I just upgraded to Ubuntu 22.04 and am running FireFox 105.0.2 (64-bit) now. By default, there's no titlebar, which is ok since it leaves more vertical-space to show page content.
But the Menu toolbar is mostly empty space the way I have it set up. Not to mention that a titlebar is mostly empty space as well. Could you please give the option of showing the page-title on the Menu toolbar? It would fit nicely there.
I use a huge number of tabs, so I can't read the titles on them. I mostly look at the icons on the tabs to know what they contain. Also I think this would be useful for Thunderbird as well.