Download Firefox 12-51 52 Esr |link| [SIMPLE | 2026]

: Select the folder for your operating system: win32/ for 32-bit Windows. win64/ for 64-bit Windows. linux-x86_64/ for 64-bit Linux.

If you install an older version, Firefox will immediately try to update to the latest version. To stop this: Go to Options (or Preferences ). Navigate to General . Scroll down to Firefox Updates . Download Firefox 12-51 52 Esr

Launch Firefox and navigate to > Advanced > Update . : Select the folder for your operating system:

: If you need to stay on an old version, go to Settings > General > Firefox Updates and select "Check for updates but let you choose to install them" to prevent it from jumping to the latest version. ⚠️ Security Warning Download Firefox 12-51 52 Esr