Despite its age, this version is frequently downloaded for three primary reasons:
to keep it on v52.9.0. Would you like a step-by-step for those settings? Firefox ESR 52.9.0, See All New Features, Updates and Fixes firefox version 52.9. 0 esr download
It was the final version to support legacy plugins like Silverlight and Java (excluding Adobe Flash), which were being phased out in favor of HTML5. The Quantum Leap: Despite its age, this version is frequently downloaded
Use a modern browser (Firefox ESR 115 or 128 on newer OSes, or a lightweight browser like Mypal on XP). If you absolutely need it for testing legacy internal web apps, run it in an isolated VM without internet access. The Quantum Leap: Use a modern browser (Firefox
The release of Firefox 52.9.0 ESR (Extended Support Release) on June 26, 2018, marked a poignant milestone in the history of web browsing: it was the final version of Firefox to support the Windows XP and Windows Vista operating systems. While modern users view it as a relic, for historians and retro-computing enthusiasts, this specific version represents the "last stand" of the open web on legacy hardware. The Bridge Between Eras
To ensure a safe installation, you should only download this version from the official Mozilla FTP or archive servers. Main Release Directory Index of /pub/firefox/releases/52.9.0esr/ Windows 32-bit (English US) Firefox Setup 52.9.0esr.exe Windows 64-bit (English US) Firefox Setup 52.9.0esr.exe (x64)