I posted about this a while back, but it went ignored. I'm trying to try posting again as the problems still happens with FF 3.5.1 and I have a picture of the glitched video. To explain the problem: Whenever I try and watch a Quicktime video in Firefox, the video starts to lag and then starts glitching. One second it will be ok then the next it will be artifacting and the colors will go nuts. I've attached a screenshot to show you guys what I'm talking about. I have tried re-installing quicktime, re-installing firefox, and even removing the quicktime plugin from FF. Nothing seems to work. I cannot reproduce this problem with Safari 4.0 or Camino, so I have no idea what is going on. I'm trying to find out if anyone else has run into this issue, and if so, how where they able to fix it. I'm trying to get help here before I sending an email to Mozilla about the problem and filling out a bug report. If anyone can help me out I would appreciate it. Its starting to bug me that I cannot find a solution to this.