https://archive.mozilla.org/pub/firefox/releases/
Mozilla Firefox is a popular open-source web browser known for its speed, security, and flexibility. While the latest versions of Firefox are always recommended for optimal performance and security, some users may need to download older versions of the browser for compatibility reasons. In this article, we'll guide you on how to download Firefox 12-51 and 52 ESR. Download Firefox 12-51 52 Esr
Many modern websites will fail to load or will look broken on these older browsers. https://archive