Several weeks ago, Mozilla updated its support documentation to warn those still using pre-Windows 10 versions and certain old macOS releases that Firefox 115 ESR would be out of support by the end of February 2026. However, Mozilla still cannot make up its mind on when to pull the plug on version 115, as it just updated the document once again.
Mozilla has been postponing the end of support for Firefox 115 ESR several times now, and after 18 months of additional support, the browser is getting six more. This time, Mozilla aims for August 2026, which means users on Windows 7 can continue receiving security updates for Firefox 115 ESR, which is the only mainstream browser still supported on Windows 7, 8, and 8.1.
Like before, Mozilla says that its decision is driven by the fact that there are still plenty of Firefox users on Windows 7 and other unsupported operating systems who need a browser with regular security updates. Interestingly, Mozilla's latest message suggests that August 2026 might not be the end of it:
Mozilla will provide security updates for Firefox 115 ESR until the end of August 2026. It was previously announced that support would end in February 2026, but in order to ensure our users can continue to browse the web, we will extend support another six months and re-evaluate. After that, if support is not extended, users should upgrade their operating system to continue receiving Firefox security and feature updates.
Firefox 115 ESR is the last browser release to support Windows 7, 8, 8.1, and macOS 10.12-10.14. Those on Windows 10 and up or macOS 10.15 Catalina and up can use the latest Firefox 148 release, which was released in February, and later received a bug-fixing update as version 148.0.2.
You can read more about Firefox 115 ESR support in the updated support document here.
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