0 Esr Download _hot_ — Firefox Version 52.9.

Firefox version 52.9.0 ESR is famously the of the browser to support legacy operating systems like Windows XP and Windows Vista . Released in June 2018, it marked the end of an era, serving as a "lifeboat" for users and businesses who couldn't—or wouldn't—upgrade their hardware or OS. The Role of the "Extended Support Release" (ESR)

: It remains the only official mechanism for running legacy NPAPI plugins, such as the Java Plugin from Oracle, which are no longer supported in modern browsers. System Requirements firefox version 52.9. 0 esr download

While outdated now, at its release, 52.9.0 included all security fixes from the preceding 15 months, including patches for critical zero-day vulnerabilities. Firefox version 52