_top_ Download Firefox 12-51 52 Esr ⏰ 🌟

This era fully supported traditional XUL/XPCOM extensions before Firefox switched to the WebExtensions API in version 57. Firefox 52 ESR (Extended Support Release)

(The last version before the 52 ESR transition) Why use Firefox 52 ESR? Download Firefox 12-51 52 Esr