Ye browser version works quite well depending on browser + os + gpu. You hit F11 ingame, yes? I guess scrolling up is scuffed because the browser wants to show "press ESC to quit fullscreen."
No worries.
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Yes, I hit F11 but the "press ESC to quit fullscreen" menu messes with it. It's very weird because it only happens sometimes, I'm not really sure when it does it. I guess you just have to scroll up not in the middle of the screen. The only thing I can think of is to increase the distance of how close to the edge it starts scrolling if its running on browser