I don't know when the option was removed since I hadn't updated Firefox on that machine in some time. Normally it's in the customize menu at the bottom left. I can confirm that the option still exists in 104.0.2 since I also haven't updated Firefox on my main machine (a different Ubuntu-based OS). And unless there's some way in...
A purplish-white FireFox logo over a rainbow backdrop
I think the option might just be disabled, yeah. On lubuntu I was able to right click the title bar and disable decoration. Can't do that on xfce tho and that's the wm my main machine uses. Guess I'll try updating and deal with the consequences later?
Updated Firefox to 115.0.1 on Lubuntu - the option to disable the Title Bar has disappeared ( fedia.io )
I don't know when the option was removed since I hadn't updated Firefox on that machine in some time. Normally it's in the customize menu at the bottom left. I can confirm that the option still exists in 104.0.2 since I also haven't updated Firefox on my main machine (a different Ubuntu-based OS). And unless there's some way in...