No official portable exists. However, PortableApps.com maintains Firefox 3.6.28 Portable. Search for "Firefox 3.6 Portable Legacy."
If you are specifically looking for a "3.2" version, it is likely you are referring to the very old Firefox 3.0 series (released circa 2008) or perhaps a specific legacy mobile variant. However, for most users, downloading the latest version is critical for security and performance. mozilla firefox 3.2 download latest version
Firefox 3.6 will crash immediately on Windows 10 due to missing DLL dependencies (like api-ms-win-crt-private-l1-1-0.dll ). If you attempt to run it, use Windows XP Mode (Virtual Machine) or Wine on Linux. No official portable exists
If you were looking for version 32, it was a major update in 2014 that introduced several foundational features : : Improved performance and crash recovery. However, for most users, downloading the latest version
: Enhanced security against forged certificates.
Web developers sometimes need to test how a site renders on older "Gecko" layout engines (the engine Firefox used before "Quantum"). This ensures backward compatibility or helps diagnose layout bugs that persist in old user bases.