There's a new feature inside Firefox that allows you to report webpages that are broken on Firefox but work in other browsers. Please use it. It's a great way to push for universal compatibility within browsers. It's usually the webpage developer's fault for using a non-orthodox technique that works exclusively on Chrome, but shouldn't be done for any sort of reasons, like compliance with web standards. But, it's possible for Firefox to derive intelligence from the reports and write workarounds.