Pashe(!!tKlE5XtNKE|!!uRWgHtAfbA)

That could be from using the scroll wheel over a webm. If that's not it, try going into Options > 8chanX > Clear 8chanX settings.

Did you try with 8chanX disabled completely?

Looks like something in 8chan's JS. I don't like messing with that stuff. Maybe make a thread on /operate/?