Agent Browser Shield
UnclaimedEnhance AI agent browsing with security, efficiency, and accuracy rules.
Visit WebsiteFreemiumVisit Website
Tracked since2026
0 reviews trackedThe Bottom Line
Entry price
Free plan available, paid tiers above
Biggest pro
Significantly reduces token consumption for AI agents.
Biggest con
Currently an alpha prototype, rulesets may change without notice.
TL;DR - Agent Browser Shield
- Optimizes web content for AI agents by removing clutter.
- Enhances security by masking sensitive data and blocking prompt injections.
- Improves AI accuracy by eliminating distracting and manipulative elements.
Pricing: Free plan available
Best for: Growing teams
What is Agent Browser Shield?
Agent Browser Shield is a Chromium extension designed to optimize and secure the use of AI agents during web browsing. It implements over 30 rules to preprocess web content, ensuring AI agents interact with clean, relevant, and safe information. This includes stripping away page clutter like footers, cookie banners, and sponsored content to improve token efficiency, allowing agents to focus on core tasks without wasting resources on irrelevant data.
The extension also prioritizes security and compliance by masking personally identifiable information (PII) and credentials before they reach the AI model. It suppresses hidden text, HTML comments, and user-generated content that could potentially carry prompt-injection payloads, safeguarding against malicious inputs. Furthermore, Agent Browser Shield enhances accuracy by blocking manipulative dark patterns and hiding engagement rails, preventing the AI model from being distracted or misled, thereby ensuring more precise task execution. It is ideal for developers and organizations deploying agentic AI systems that browse the web, providing a crucial layer of control and protection.
Pros & Cons
Pros
- Significantly reduces token consumption for AI agents.
- Provides robust protection against data leaks and prompt injection attacks.
- Improves the reliability and focus of AI agents by removing distractions.
- Open-source and customizable for specific agent needs.
Cons
- Currently an alpha prototype, rulesets may change without notice.
- Requires technical knowledge for installation and customization beyond basic use.
- Limited to Chromium-based browsers.
Key Features
Token efficiency rules (strips page chrome, footers, cookie banners, chat widgets, sponsored content)Security and compliance rules (masks PII, credentials, suppresses hidden text, HTML comments, user-generated content)Accuracy rules (blocks dark patterns, hides engagement rails)Chromium extension for Chrome, Edge, Brave, Arc, OperaInstallable as an unpacked extension or ZIP for agent runtimesConfigurable default rulesetsFloating on-page button to open options pageUnit tests for rules
Pricing Plans
Free TrialFree
$0 USD per month
- Unlimited public/private repositories
- Dependabot security and version updates
- 2,000 CI/CD minutes/month (Free for public repositories)
- 500MB of Packages storage (Free for public repositories)
- Issues & Projects
- Community support
Team
$4 USD per user/month
- Everything included in Free
- Access to GitHub Codespaces
- Repository rules
- Multiple reviewers in pull requests
- Draft pull requests
- Code owners
- Required reviewers
- Pages and Wikis
Enterprise
Starting at $21 USD per user/month
- Everything included in Team
- Data residency
- Enterprise Managed Users
- User provisioning through SCIM
- Enterprise Account to centrally manage multiple organizations
- Environment protection rules
- Repository rules
- Audit Log API
Reviews
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Agent Browser Shield FAQ
What types of content does Agent Browser Shield remove to improve token efficiency for AI agents?
Agent Browser Shield removes various types of page chrome, including footers, cookie banners, chat widgets, and sponsored content, to ensure AI agents only process relevant information and optimize token usage.
How does the extension protect against prompt injection attacks?
The extension protects against prompt injection attacks by suppressing hidden text, HTML comments, and user-generated content that could potentially contain malicious payloads, preventing them from reaching the AI model.
Can I customize which rules are active by default when building the extension?
Yes, you can customize the default active rules by passing an override file to the build command. This file is a flat JSON object where keys are rule IDs, allowing you to specify a custom set of rules without forking the repository.
What are the prerequisites for developing or building the Agent Browser Shield extension?
To develop or build the extension, you need Node.js version 24 or higher, Bun version 1.3 or higher for the extension and demo site, and uv for running Python scripts. The extension itself requires Chrome or Chromium version 148+.
Is there a way to test the effectiveness of the rules without deploying the extension to a live agent?
Yes, the project includes a live demo site called RiverMart, which is a mock e-commerce SPA designed to exercise every rule. You can load this site with and without the extension to observe the before/after differences and verify rule effectiveness.
How does Agent Browser Shield ensure that ad-blocking rules remain effective over time?
The
ads-hide rule bundles a snapshot of EasyList's generic element-hiding selectors. To ensure effectiveness as ad-network selectors change, developers can refresh this snapshot using a provided script (bun run fetch-easylist).Source: github.com