Windows Browsers Firefox V143 (2025)

Windows Browsers Firefox V143 (2025)


Latest Firefox 143 Updates & Key Dates

  • February 24, 2026: Release of Firefox 148.0 and 140.8.0esr, finalizing the "AI Kill Switch" and fixing drag-and-drop issues for tab groups.

  • January 27, 2026: Launch of Firefox 147.0.2, providing critical security patches and resolving a major regression with ChatGPT rendering.

  • October 3, 2025: Release of Firefox 143.0.4, which improved connection fallback behavior for Google sites on systems with specific third-party security software.

  • September 19, 2025: Update 143.0.1 addressed a high-priority tab crash caused by DLL injection on certain Windows 11 builds.

  • September 16, 2025: Official Stable Release of Firefox 143, debuting Web App support for Windows and the integrated Copilot sidebar.