Answered my own question. Yes, and here’s how:

https://forums.mozillazine.org/viewtopic.php?t=3111191

Can you switch the order of the toolbars, by any chance? Put the menu bar on the top again, followed by the tab bar, then the message toolbar ?

Ditto – I’ve been keeping a central to me git repo for my settings for years. Any new machine I’m on ‘git clone ; ./settings/setup.sh’, then my pull’d .profile does a git pull on login.