Then use via package.json scripts or by invoking agent-browser directly.
.header{background:var(--color-background-secondary);border:0.5px solid var(--color-border-tertiary);border-radius:var(--border-radius-lg);padding:1.5rem;margin ...
javascript:(()=>{const box=document.createElement("div");box.style="position:fixed;z-index:999999;inset:0;background:#101114;color:white;font:bold 22px sans-serif ...