Version 52.9.0 serves as the "sunset" patch—closing the book on a long era of compatibility while ensuring that users on the outgoing channel are left with the most secure version possible.
: For users needing to access legacy Flash content after its 2021 EOL, this version remains a primary workaround for running Flash apps . Performance and Use Cases firefox 52.9.0 esr
Firefox 52.9.0 ESR: The Final Stand for Legacy Computing stands as a landmark in the history of web browsing. Released by Mozilla on June 26, 2018 , it serves as the definitive "end of the line" for several foundational eras of computing. As the final version of Firefox to support Windows XP and Windows Vista , it remains a critical tool for enthusiasts, collectors, and industries relying on legacy hardware. The Last Bridge to the Past Version 52
If you are still using Windows XP or Vista, it is strongly recommended that you upgrade to a modern, supported operating system (such as Windows 10, macOS, or a Linux distribution) as soon as possible. No modern browser will support your OS after this point. Released by Mozilla on June 26, 2018 ,
The most notable aspect of this release is what comes after it. Firefox 52.9.0 is the last version of Firefox that will run on Windows XP or Windows Vista.