In the directory, you will see a list of folders. Look for:
Before downloading a legacy version, match the release window with your target operating system to avoid installation failures. Firefox Version Range Released Era Compatible Operating Systems Key Architectural Focus 2012 – 2013 Windows XP/Vista/7, Mac OS X 10.5+ Rapid release stability, memory reduction Firefox 19 – 47 2013 – 2016 Windows XP SP2+, Mac OS X 10.9+, Linux HTML5 video integration, Australis UI Firefox 48 – 51 2016 – 2017 Windows 7+, Mac OS X 10.9+ (Dropped XP/Vista) Multi-process (e10s) deployment Firefox 52 ESR 2017 – 2018 Windows XP/Vista/7/8/10, Mac OS X 10.9+ Final plugin support, Enterprise stability How to Safely Download Legacy Firefox Versions Download Firefox 12-51 52 Esr
Firefox 52.9.0 ESR stands as the absolute final version of Firefox to support Windows XP and Windows Vista. After this release, the browser engine required operating system libraries only present in Windows 7 and newer. Technical Specifications & System Compatibility In the directory, you will see a list of folders
Select your language (e.g., en-US ). Download the installer file ending in .exe (for Windows) or .dmg (for Mac). After this release, the browser engine required operating
: Versions like Firefox 12 are among the last to support Windows XP and Server 2003. ⚠️ Important Warnings