 support for 32-bit Linux (last security updates).
• June 30, 2028
  • End of Debian 12 LTS, the last Debian release supporting 32-bit.

https://www.ghacks.net/2025/09/10/firefox-to-end-support-for-32-bit-linux-in-2026/