Download [best] Firefox 12-51 52 Esr
using older versions of Firefox for daily browsing because they lack modern security patches. If you need an older version for a specific legacy tool, it is safest to use a Portable Edition that runs separately from your main browser. Mozilla Support Mozilla Firefox ESR, Portable Edition like Java, or to use on an older operating system
– they have unpatched critical security vulnerabilities . Use them only for: Download Firefox 12-51 52 Esr
: It was the last version to support legacy plugins like Java, Silverlight, and Adobe Acrobat (standard Firefox 52 and later dropped support for these). using older versions of Firefox for daily browsing
This is the last version to support Windows XP and Vista and the NPAPI plugins (like Java and Silverlight). Windows (64-bit) Installer Windows (32-bit) Installer Firefox 12 - 51 (Standard Releases): These are accessible through the release index. Index of All Firefox Releases Key Version Features Firefox 52 ESR: Notable for being the last version to support the NPAPI plugin Use them only for: : It was the
There are several reasons why you might need to download an older version of Firefox: