If you are on , you should use Firefox 115 ESR , which will receive security updates until at least August 2026.
: Click the .exe (Windows), .dmg (Mac), or .tar.bz2 (Linux) file to begin the download.
Mozilla maintains an official archive (FTP) of every version ever released. Do not use third-party sites , as they may bundle malware with the installer. Official Archive: You can find all versions (12–51 and 52 ESR) in the Mozilla FTP Releases directory Direct Link for 52.9.0 ESR: Windows 32-bit Windows 64-bit Support Mozilla 3. Installation & Safety Precautions Using these versions today carries significant security risks
: This is the final version that supports Windows XP and Windows Vista. You can find it in the /52.9.0esr/ directory.
Whether you are maintaining an legacy intranet application, running an old operating system (Windows XP/Vista/7), or testing cross-version compatibility, this guide will walk you through everything you need to know about finding, downloading, and safely installing these archaic versions of Firefox.
If you are on , you should use Firefox 115 ESR , which will receive security updates until at least August 2026.
: Click the .exe (Windows), .dmg (Mac), or .tar.bz2 (Linux) file to begin the download.
Mozilla maintains an official archive (FTP) of every version ever released. Do not use third-party sites , as they may bundle malware with the installer. Official Archive: You can find all versions (12–51 and 52 ESR) in the Mozilla FTP Releases directory Direct Link for 52.9.0 ESR: Windows 32-bit Windows 64-bit Support Mozilla 3. Installation & Safety Precautions Using these versions today carries significant security risks
: This is the final version that supports Windows XP and Windows Vista. You can find it in the /52.9.0esr/ directory.
Whether you are maintaining an legacy intranet application, running an old operating system (Windows XP/Vista/7), or testing cross-version compatibility, this guide will walk you through everything you need to know about finding, downloading, and safely installing these archaic versions of Firefox.
