Firefox Esr 78 Fix | Best Pick |

When version 78 launched, it brought several modern features to the ESR track that were previously only available in the rapid release versions.

Enhanced deployment options allowed administrators to run Firefox in a dedicated, full-screen mode, ideal for public-facing terminals.

| 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 |

While Firefox Stable was rolling out WebRender (GPU rendering), it was disabled by default in early ESR 78 releases for broader compatibility. Lifecycle: When Did ESR 78 End? firefox esr 78

: Introduced a dedicated Kiosk Mode for restricted public terminals and added support for Client Certificates .

ESR 78 disabled legacy TLS protocols to protect user data, requiring websites to use TLS 1.2 or higher.

: It was the last major release to support OS X 10.9 Mavericks , 10.10 Yosemite , and 10.11 El Capitan . When version 78 launched, it brought several modern

: A centralized hub ( about:protections ) allowed users to track how many data breaches they resolved and monitor saved passwords for exposure.

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 brought updated minimum system requirements. Notably, it was the final major release to support older macOS versions, specifically macOS 10.9, 10.10, and 10.11. | | Final Minor Update | 2021-10-05 | Version 78

/usr/lib/firefox-esr-128/firefox --profile ~/.mozilla/firefox/xxxx.esr78 --allow-downgrade

A dedicated page to view and manage web certificates, improving security transparency. Security Advancements and Changes