Works out of the box, but you may get a "We don't support older versions" nag from some websites. Spoof User Agent:
Note: Waterfox continues today as a modern, updated browser. The "Classic" line ended maintenance in 2022. It is not recommended for secure, daily web browsing. waterfox browser old version
Not all old Waterfox versions are created equal. The developer has bifurcated the project into two distinct tracks. Here is the breakdown: Works out of the box, but you may
However, using Waterfox Classic or any pre-2022 build today is like driving a classic 1967 Mustang on a modern highway. It looks beautiful, feels incredible, but lacks airbags, ABS brakes, and crumple zones. It is not recommended for secure, daily web browsing
Even if legacy add-ons work, try to use (version 1.16.4.30 is the last compatible with Waterfox 56). This blocks malicious domains.