Youtube only shows the Youtube logo and search bar at the top. The solutions I found in your help section only worked temporarily. If I go into my browsing History by pressing <Ctrl> <Alt> H, right-clicking youtube to forget the site, and reloading the page, then videos will play until I sign back into my Youtube account. If I sign in while a video is playing, all the links will reload, and the video will continue playing but all the links except the Youtube header will be unresponsive. Chrome seems to be working fine for youtube right now but I prefer firefox as my main browser.