Alt+Shift+Click to remove element from page, Alt+Shift+RightArrow to FastForward playing video.
Alt+Shift+Click = Remove given element
For All currently playing videos:
Alt+Shift+Right = FastForward (Ads?)
Alt+Shift+Up = speed up by 10%
Alt+Shift+Down = slow down by 10%
Alt+Shift+Left = default playback rate