Did you try calling the window menu by keyboard with holding the -key and then pressing the bar, also? For this to work your Firefox window needs to be active.
To minimize a window by keyboard you could also hold the -key and then press .
Did you try calling the window menu by keyboard with holding the -key and then pressing the bar, also? For this to work your Firefox window needs to be active.
To minimize a window by keyboard you could also hold the -key and then press .