"Mozilla, the maker of Firefox, had some good news this week for users still clinging to Windows 7 - Firefox ESR 115 support is being extended until March 2026. Firefox 115 was the final supported version of the browser for Windows 7, 8, and 8.1. Although Microsoft has long consigned those operating systems to the dumpster, Mozilla has kept the lights on via the Extended Support Release (ESR) channel, the last major browser maker to do so."
"In July 2023, Mozilla said Firefox 115 ESR would remain supported until September 2024. It was later extended to 2025, and now to March 2026. "This extension gives users more time to transition while ensuring critical security protections remain available," Mozilla said. "We still strongly encourage upgrading to a supported operating system to access the latest Firefox features and maintain long-term stability.""
Mozilla extends Firefox ESR 115 support for Windows 7, 8, and 8.1 until March 2026 to continue providing critical security updates. Firefox 115 is the final supported build for those legacy operating systems, and the ESR channel preserves security fixes after mainstream support ends. Microsoft ended support for Chromium-based Edge in early 2023, and Mozilla previously adjusted ESR timelines from September 2024 to 2025 before the current March 2026 date. The ESR program delivers security updates but not new features, which require both browser and operating system upgrades. Mozilla will also drop 32-bit Linux support around Firefox 144/145, directing affected users to ESR 140 supported until at least September 2026.
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