The extension consists of exactly two functional files: declaring a CSS-only content script, and which applies a red border and 'Rickroll' label to anchor tags linking to the specific YouTube rickroll URL (dQw4w9WgXcQ). There is no JavaScript, no network requests, no data collection, and no dynamic code execution whatsoever. The ML score of 0.67 was almost certainly driven by the broad `*://*/*` content_scripts match pattern combined with the Manifest V2 flag — neither of which indicates malice when the injected content is purely cosmetic CSS. The chrome-stats likelihood score of (lowest) corroborates benignity; the publisher reputation flag ( malicious from leave-one-out) is the only meaningful concern, but cannot override the complete absence of any harmful code in this specific extension.