This post breaks down Amazon’s lawsuit against Perplexity over its Comet AI agentic browser, which browses and transacts on users’ behalf while disguising itself as Chrome. It explains how these browsers work, the security risks they introduce—like prompt injection attacks—and why sites like Amazon demand transparent agent identification.

• Amazon's lawsuit claims Comet disguises itself as Chrome, hiding the AI agent's true identity from Amazon's systems.
• Agentic browsers share the user's actual cookies/passwords/session data, so a compromised AI agent can act with full access as if it were the user.
• Amazon's complaint cites a public report of prompt-injection attacks hijacking embedded AI assistants to steal private data.
• Amazon argues Comet's covert automation bypasses and degrades its personalized shopping features built over years.