Windows Browsers Firefox V143 (2025)
Windows Browsers Firefox V143 (2025)
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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.