Drop down menu displays in miniature on wrong monitor

I am on 15" MacBook Pro Retina with HDMI to an LCD HD TV. OS X 10.8.2 Firefox 18.0

When I have the Firefox browser on the TV screen, drop down menus appear in miniature on the MacBook screen. I disabled the hardware acceleration and this seemed to work for the first instance of use but then the system reverted to miniature menu on the wrong screen.

Any ideas for curing this gratefully received.

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