Most browsers today limit the length of the popup to 10-20 items. But the JavaFX WebView uses all vertical screen real estate available (even going outside of the current window frame).

There are a few acceptable solutions:
The default max length needs to be made somewhere in the 10-20 range.
An API needs to be provided for specifying the max number of items to display.

Additionally, it would be nice to have a scrollbar for the popup instead of the existing (clumsy) up and down arrow items.

My customer has complained about this issue and wants us to provide a fix in the next few months. This appears to be impossible atm without changes to JavaFX.

Here is a screenshot of the giant popup menu reaching almost 1000 pixels: http://imgur.com/jPPdHiq