The official URL structure is: https://archive.mozilla.org/pub/firefox/releases/
Before 2017, Firefox was famous for its powerful "XUL" and "XPCOM" extensions that allowed deep customization of the browser. When Firefox 57 "Quantum" launched, it replaced these with a more limited WebExtensions system. Version 52.9.0 was the last official release that allowed users to keep using their favorite classic extensions, making it a "time capsule" for power users. 3. The Java and NPAPI Bridge Installation and updates | Firefox Help - Mozilla Support firefox version 52.9. 0 esr download
The official URL structure is: https://archive.mozilla.org/pub/firefox/releases/
Before 2017, Firefox was famous for its powerful "XUL" and "XPCOM" extensions that allowed deep customization of the browser. When Firefox 57 "Quantum" launched, it replaced these with a more limited WebExtensions system. Version 52.9.0 was the last official release that allowed users to keep using their favorite classic extensions, making it a "time capsule" for power users. 3. The Java and NPAPI Bridge Installation and updates | Firefox Help - Mozilla Support