Found a fix for this. It's an issue that both Firefox and IE seem to have, but not Chrome. It's surprisingly easy to fix, just add ?wmode=transparent to the youtube url. From this: <iframe width="560" height="315" frameborder="0" allowfullscreen="" src="https://www.youtube.com/embed/5z2-ODBw5FA"></iframe> to this: <iframe width="560" height="315" frameborder="0" allowfullscreen="" src="https://www.youtube.com/embed/5z2-ODBw5FA?wmode=transparent"></iframe> Fixes both Firefox and IE, and doesn't break Chrome (from my limited testing).