This is driving me crazy. Every YouTube vid moves inside the window like someone behind the camera is shaking it violently. The motion distorts into mosaic-like pixelation. I have noticed that this happens only when there is actual motion in the video.
For example, if someone is moving. If there is a still shot of the person, or if just a bunch of text is shown, no stuttering occurs.
And, if I move my cursor constantly inside the vid while it plays, the stuttering stops, but I can't continuously do that!
We're talking about a Windows 7 Fujitsu on Firefox with the latest updates. It's on a university server in Japan, hardwire connected, not wifi.
A wifi connected Panasonic laptop with Windows 8 shows none of this.