I have a 20" monitor attached to my netbook, and have it set up in system/preferences/monitors so I do not have the same image in both monitors. This lets me move the mouse back and forth between the attached monitor to the netbook monitor, and have different stuff on the two screens. However, I have some odd behavior I don't understand.
When I open firefox on the attached 20" monitor, it pops onto the netbook screen, either when I first open it, or when I first click a link on the home page. I can then go to the netbook screen, right click the monitor and select "unmaximize", and it returns to the attached screen. I can then maximize it and it stays on the attached screen.
What causes this and how can it be corrected?