I just had this happen during normal use (nothing was bringing firefox to the foreground, it was already maximized.)
Since I couldn't focus the firefox window, I also could not unmaximize it, because the window controls are not show on maximized but unfocussed windows.
I just had this happen during normal use (nothing was bringing firefox to the foreground, it was already maximized.)
Since I couldn't focus the firefox window, I also could not unmaximize it, because the window controls are not show on maximized but unfocussed windows.