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
: It remains the only official mechanism for running legacy NPAPI plugins, such as the Java Plugin from Oracle, which are no longer supported in modern browsers. System Requirements firefox version 52.9. 0 esr download
(Note: These are legacy FTP paths. You may need to type them into your browser address bar directly.) Firefox version (Extended Support Release) is primarily used
This version is historically significant because it was the before Mozilla pushed its sweeping "WebExtensions-only" policy (Firefox 57+, codenamed "Quantum"). It was also the final version of Firefox to support older operating systems , including: firefox version 52.9. 0 esr download