: This version increased the minimum system requirements for Linux, specifically requiring GNU libc 2.17 , libstdc++ 4.8.1 , and GTK+ 3.14 or newer. Developer and Performance Improvements
: For the first time in the ESR channel, Service Workers and the Push API were enabled by default, supporting more modern web applications and offline functionality. firefox esr 78
# Backup old profile cp -r ~/.mozilla/firefox/xxxx.esr78 ~/backup/ : This version increased the minimum system requirements
For system administrators and IT managers, ESR 78 was critical because it aligned with the massive remote work shift caused by the COVID-19 pandemic, offering stability during a time of rapid technological change. Released on June 30, 2020, was a major
Released on June 30, 2020, was a major milestone for Mozilla, particularly tailored for enterprise, educational, and institutional environments. While the regular "Rapid Release" Firefox browser updates every four weeks, the ESR branch is designed to provide long-term stability by maintaining a single, mature version for over a year, with only critical security fixes and point releases.
| Milestone | Date | Significance | | :--- | :--- | :--- | | General Release | 2020-06-30 | Initial fork from Firefox 79 (mainline). | | Final Minor Update | 2021-10-05 | Version 78.15.0esr. | | End-of-Life (EOL) | 2021-11-01 | No more security updates. Upgrade to ESR 91 forced. | | | 2026 | Unsupported / High Risk |