It seems to me that Mozilla has made a decision to prevent XP and Vista users from downloading the latest offline installer from just to accommodate a small number of 32-bit users who do not keep their OS patched. XP and Vista users wanting to do an over-the-top update will now be forced to download their installers from third-party sites like FileHippo or go to the download archive at and drill down through multiple folders until they (hopefully) find the correct installer for their region and bitness.Īccording to the support article How can I get the latest version of Firefox on Windows XP or Vista? fully patched XP SP3 and Vista SP2 users should be able to run the latest SHA-256 signed installers (assuming Vista users have not hidden the recommended KB2763674 during a Windows Update). Running the internal updater with my browser open (Help | About Firefox | Check for updates) occasionally corrupts my Firefox profile so it's much safer for me download the latest offline installer and perform an over-the-top update with my browser closed. I wanted the full v43.0.4 installer to perform an over-the-top update from v43.0.3 to v43.0.4 so downloading an old v43.0.1 installer from is of no use to me. Otherwise Mozilla would likely fine tune what to serve as in 43.0.1 for SP2 and 43.0.4 for SP3.

For WinXP users for example the browser useragents on WinXP does not show if user is using SP2 or SP3 for example.

Mozilla firefox 43.0.4 download