If you are downgrading to use old extensions (XUL), be aware that the modern web has moved on. Old extensions may leak data or function poorly on modern HTTPS-encrypted sites.
: Earlier iterations of the modern "current" branch. G3 was notably based on Firefox 78 and began supporting Chrome and Opera extensions. waterfox browser old version
Regardless of the version, Waterfox emphasizes several core "solid" content principles: Waterfox - Open source web browser If you are downgrading to use old extensions
Waterfox 56.2.14 (2019) or Waterfox 2019.10 (the final pre-Classic branding release). waterfox browser old version