Did you go to the link I posted? It would be more secure than running FF 52.x at this point. They are doing security updates, but I don't think they finished the patch for the second zero-day yet. They take a little while to apply the patches after Mozilla releases it.

Can I just copy the contents of my profile over to Waterfox?
Yes, you can import the profile from your existing Firefox.

https://www.trishtech.com/2018/09/ho...into-waterfox/