It is not possible to move firefox when right-click and selecting move in Windows
after updating to ff 4.0 it is not possible to move firefox when rightclicking the mouse and selection move option in windows. this was possible in previous versions.
Alla svar (2)
It's not really necessary to do that even: just press and hold down the left mouse button on the title bar and move the browser to wherever you want.
It really is necessary if the window is on a different display which you can't see. I have an HDTV as a secondary display and unless it is switched on with the correct input selected, I can't see the title bar to click on it.
A workaround is to enable the Menu Bar via Firefox->Options->Menu Bar, which brings back the traditional Windows title bar. With Menu Bar enabled the move function is restored.