I've had an issue with Firefox that I've noticed only since I updated to Firefox 55. I've noticed that when a video is played at 360p (whether it's on YouTube, Vimeo, or wherever), the color becomes completely distorted and a large vertical green bar appears in the center-left part of the video. I change a lot of the internal settings in Firefox to personalize it, but I've never experienced this issue. I decided I would look into it and try to troubleshoot it myself before coming here, and here's what I've gathered so far: 1. This does not occur on any other browser, nor does it occur on any other quality setting (e.g. 480p). 2. The issue is not caused by any of my add-ons, as I've disabled all of them and it still happens whenever I set the quality of a video to 360p. 3. The only thing that has successfully prevented the issue is Safe Mode, but I have no idea what it is about Safe Mode that causes the video to go back to normal. 4. I've refreshed Firefox about 3 times, and each time, I tested it before and after I restored my add-ons and settings, and it worked fine, but the next time I would start Firefox, it would start occurring again. I've basically come here as a last resort. I believe it's one of my settings that causes this, but I have no idea which one. I've tried reversing a bunch of them to see what was causing it, but with no permanent solutions. Any ideas?