Firefox Esr 78 Page

#!/bin/bash if firefox --version | grep -q "78\.\|78\.0\|78\.1"; then echo "CRITICAL: Firefox ESR 78 detected. Upgrade required." exit 1 fi

Date: April 13, 2026 Subject: End-of-Life (EOL) Software Review Audience: System Administrators, Security Compliance Officers, DevOps Engineers 1. Introduction Firefox Extended Support Release (ESR) 78 was a major version of Mozilla’s browser, released on June 30, 2020 . It served as the foundational browser for thousands of enterprises, educational institutions, and public sector organizations until its official End-of-Life (EOL) on November 1, 2021 (with the final point release, 78.15.0, ending support). firefox esr 78

Immediately inventory all endpoints running Firefox 78.x, isolate any that cannot be upgraded, and enforce a migration to Firefox ESR 128 or a modern Chromium-based alternative. Appendix: Check script for Linux endpoints It served as the foundational browser for thousands