Same. I tried LibreWolf for a while but as TA mentioned, it required too much tuning. (It also isn't signed on macOS so installing has extra hoops.) I'm on Waterfox now and it's just about right for me.
https://www.waterfox.com/support/how-do-i-set-sync-my-comput...
Also, no, the page is not "sparse" on how it differs from Firefox, it's clearly explained https://www.waterfox.com/#why-waterfox