Mozilla has released Firefox 115. This is an Extended Support Release (ESR) version of Firefox, which receives major updates on average every 42 weeks with minor updates such as crash fixes, security fixes and policy updates as needed, but at least every four weeks.
Microsoft ended official support for Windows 7, 8 and 8.1 in January of 2023. Unsupported operating systems receive no security updates and have known exploits. With no official support from Microsoft, maintaining Firefox for obsolete operating systems becomes costly for Mozilla and dangerous for users.
As a consequence, this is the last version of Firefox that users on those operating systems will receive. Users on Windows 7 and Windows 8 will automatically be migrated to the ESR 115 version of Firefox so that they continue to receive important security updates.
Similarly, this is the last major version of Firefox that will support Apple macOS 10.12, 10.13, and 10.14. Users on those operating systems will be migrated to the ESR 115 version of Firefox so that they continue to receive important updates.
As part of the Extended Support Release, Mozilla will be providing critical security updates through the Firefox ESR channel up until the end of ESR version 115, September 2024.