Some old web-based internal tools or legacy hardware interfaces (like old IP cameras or routers) require older rendering engines to display correctly.
It is best used for accessing local network devices or viewing saved HTML files. firefox 20 portable download
A "portable" version is especially useful because it requires no installation. You can run it directly from a USB stick, cloud folder, or a local directory without touching your system’s registry. Why People Still Download Firefox 20 Portable Some old web-based internal tools or legacy hardware