[best] Download Firefox 12-51 52 Esr Jun 2026

because they do not contain modern patches for web vulnerabilities. Mozilla Support Disable Auto-Updates: After installing, immediately go to Options/Preferences > General > Firefox Updates and set it to "Check for updates but let you choose to install them" "Never check for updates" to prevent it from jumping to a modern version. Separate Profiles: dedicated profile

Door 52 ESR stands like a lighthouse for organizations and careful users: the Extended Support Release. It does not chase every glittering novelty. Instead, it keeps what must stand — stability, predictable updates, and security patches focused on safety rather than style. For teams that value continuity over the latest flourish, ESR is a steady hand on the tiller. Download Firefox 12-51 52 Esr

Downloading and using old versions of Firefox is on the modern web. These versions: Legacy Add-on Support on Firefox ESR - The Mozilla Blog because they do not contain modern patches for

The official source for these older releases is the Mozilla FTP Archive . It does not chase every glittering novelty

If you only need an older version for a specific feature, consider these safer options: How to switch to FF 52 ESR? | Firefox Support Forum