After some kind of glitch with the Trackerball I'm using (otherwise fine), I've lost the title bar in Firefox, and can't get it back reliably.
If I press f11 to toggle full screen/smaller screen, I can get it back for a short while, long enough to click the minimize or close buttons, but when it's restarted, or maximised again, the title bar is not there, or may be there briefly, but slides 'above' the visible operating window.
I've tried updating Firefox and restarting it, and VL itself, all to no avail.
When I previously had a sort of similar problem with ALL windows, I successfully solved it by following instructions from here to enter the command 'xfwm4 --replace' in a terminal. I tried this again, but it had no effect.
Any suggestions welcome.