i am adjusting a parent div to fit clients browser area.
-> in chrome i have used the zoom property which correctly scales all elements inside including combobox
-> And in mozilla, it doesn't scale the 'options of the combobox', it actually lies away.
<div style="transform: scale(0.8);">
<select>
<option>option 1</option>
<option>option 2</option>
<option>option 3</option>
</select>
i found the same issue question here : Here but this only talks about listing issues.
Definitely looks like a bug in firefox. I too was facing similar problem. As a temporary hack I replaced my select boxes with a light weight jQuery plugin called selectric. See - http://jsfiddle.net/19mkxd8g/5/