Basically, Waterfox is not as hardocore bonkers about trying to perfect security as like, IronFox, but it strips a bunch of more recent BS out of Firefox, does a good deal of automatic LibreWolf type ecurity oriented tweaks... I don't think its configured to do DoH only by default, but its like 3 or 4 ciicks in the settings menu to do that... and its got more of a focus on usability.

Just recently got an update for like, vertically stacked tabs in a group, or something?

Sounds neat, I haven't futzed with that particular thing yet tho, but it does seem neat.