Does anyone use any Firefox forks (Waterfox, Librewolf, etc.) as their primary browser for privacy and performance reasons? I know Zen is fairly popular for it'

Does anyone use any Firefox forks (Waterfox, Librewolf, etc.) as their primary browser for privacy and performance reasons? I know Zen is fairly popular for it's UI choices but I am interested to see if any of the other options are actually superior to Firefox.