In Firefox after alpha 13 the menu is fixed and is now on top of flash..
but.. on the left side and right side of the floating menu you can't click on anything (buttons, links etc), I think the layer is stretched across 100% of the window width..
In Safari it has the same problem on the left and right side of the layer and flash objects are still on top..
Here are the zones (in red) where you can't click anything..
In Opera the menu is not visible at all, I only see the layout broken - look at the scrollbars..
In Chrome the menu is not visible..
We really need to test it across every browser and get it work somehow..
Firefox and IE is not enough..