Comment 2 for bug 1464767

Found an example of scrollable Bootstrap dropdowns here:

http://stackoverflow.com/questions/19227496/scrollable-menu-with-bootstrap-3-menu-expanding-its-container-when-it-should-n

Do we want all dropdowns to be scrollable? I'm guessing we should only apply the scroll CSS for non-mobile screens, since the default view is probably more mobile-friendly (needs confirmation).