Firefox 18 with Retina MBP has issues with dropdowns

Using Firefox 18 on a 15" Retina Macbook Pro. I have my laptop retina (1440x900) set to the primary and a 24" dell U2412M (1920x1600) set to secondary. If I have a firefox window open on the external monitor, dropdowns do not show up on the external, but on the primary.

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