Before installing Firefox 52.9.0 ESR, ensure your system meets the minimum requirements:
Firefox version (Extended Support Release) is primarily used as the final version compatible with legacy operating systems like Windows XP and Windows Vista . Official Download Sources firefox version 52.9. 0 esr download
Enter the folder for your language (e.g., en-US/ for English). Before installing Firefox 52
that were removed in later "Quantum" versions of Firefox (v57+). Before installing Firefox 52.9.0 ESR