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Privacy PolicyDownloading and using old versions of Firefox is on the modern web. These versions: Legacy Add-on Support on Firefox ESR - The Mozilla Blog
The long-term support version that became a "safe haven" for users needing legacy compatibility until late 2018. Important Security Warning Download Firefox 12-51 52 Esr
: Firefox 52 ESR was the final version to support classic "legacy" extensions ( XUL-based ). Many beloved power-user tools like Classic Theme Restorer or DownThemAll! (in its original form) only function on these older builds. Operating System Compatibility : Downloading and using old versions of Firefox is