Johny.: Yup, we've added support for FF V25 -moz- CSS prefixes (it was about -moz-box-sizing) which was dropped due to FF releasing a few versions. It doesn't hurt us much (although the percentage of users covered is pretty low), but really - I think all of you should regularly update your browsers. :)
rtcvb32: Curious... I had gotten my result by changing the CSS by flooring all the odd floating points used, and then lower certain sizing numbers (
20% to 19%, 40% to 39%) globally. Maybe that wasn't the proper answer, but it worked for the duration it was needed.
Changing widths worked for you, because FF below 29 needs -moz- prefix for box-sizing. In simple words, with box-sizing: border-box; you change box model of a element and it have an impact on element width. You could find and replace all box-sizing rules with -moz-box-sizing, that would have been an easy way. Changing web standards and browsers implementing newest CSS rules is the reason of -moz- prefix being dropped in FF 29.
It's completely your choice whether you upgrade your browser or not, but you have to be prepared for some drawbacks of your browser getting outdated (sites to look bad, not supported features, security broken - just check changelog for security fixes). But still it's completely your choice. :)
