Download Firefox 12-51 52 Esr Patched -

The historical versions of Firefox Extended Support Release (ESR) you are looking for—specifically around the range—serve as critical milestones for legacy system support and plugin compatibility.

Downloading Legacy Firefox Versions: 12 through 51 and 52 ESR While Mozilla recommends using the latest version of Firefox Download Firefox 12-51 52 Esr

It was the final version of Firefox to support NPAPI plugins like Silverlight, Java, and Adobe Acrobat. The historical versions of Firefox Extended Support Release