I am doing coursework in Udacity. The site uses youtube for it's video playback. The videos are in the html5 format. I know this because I right click on them and get a message about html5 and not flash. Sometimes when I try to watch a video in firefox, I see the video loading on the progress bar, but it will not play. If I then open chromium, and visit the you tube site and start playing a random video, all of a sudden the video will play in firefox. I'm not sure what's going on here or who is responsible, but in my opinion this is a fairly serious issue. It is the sort of thing that ppl will switch browsers for....