there is no persistent menu bar across the top to hide all your features
There used to be. Is that gone? I wouldn't know - I stay as far away from MacOS as I do from GNOME, and for the same reason: if you want to do anything which even slightly deviates from what the UI designers planned for you to do (like enabling tracking protection) then you either know the secret handshake or you're out of luck.
Actually, the thing which has irritated me the most about Firefox lately is the lack of configurability of shortcuts. Ctrl-w closes a tab while Ctrl-q quits the program... right next to one another. Every time I hit Ctrl-q by mistake I get angry and look for the menu option which lets me configure shortcuts, only to smack myself in the head and remember that it isn't there. The secret handshake for that one used to be a plug-in, but that doesn't work with current versions of Firefox. As annoying as the hamburger menu might be, I would be fine with it if it just had the options there for all of this stuff. You should never need to use the about:config tool if you're not a Firefox dev.
I think there's a world market for about five computers. -- attr. Thomas J. Watson (Chairman of the Board, IBM), 1943