Downloading the offline installer is a strategic choice for users and organizations that prioritize long-term stability and security over rapid feature updates . Unlike the standard "stub" installer, which requires an active internet connection to pull files during setup, the offline (or standalone) installer contains all necessary components to install the browser on a machine without internet access. How to Download the Firefox ESR Offline Installer
Mozilla provides several official pathways to obtain the full standalone installer for various operating systems. Use Firefox as your enterprise browser download firefox esr offline