For months now when on YouTube, on random videos, the video will hang right after they start playing, but the sound continues to play fine. I can play the same video on IE, Edge, etc, and they work fine. I was on an older version of Firefox, so I finally updated, hoping that this was the problem, but it's still doing it. I have been doing some troubleshooting, and have found that the videos play fine in Firefox if I run it in safe mode. I have just done a refresh on the browser, and have no addons installed except for the 2 default codec's required to play video, yet it is still hanging unless I am in safe mode. Other than no longer using Firefox, what can I do to fix this?