Videos on youtube start buffering every time i scroll the video from the point i've scrolled to
When scrolling a video on Youtube, to the point which is already buffered, the video starts to buffer again from the point i have scrolled to. It happens "only" on youtube, i've checked other sites, and there i can jump through buffered video, without loading it again. Also tried Windows Internet explorer, and it works, so its not a Youtube problem.
Try to disable hardware acceleration in Firefox.
You can also try to disable hardware acceleration in the Flash player and disable protected mode in the Flash player
Unfortunately, none of those is a solution.