Using Comet Browser raises several privacy and security concerns as of late 2025:

Privacy Risks:

• Comet uses hyper-personalized ads, which rely on detailed user profiles that can feel invasive. Its AI features also involve cloud interactions, potentially exposing your data to breaches, especially under strict regulations like GDPRlinkedin.com.
• The browser’s "Privacy Mode" is vague and does not guarantee that sensitive data remains fully secure or local, as some processing still occurs in the cloudcyberprotectllc.com.

Security Vulnerabilities:

• Comet has been found vulnerable to prompt injection attacks, where malicious actors can inject hidden commands through screenshots or weaponized URLs. This could allow attackers to steal sensitive data, access bank accounts, or compromise corporate systemscyberpress.org+2.
• Security researchers have demonstrated that Comet is up to 85% more vulnerable to phishing and web attacks than Chrome, and its agentic AI can be manipulated into performing unintended actionslayerxsecurity.com+1.

Recommendation: If privacy is a priority, consider using more established privacy-focused browsers like Firefox or Brave. Comet’s innovative AI features come with significant privacy and security trade-offs, especially for handling sensitive or confidential informationlinkedin.com+2.

Would you like more details on alternative browsers or specific privacy settings?

Using a browser with an AI extension, such as Mistral in Firefox, generally offers better privacy protections compared to fully AI-integrated browsers like Comet. Here’s why:

Privacy and Security Advantages

• Sandboxing: Traditional browsers like Firefox are designed with strong sandboxing, which isolates web pages and extensions from your system and each other. This limits the potential damage if an extension is compromised.
• Permission Control: Firefox and similar browsers allow you to control the permissions granted to extensions (e.g., access to specific websites, tabs, or data). You can review and restrict these permissions at any time.
• Open Source and Transparency: Firefox is open-source, meaning its code is publicly available for scrutiny, which helps identify and fix privacy or security issues more quickly.

Potential Risks with AI Extensions

• Data Collection: Some AI extensions may still collect data to function (e.g., sending prompts to a cloud server for processing). Always check the extension’s privacy policy to understand what data is collected and how it’s used.
• Third-Party Dependencies: If the AI extension relies on external servers (like Mistral’s API), your data may be processed outside your local environment. Ensure the provider has strong privacy practices and complies with regulations like GDPR.

Best Practices

• Use Trusted Extensions: Stick to well-known, reputable extensions with clear privacy policies.
• Limit Permissions: Only grant the minimum permissions necessary for the extension to work.
• Regular Updates: Keep your browser and extensions updated to protect against vulnerabilities.

Summary: Using an AI extension in Firefox is generally safer than an AI-native browser like Comet, but always review the extension’s privacy policy and permissions to minimize risks.

Would you like help finding or reviewing a specific AI extension?