OMG it actually works LOL.
I was wondering if add-on like that could exist because blocking element with adblockers didnt work very well and would sometimes only work on one video but not the other.

This one removed that garbage right away. awesome

This greatly improves Amazon's Prime streaming service which, uncorrected, draws garbage text and UI elements on the screen any time the cursor enters the streaming window and takes several seconds to clear once the cursor leaves the window. This extension corrects the issue. Perfection.

Works