Prevent assets from loading if they did not explicitly opt-in.
COEP is enabled with a single HTTP Response Header, requiring only a single line of code or config.
There is a safe test mode for COEP, meaning you can gather feedback about the impact on your site without any risk.
Cross-Origin Embedder Policy allows you to ensure that all assets loading on your site have explicitly opted-in to being loaded.
COEP can be used to achieve that worthwhile goal, or as part of a broader effort to enable Cross-Origin Read Blocking.
Alongside deploying Cross-Origin Embedder Policy, you should also consider Cross-Origin Opener Policy.