I run CF. Based off FF ESR and is rock-solid for me and compatible with FF extensions.
I have Waterfox and Pale Moon installed as well.
I have Opera which changes the ip address for me so I have a free VPN. Until now, Im not sure how I did it.
Is Waterfox abandoned still, or have they made updates? IIRC when I was using it they stopped updates in 2014 or earlier? Then I switched to Palemoon, and recently Opera Mini Portable, and today I am using Brave.