I have two iframes side by side (they are in divs). The target pages didn’t fit right into them so i used:
#historyGraph, #realtimeGraph
{
zoom: 0.85;
-moz-transform: scale(0.85);
-moz-transform-origin: 0 0;
}
Everything looks good however there are problems with drop down lists. I can open it with a mouse. It opens up slightly offset to the right and to the bottom and the only way to make a selection is to use keyboard.
Any way of fixing this?
Edit: http://jsfiddle.net/ZBQaf/

This is a known issue. See https://bugzilla.mozilla.org/show_bug.cgi?id=759993 for more info.