Firefox 64-bit from 32-bit on Windows

Note: Linux and Mac users are generally already on 64-bit Firefox.

Windows users until August 2017 were generally running 32-bit Firefox, which is substantially less secure and more prone to crash than 64-bit Firefox.

Upgrade to 64-bit

  1. click Download Firefox at This is automatically the new 64-bit Firefox installer for Windows.
  2. Run the downloaded Firefox Installer. It will automatically install 64-bit Firefox, which can be verified from Firefox Help > About menu.
  3. Uninstall 32-bit Firefox by going to “Add and Remove Programs” and removing the “x86” Firefox
Firefox 64-bit version screen

Firefox 64-bit version screen.

Firefox add remove programs

Remove 32-bit Firefox **x86**.