I was using a pretty standard line of JavaScript code to set dimentions of an HTML element, something like:
oDiv.style.height = iWindowHeight/2 - 50;
It was working fine in IE, but had no effect whatsoever in Firefox.
Turned out all that was needed – to add ‘px’ to that line:
oDiv.style.height = iWindowHeight/2 - 50 + 'px';
and it works fine in both browsers.