Waterfox lists all the ways they receive information about their users here [0]. The list has a length of 1:

>> We learn information about you when you give it to us directly (e.g., when you choose to send us crash reports)

[0] https://www.waterfox.net/privacy/

Mozilla, say hello to my new little default browser friend.

Worth noting that Waterfox was acquired by System1, an advertising company. While I've seen no evidence that this has affected the browser itself yet, I'd be a bit concerned about the incentives this creates.

https://system1.com/press/system1-welcomes-waterfox

Yeah. Also I don't think most Firefox forks take security seriously. Jumping like this is like jumping into a house on fire because your finger got burned.