Old Waterfox is one of the last browsers that can still run legacy Firefox add-ons like DownThemAll!, Classic Theme Restorer, Tab Mix Plus, and even full UI rebuilds.
The developer maintains an archive of releases. This is the recommended source for downloading old versions. waterfox browser old version
Web standards change, and so do hacking techniques. An older browser may not support modern encryption protocols used by banks or email services, or worse, may contain security holes known to hackers that will never be fixed. Old Waterfox is one of the last browsers