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Re-enabled non-Flash plugins temporarily and improved text input for third-party keyboards.

Downloading and using old versions of Firefox is on the modern web. These versions: Legacy Add-on Support on Firefox ESR - The Mozilla Blog Download Firefox 12-51 52 Esr

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

The "Rapid Release" era characterized by the steady introduction of HTML5 features and the classic extension ecosystem. Download Firefox 12-51 52 Esr

Understanding the Legacy: Firefox Versions 12–51 and 52 ESR