Personally I'm not able to duplicate this issue in FF 3.5x Just to be clear, the issue occurs when you quickly move the mouse from the seach box at the very top to the content below the menu bar, whereby the menu bar is in between? If I move the mouse very quickly, the drop down never appears. If I move it just slowly enough, it does, but disappears as I move the mouse out of the drop down.
What kind of PC are you using speed wise? Try disabling the fading effect inside the .js file:
Code:
effects: {delayhide: 200, shadow:{enabled:true, opacity:0.3, depth: [5, 5]}, fade:{enabled:false, duration:500}}, //customize menu effects
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