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After downloading 4.0.1, I cannot open a new window using 'cmd-N' if the current active Firefox window is on an attached display. It works if the current Firefox window is on my primary display.

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MacBook, Mac OS X, 10.5.8. The problem only occurs if my primary display (has the toolbar) is a second attached monitor, and I am trying to open new windows on my laptop monitor. If my laptop has the toolbar, I am able to open new windows in both displays (no problem).