The goal:
"Temporarily and quickly remove them."
The fastest way is to run a script in the browser console that removes all such elements:
document.querySelectorAll('.ad-library-item').forEach(el => el.remove()); This immediately removes all 50+ elements and requires no page reload.
Option analysis:
A & B: Preventing load events is unreliable and does not remove already-created DOM nodes.
C: Correct-console code can remove all matching DOM elements instantly.
D: Possible but extremely slow; removing 50+ elements one by one in the inspector is not "quick." Therefore, C is the best answer.
JavaScript Knowledge Reference (text-only)
The browser console can run arbitrary JavaScript that manipulates the DOM.
document.querySelectorAll() returns all matching DOM nodes.
Nodes can be removed using .remove().