Title bar / full screen in 23.04 #fullscreen #titlebar

https://askubuntu.com/q/1464849/612

Hide application title bar in Ubuntu 22.04 #gnome #2204 #titlebar

https://askubuntu.com/q/1456887/612

@Corben78
Putting this into your userChrome.css should put your tabs below the URL and bookmark bars:

#navigator-toolbox {
display: flex;
flex-direction: column;
}

#titlebar {
order: 5;
}

Obviously no guarantees that this won't break in the future, won't break anything about Firefox or that it's compatible with CustomCSSforFx.