Waterfox contains proprietary Google Play libraries, and doesn't include any hardening when compared to standard Firefox on Android. It's a completely different project with a different set of goals than IronFox or Mull.
You would be far better off using standard Firefox over Waterfox, in terms of privacy & security.
They changed some basics from Mull and decided to go other ways.
What basics did we change, and why do you have a problem with them?
IronFox still has the same core goals/mission as Mull: to provide a privacy & security-oriented Firefox-based web browser for Android. If IronFox isn't for you, that's completely fine - but I'm just perplexed by your reasoning here, and would appreciate any elaboration so that we can improve.