Black box blocks part of screen (win10 firefox web player)

[Annnoyeduserr]

Plan

Free

Country

Device

Lenovo ideapad

Operating System

Windows 10, Firefox

My Question or Issue

This is my screen (see attachment). Been like this for a year now, already posted about this. No add-ons or anything activated. Deleting the HTML <div> gets rid of it, however I see a page saying I need to reload the page after a few minutes