Page Mover by Jialong0209

Pressing key to move page, and you can double the scrolling speed by pressing Shift key.

Hotkeys:
(H, J, K, I) = left, up, down, right
(A, S, W, D) = left, up, down, right
G = go to top
G + Shift = go to bottom
I = up (by slow scrolling speed)
M = down (by slow scrolling speed)

(If it doesn't work, you can give the "Access your data for all websites" permission to make it work.)